bluuebunny/crossref_metadata_2025 huggingface dataset:
Οικολογική και πληθυσμιακή κατάσταση του ευρωπαϊκού λαγόγυρου (Spermophilus citellus Linnaeus, 1766) στην Ελλάδα
Authors: Ράμμου Δήμητρα-Λήδα
Published: July 2023

Ο ευρωπαϊκός λαγόγυρος είναι ένα κινδυνεύον με εξαφάνιση εδαφόβιο σκιουροειδές τρωκτικό των χορτολιβαδικών οικοσυστημάτων της Ευρώπης. Τις τελευταίες δεκαετίες ο πληθυσμός του παρουσιάζει πτωτική τάση σε όλο το εύρος εξάπλωσης. Οι ελληνικοί πληθυσμοί αντιπροσωπεύουν το νοτιότερο όριο, ενώ η γνώση της κατάστασής τους είναι περιορισμένη. Σκοπός της παρούσας διδακτορικής διατριβής είναι η μελέτη του πληθυσμού, της οικολογίας, της γενετικής και της ηθολογίας του είδους στην Ελλάδα. Από επιτόπιες επισκέψεις μεταξύ 2019-2020 σε Δυτική και Κεντρική Μακεδονία και Θράκη συλλέχθηκαν δεδομένα παρουσίας, βιολογικού ιστού και επαγρύπνησης. Τα δεδομένα αναλύθηκαν με υπολογιστικά μέσα ανάλυσης της πληθυσμιακής πυκνότητας, ομαδοποίησης των ενδιαιτημάτων, μοντέλα μέγιστης εντροπίας κατάλληλων και διαθέσιμων ενδιαιτημάτων, δεικτών γενετικής ποικιλότητας, φυλογενετικών σχέσεων και στατιστικού ελέγχου του λόγου των πιθανοτήτων. Τα αποτελέσματα έδειξαν ότι: (α) οι υφιστάμενες αποικίες είχαν μικρή μέση πυκνότητα και αριθμό ατόμων. Η πλειονότητα των αποικιών εντοπίστηκε σε αγροτικές και τεχνητές επιφάνειες μικρής έκτασης στα πεδινά της Κεντρικής Μακεδονίας και Θράκης. Οι πληθυσμοί της Δυτικής Μακεδονίας ξεχώρισαν λόγω των διαφορετικών τοπογραφικών και κλιματικών συνθηκών· (β) τόσο ανθρωπογενείς όσο και βιοκλιματικοί παράγοντες συνέβαλαν στο πρότυπο εξάπλωσης των πληθυσμών, με τα διαθέσιμα ενδιαιτήματα να είναι ελάχιστα σε σχέση με τα κατάλληλα. Επιπλέον, προβλέφθηκε μείωση της καταλληλότητας των ενδιαιτημάτων κατά 39% – 94,3%, εξαιτίας της κλιματικής αλλαγής της επόμενης 40ετίας· (γ) η γενετική ποικιλότητα των ελληνικών πληθυσμών δε συσχετίστηκε με το γεωγραφικό πλάτος έπειτα από τη σύγκριση με σέρβικους πληθυσμούς. Λαμβάνοντας υπόψη το σύνολο των δειγμάτων από την ευρωπαϊκή εξάπλωση, φάνηκε ότι οι προγενέστεροι πληθυσμοί του είδους βρίσκονταν στη νοτιοανατολική Βουλγαρία και την Ευρωπαϊκή Τουρκία και κατά τη μεταπαγετώδη περίοδο επεκτάθηκαν ταχύτατα προς την Ελλάδα και συγκεκριμένα από τη Θράκη στην Κεντρική και Δυτική Μακεδονία· (δ) τα ενήλικα άτομα ήταν πιο επιφυλακτικά ακολουθώντας διαφορετική στρατηγική επαγρύπνησης ανάλογα με τον κύκλο ζωής και τις συνθήκες της περιοχής, ενώ τα νεαρά διακινδυνεύαν περισσότερο εξαιτίας των υψηλών ενεργειακών αναγκών και της απειρίας. Συμπερασματικά, προτείνονται δράσεις διατήρησης για την προστασία των πληθυσμών του είδους στην Ελλάδα, προσδιορίζοντας τρία in situ κλιματικά καταφύγια που θα μπορούσαν να αποτελέσουν προτεραιότητα για μελλοντικές επανεισαγωγές και βελτίωση των ενδιαιτημάτων.
Política y YouTube: análisis musivisual de las campañas electorales del 28‑A y 10‑N de 2019 en España.
Authors: Rodríguez López Rafael Ángel
Published: July 2023

Durante 2019 en España se dan cita dos convocatorias de Elecciones Generales, una el 28 de abril y otra el 10 de noviembre, donde las distintas formaciones políticas que se presentan a ambos comicios producen un considerable número de spots electorales en YouTube. Por lo tanto, los objetivos en los que se enmarca este estudio son el de identificar, analizar y comparar los elementos musivisuales que tienen lugar en citados archivos audiovisuales con la intención de conocer la manera en la que las múltiples formaciones políticas hacen uso de las diferentes propuestas y formas de comunicación sonoras en YouTube para la difusión del mensaje electoral. Para ello, se ha propuesto un método de análisis musivisual de carácter cualitativo y cuantitativo que profundiza en los elementos musicales empleados para acompañar a la secuencia visual de los spots. Así, mediante este análisis se obtienen una serie de resultados que evidencian cómo citadas formaciones hacen un uso específico y común de algunos parámetros musicales y sonoros, tales como la música preexistente y de procedencia extradiegética, entre otras cuestiones. De manera que este estudio nos ha permitido concluir que las formaciones políticas recurren a la música como una de las principales piezas persuasivas en los spots emitidos en YouTube.
El arco de transformación a través del vestuario y los complementos en la miniserie Gambito de dama.
Authors: García Romero Enrique , Solís Paredes Elia , Agapito Mesta Natalí , Sánchez Tineo Noelia
Published: July 2023

El arco de transformación refleja cómo un personaje evoluciona interiormente a lo largo de una historia. Paralelamente, el vestuario y los complementos del personaje –maquillaje y peinado– también manifiestan su interioridad, de una forma creativa. Este trabajo de investigación ha averiguado qué relación existe entre el arco de transformación, el vestuario y los complementos de Beth Harmon, protagonista de la miniserie Gambito de dama. Se trata de una de las series más vistas de la historia de la plataforma Netflix, y marcó tendencia en la moda occidental. Para alcanzar el objetivo propuesto, se ha realizado un análisis de contenido de los siete capítulos de la miniserie, y se han seleccionado catorce escenas que corresponden a momentos clave de la trama, con el fin de analizar el vestuario y los complementos de la protagonista para averiguar si estos reflejan su arco de transformación. Para el establecimiento de las variables, se han seguido a autores que identifican el significado de los colores y las formas en el vestuario, así como el tipo de complementos. Los resultados muestran que los atuendos de la protagonista ponen de manifiesto un cambio interior en ella, que pasa de actitudes negativas basadas en adicciones y frustraciones, a actitudes positivas de superación y madurez.
Propiedades psicométricas de la escala de experiencias de recuperación en trabajadores dependientes peruanos
Authors: Mamani-Benito Oscar Javier , Cruz Ordinola María Celinda , Llacsa Vásquez Mercedes , Carmona Brenis Karina Paola , Asenjo Zapata Cornelia Yajaira , Bernal Marchena Luisa Paola de los Milagros , Pichen Fernández Juan , Tito-Betancur Madona
Published: July 2023

Objetivo: analizar las propiedades psicométricas de la escala de experiencias de recuperación en trabajadores dependientes (asalariados) peruanos.
Método: estudio transversal donde participaron voluntariamente 462 trabajadores dependientes de ambos sexos, de entre 20 a 66 años de edad, de las tres regiones del Perú. Los participantes fueron reclutados de empresas del sector financiero, turismo, educación, salud y telecomunicaciones. El instrumento objeto de validación fue la escala de experiencias de recuperación validada para profesores peruanos. Se analizó la estructura interna mediante el análisis factorial confirmatorio, la consistencia interna con el coeficiente Alpha de Cronbach y la validez convergente a través del coeficiente de correlación de Pearson.
Resultados: el análisis factorial confirmatorio reportó un ajuste adecuado para la estructura original de cuatro factores (x2= 141.782., p < 0,001, CFI = 0,981, RMSEA = 0,065. y SRMR = 0,035). Las cargas factoriales resultantes se encuentran entre 0,71 y 0,90 y la consistencia interna ? entre 0,81 y 0,92. Con respecto a la validez convergente, se hallaron correlaciones directas y significativas entre las dimensiones de experiencias de recuperación y la escala de bienestar general (r= 0,126 a r=0,287).
Conclusiones: la escala de experiencias de recuperación demuestra validez basada en la estructura interna, fiabilidad y validez convergente, y puede ser aplicada en la gestión de la salud ocupacional para trabajadores dependientes peruanos.
FARnet: Farming Action Recognition From Videos Based on Coordinate Attention and YOLOv7-tiny Network in Aquaculture
Authors: yang xinting , Pan Liang , Wang Dinghong , Zeng Yuhao , Zhu Wentao , Jiao Dongxiang , Sun Zhenlong , Sun Chuanheng , Zhou Chao
Published: July 2023

Highlights

The automatic detection and recognition of farming action in video are realized.

The YOLOv7-tiny was enhanced by incorporating Coordinate Attention (CA).

The performance indices mAP@.5 and mAP@.5:.95 improved by 0.1% and 6.6%, respectively.

An intelligent method for detecting "inspection" and "applying pesticides" is provided.

Abstract. In aquaculture, regular "inspection" and "applying pesticides" are essential to improving production efficiency and fish disease treatment, but the current aquaculture system does not effectively support these strategies. Therefore, this paper proposes a farming action recognition network (FARnet), which can accurately locate the farmers in the video and detect the actions of “applying pesticides” and “inspection.” The dataset was captured and produced by multi-angle cameras, which were consulted with relevant experts. In this network, Coordinate Attention (CA) was used to improve the Efficient Layer Aggregation Networks-tiny (ELAN-tiny) and Spatial Pyramid Pooling (SPP) structures in the YOLOv7-tiny network. The precise implementation methods are as follows: (1) The convolution in ELAN-tiny was replaced with the CA module, and a shortcut was added. (2) A CA module was added to the final layer of the Spatial Pyramid Pooling (SPP) module. (3) The improved Efficient Layer Aggregation Networks-Coordinate Attention (ELAN-CA) and Spatial Pyramid Pooling-Coordinate Attention (SPP-CA) were used to extract action features and perform feature correction by ADD (Feature fusion by feature map summation) in the backbone. The results demonstrated that the FARnet achieved significantly better detection results than the YOLOv7-tiny network, where mAP@.5 improved by 0.1% from 99.4% to 99.5%, and the mAP@.5:.95 improved by 6.6% from 78.2% to 84.8%. Therefore, the FARnet can effectively detect and identify the “inspection” and “applying pesticides” actions of farmers and provide useful input information for the intelligent management system. Keywords: Action detection, Applying pesticides, Coordinate attention, FARnet, Inspection.
Eary Doubles: Tympanic Mechanisms and Cochlear Structures in Nabokov's Ada
Authors: Metzger Sabine
Published: July 2023

Abstract: As this paper will show, Ada 's bizarre telecommunication devices are far more than technical solutions of the problems imposed by Antiterran ban of electricity. Ada foregrounds their operation mode in terms of transmission and transduction, and, with it, what Jonathan Sterne identifies as sound reproduction devices' "tympanic principle" that simulates the mechanism of the human eardrum. Whether hand-cranked, operating on fluids like Olga Veen's bizarre invention and its offspring, the aquaphone, or on modulated current – Ada 's telecommunication devices are based on the tympanic principle. They are abstractions of the human ear, or "eary doubles" which turn Ada into the continuation of Nabokov's previous inquiries into sound propagation and the vibrational nexus. Ada , however, goes beyond the tympanum. Abstractions of the human ear are likewise the numerous cochlear structures to which the novel refers. Spirals and whelks evoke the cochlea which, located anatomically, to express it in Van's words, "between [tympanic] membrane and brain" processes sound's frequencies, time and timbre. Situated at the intersections of the physical and the physiological, of the technological and the organic, of acoustics and aesthetics, Ada 's eary doubles articulate Nabokov's keen interest in the physical and the physiological aspects of the auditory from which its metaphysical dimension derives.
Publishing Biomedical Research: a rapidly evolving ecosystem
Authors: Flier Jeffrey S.
Published: July 2023

ABSTRACT: The advancement of science requires the publication of research results so other scientists may examine, confirm, and build upon them, and the publishing ecosystem that mediates this process has undergone dramatic change over recent decades. This article takes a broad view of the biomedical research publishing system from its origins in the 17th century to the present day. It begins with a story from the author’s lab that illustrates a scientist’s complex interactions with the publishing system and then reviews the history, growth, and evolution of scientific publishing, including several recent disruptive developments: the digital transformation, the open access (OA) movement, the creation of “predatory journals,” and the emergence of preprint archives. Each has influenced scientific peer review and editorial decision-making, two processes critical to the conduct of medical and scientific research and culture. After briefly discussing concerns about the impact of politics on editorial decision-making, the article closes with thoughts on the future evolution of this publishing ecosystem, which will impact the biomedical research ecosystem that depends upon it. Beyond accelerated speed and improved access to publications, the community should prioritize research aimed at further enhancing the quality and impact of published research, the core goal of the scientific enterprise.
Lives Cut Short: suicide among adolescent females
Authors: Stacy Meaghan , Schulkin Jay
Published: July 2023

ABSTRACT: Suicide is a worldwide public health issue, and suicide ideation and behavior among adolescents, females in particular, have been increasing. Focusing on the risk factors that are unique to adolescents and adolescent females can help tailor and inform prevention strategies. There are unique biological, psychological, social, and societal factors that contribute to suicide ideation and behavior among adolescent females. Some of these include hormonal fluctuations and sensitivity, developing brain systems, impacts of social media, maladaptive coping, and peer influence. These changes do not occur in a vacuum and have recently been impacted by the COVID-19 pandemic, which has been associated with increased social isolation and decreased mental health. By identifying how these factors coalesce and interact to drive suicide ideation and behavior, we can derive potential solutions to this problem. Given the variability in individuals, families, and communities, and the interacting and reinforcing nature of these risk factors, a multi-pronged approach that incorporates multiple interventions and involves families, schools, and communities is needed.
Programmable Waveguides on 2D Coupled Silicon Ring Resonator Array
Authors: Konoike Ryotaro , Ikeda Kazuhiro
Published: July 2023

We propose and demonstrate dynamic formation of programmable waveguides on 2D coupled silicon ring resonator array with the size of 5×5. We successfully formed straight and bend waveguides with identical transmission spectra.
Multi-Wavelength Operation of Non-Isometric Electro-Optic Digital-to-Analog Converters
Authors: Ikeda Kohei , Kita Shota. , Cong Guangwei , Nozaki Kengo , Maegami Yuriko , Ohno Morifumi , Yamamoto Noritsugu , Yamada Koji , Shinya Akihiko , Notomi Masaya
Published: July 2023

We demonstrate a circuits-topology-based electro-optic digital-to-analog converter with a non-isometric reference for broader multi-wavelength operation. By tuning the input wavelengths properly, we could obtain more similar waveforms for different wavelengths than the isometric one.
Accuracy Improvement for Polarization Grating Based Circular Dichroism Measurements
Authors: Chen Yi , Liang Yu-Cheng , Wang Chun-Ta , Jeng Shie-Chang , Lee Chao-Kuei
Published: July 2023

In this work, by using a liquid crystal polarization grating, the error is effectively decreased from 34.4% to 0.1% for improving the accuracy in the circular dichroism measurement system. Meanwhile, the role of the residue is presented and discussed.
Comparing distant optical clocks to realize the redefinition of the second
Authors: Ido Tetsuya
Published: July 2023

Various methods to compare physically separated optical frequencies will be discussed. Particularly, an intercontinental comparison (Japan – Italy) of optical clocks using very long baseline interferometry (VLBI) will be presented in detail.
Fractal Superconducting Nanowire Single-Photon Detectors and Their Applications in Imaging
Authors: Feng Yifan , Meng Yun , Zou Kai , Hu Nan , Hao Zifan , Cui Xingyu , Yin Xiangjun , Yang Jingyu , Gyger Samuel , Steinhauer Stephan , Zwiller Val , Hu Xiaolong
Published: July 2023

We present our research on fractal superconducting nanowire single-photon detectors and their applications in light detection and ranging (LiDAR), full-Stokes polarimetric imaging, and non-line-of-sight imaging.
Resolution of quantum phase measurements using multi-photon states
Authors: Matsushita Tomonori , Hofmann Holger F.
Published: July 2023

We discuss the effects of multi-photon coherence on the probability of successfully distinguishing two different phase shifts in a single measurement of the photon number distribution in the output of an interferometer.
Error-Disturbance relations in spin measurement using Faraday interaction
Authors: Ho Le Bin , Edamatsu Keiichi
Published: July 2023

We model the quantum measurement of spin systems under the Faraday interaction with a polarized light meter and examine the error-disturbance relations comparing the Heisenberg-Arthurs-Kelly and the Branciard-Ozawa relations.
The space cooling capability of Janus emitter with different enclosure temperature
Authors: Kim Do Hyeon , Lee Gil Ju , Heo Se Yeon , Kang Il-Suk , Song Young Min
Published: July 2023

A Janus emitter (JET) allows releasing heat from enclosures efficiently. However, space-cooling is not demanded at night or winter. This study analyzes space-cooling performance of JET with different temperature gaps between outer and inner space.
Size-Controllable Fabrication of Quantum Dot Micro-Beads Using a Custom Developed UV-Curable CdSe and InP QD Photoresist
Authors: Kim Byeongseok , Chon Bumsoo , Kumar Samir , Shin Sanghoon , Ko Taewoo , Kang Sang Ook , Son Ho-Jin , Seo Sungkyu
Published: July 2023

This study reports the size on-demand fabrication of Quantum Dot (QD) micro-beads using a microfluidic chip with a specially designed InP/ZnSeS/ZnS and CdSe/ZnS QD photoresist mixed with a UV-curable composition called Super Coater.
Colloidal Quantum Dot Nanopatterning with E-beam lithography on flexible PET
Authors: Ko Taewoo , Kumar Samir , Shin Sanghoon , Kim Byeongseok , Seo Sungkyu
Published: July 2023

Quantum Dot(QD) patterning of at least 100nm resolution is possible through electron beam lithography on various substrates of chromium, silicon, and flexible ITO substrates. The QD pattern fabricated with E-beam was durable in bending.
Investigation of Circularly Polarized Standing-wave States Using Topological Polarization Singularities
Authors: Honda Tomoki , Yoda Taiki , Moritake Yuto , Ono Masaaki , Kuramochi Eiichi , Notomi Masaya
Published: July 2023

We have numerically and experimentally demonstrated the formation of standing wave modes with circularly polarized states at the edge of the photonic band gap using topological singular points with half-integer charges in photonic crystals. This mode is promising for creating a circularly polarized laser.
Scatterometry using deep learning for analysis of oil including phosphor
Authors: Hoshino Tetsuya , Narioka Shintaro , Aoki Sadao , Itoh Masahide , Kobayashi Masami
Published: July 2023

Deep learning was introduced to the scatterometry of isolated particles. We applied this method to oil droplets containing phosphors and analyzed the relationship between the amount of phosphor and the emission intensity.
Transmission via Sharp Bends in Glide-symmetric Photonic-Crystal Waveguides
Authors: Dai Wei , Yoda Taiki , Moritake Yuto , Notomi Masaya
Published: July 2023

Recently, high transmission via sharp bends have been reported in various valley-photonic waveguides without inversion symmetry. Here we report similar high transmission for one of touching bands in glide-symmetric photonic-crystal waveguides having inversion symmetry in triangular and square lattices.
Coherent Backscattering in Triangular Lattice Photonic Crystals
Authors: Kuribara Tomoya , Moritake Yuto , Notomi Masaya
Published: July 2023

We numerically demonstrated that the suppression of coherent backscattering near the Dirac point in a triangular lattice photonic crystal occurs over a wide frequency range. Furthermore, we clarify the effects of intervalley scattering and trigonal warping on the suppression.
Lasing oscillation from vertically standing hollow-core GaN nanowire on sapphire substrate
Authors: Takiguchi Masato , Sergent Sylvain , Damilano Benjamin , Vézian Stéphane , Chenot Sébastien , Yazigi Nicole , Yoda Taiki , Tsuchizawa Tai , Sumikura Hisashi , Shinya Akihiko , Notomi Masaya
Published: July 2023

We demonstrate lasing oscillation from a vertically standing hollow-core GaN nanowire fabricated on sapphire substrate by sublimation method. This unique laser has a potential to generate a vector light beam and are promising for future monolithic on-chip devices.
Robust Angular Anisotropy of Circularly Polarized Luminescence from Chiral Twisted Bipolar Conjugated Polymer Microspheres
Authors: Yamamoto Yohei , Oki Osamu , Yamagishi Hiroshi , Kulkarni Chidambar , Meskers Stefan C. J. , Meijer E. W. , Lin Zhan-Hong , Huang Jer-Shing
Published: July 2023

We present that conjugated polymer bearing chiral side chains self-assemble into solid microspheres with a twisted bipolar interior. The microspheres are mechanically robust enough to be handled with a microneedle under ambient conditions, allowing comprehensive examination of the angular anisotropy of CPL. The single microsphere exhibits distinct angularly anisotropic CPL with glum up to ∼0.5 in the equatorial plane, which is 2.5-fold greater than that along the polar axis.
Post-Growth Annealing and InGaSb Layer Insertion Effects on Metamorphic InAsSb on GaAs Substrate
Authors: Hombu Koki , Nakagawa Shota , Iwakiri Yuto , Maeda Koji , Arai Masakazu
Published: July 2023

We investigated the effect of post-growth annealing on metamorphic InAsSb on GaAs. The mid-infrared range photoluminescence intensity was improved, however, the surface flatness was deteriorated. The photoluminescence was also improved by inserting the InGaSb layer.
256-Gbit/s PAM-4 directly modulated membrane lasers on SiC substrate
Authors: Yamaoka Suguru , Diamantopoulos Nikolaos-Panteleimon , Nishi Hidetaka , Fujii Takuro , Takeda Koji , Hiraki Tatsurou , Tsurugaya Takuma , Kanazawa Shigeru , Tanobe Hiromasa , Kakitsuka Takaaki , Tsuchizawa Tai , Koyama Fumio , Matsuo Shinji
Published: July 2023

A membrane laser on high-thermal-conductivity SiC exhibits a 42-GHz relaxation oscillation frequency because of the large optical confinement and heat dissipation. Photon-photon resonance increases the bandwidth to 108 GHz capable of 256-Gbit/s PAM-4 signal transmission.
Al-Free GaAs Optical Phased Array for Near-Infrared Sensing
Authors: Wu Chensheng , Komatsu Kento , Tsuchiya Rihoko , Tanemura Takuo , Nakano Yoshiaki
Published: July 2023

Al-free GaAs/InGaP-based optical phased array (OPA) working at 905-nm wavelength is numerically demonstrated. Using high-mesa waveguides, large-scale OPA with 128 phase shifters can fit inside 1-mm2 footprint generating more than 100 resolvable points.
Probing the momentum-resolved dynamics of excitons in 2D semiconductors
Authors: Dani Keshav M.
Published: July 2023

Using time- and angle-resolved photoemission spectroscopy of microscopic samples of two-dimensional semiconductors, we study the nature of excitonic excitations.
Rapid Three-Dimensional Imaging Using Visible Bessel Beams Eliminating Side Lobe Effects
Authors: Kozawa Yuichi , Uesugi Yuuki , Sato Shunichi
Published: July 2023

Axially resolved, volumetric imaging using a visible Bessel beam with wavefront modulation for fluorescence is proposed. Rapid acquisition of volumetric images without apparent side lobe effects is demonstrated even for the one-photon excitation process.
A Computational Efficient Temporal Convolutional Network for Heart Rate Monitoring under Strenuous Exercising Condition using a mm-Wave FMCW Radar
Authors: Lai Shih-Hsuan , Chen Chun-Chia , Chuang Chun-Yen , Han Zai-Yuan , Cheng Kyle , Chen Irwin , Wu Vincent , Chen Jyehong
Published: July 2023

A mm-Wave FMCW radar system with a low-complexity temporal convolutional network for non-contact exercise heart-rate monitoring is demonstrated. With around 10% of original parameters, we achieve 85% average accuracy on various types of exercise equipment.
High Dimensional Optical Meta-devices: Classical to Quantum
Authors: Chen Mu Ku , Zhang Jingcheng , Liu Xiaoyuan , Tsai Din Ping
Published: July 2023

Meta-devices are ultra-thin optical elements with artificial nanoantennas. The applications of the meta-lens array are discussed from classical to quantum optics. The imaging, sensing, edge detecting, and high-dimensional quantum entanglement light source are demonstrated.
High Transmittance Multicolor Metasurface Holograms Made of Silicon Nitride
Authors: Yamaguchi Masakazu , Saito Hiroki , Yamada Naoyuki , Ikezawa Satoshi , Iwami Kentaro
Published: July 2023

High transmittance multicolor metasurface holograms were fabricated using SiN pillars as meta-atom. The phase distribution on the hologram surface was calculated by the iterative Fourier transform method at the design wavelengths of 445 nm, 532 nm, and 633 nm. The fabricated hologram showed successful projection of color image with high brightness and color matching to the target image. The average transmittance calculated by microspectroscopy was 97%, which was much higher than that of previous studies.
Plasmonic Color Generation by Metal Nanopillar Array
Authors: Sugimoto Yosuke , Kajikawa Kotaro , Toma Mana
Published: July 2023

Metal nanopillar arrays were fabricated by metal deposition on manufactured moth-eye film. They showed plasmonic colors varied by the metal thickness. The colors from metal nanopillars arrays can be applied for colorimetric plasmonic biosensors.
Metasurface measuring twisted light in turbulence
Authors: Dinter Thomas , Kühner Lucca , Li Chenhao , Weber Thomas , Tittl Andreas , Maier Stefan A. , Dawes Judith M. , Ren Haoran
Published: July 2023

Practical free-space communication systems suffer from turbulence-induced phase distortions to propagating beams, destroying the orthogonality of orbital angular momentum (OAM) modes used for space-division multiplexing and introducing modal crosstalk. Here we present the design and use of an ultrathin OAM mode-sorting metasurface for investigating the deterioration of OAM orthogonality under different turbulence conditions, offering a compact, fast and efficient way to measure the OAM spectrum.
Fabrication technology of a low-loss plasmonic waveguide containing both “plasmonic- friendly” and “plasmonic- unfriendly” metals
Authors: Zayets Vadym , Serdeha Iryna , Grygoruk Valerii
Published: July 2023

Fabrication technology, which allows a substantial decrease of the plasmonic propagation loss for both a “plasmon- friendly” metal like Au, Cu or Al and “plasmon- unfriendly” metal like Co, Fe or Cr, have been developed and experimentally demonstrated. Optimization of the optical confinement is used to reduce the propagation loss below 1 dB per a plasmonic device.
Output Power Enhancement in Photonic-Based RF Generation by Optical Pulse Compression: Performance Improvement of 300-GHz band 10-Gbit/s ASK system
Authors: Toichi Keita , Uemura Yuta , Ogawa Keita , Tada Wataru , Suzuki Masayuki , Toda Hiroyuki , Fujita Masayuki , Nagatsuma Tadao
Published: July 2023

We experimentally demonstrate performance improvement of photonic-based 300-GHz band 10-Gbit/s ASK system by optical pulse compression in a highly nonlinear fiber. The amplitude of the received eye pattern is increased by 2.6 times (= 8.1 dB) and the dc photo current of the photodiode that yields the same bit-error rate is reduced by a factor of 0.60 (= –4.3 dB).
Photonic-Wireless Seamless Network to support 6G Radio Access Network in Terahertz Band
Authors: Sung Minkyu , Kim Eon-Sang , Moon Sang-Rok , Lee Joon Ki , Cho Seung-Hyun
Published: July 2023

We experimentally demonstrate the photonic-wireless network for 6G-RAN in 0.3 terahertz. Technical consideration for implementation of photonic-wireless network is discussed through noise contribution analysis.
Multi-dimensional Multiplexed Fiber-Wireless Transmission in the THz Band
Authors: Yu Xianbin , Zhang Hongqi , Yang Zuomin , Lu Zijie , Wang Shiwei , Pang Xiaodan , Zhang Lu , Zhang Xianmin
Published: July 2023

We propose and experimentally demonstrate multi-dimensional multiplexed THz photonic wireless communication systems, achieving wireless net data rates of up to 510 Gbit/s and 1.059 Tbit/s in the 350 GHz band.
Spectrally Efficient THz-wave Multi-carrier Wireless Communication Using THz-domain Fourier Transformation-type Demultiplexer
Authors: Takiguchi Koichi , Nishio Nozomu
Published: July 2023

We report on spectrally efficient multi-carrier wireless communication in the 300 GHz-band with a THz-domain Fourier transformation-based channel demultiplexer. We carried out 4 x 7.0 Gsymbol/s communication with the spectral efficiency of about 0.6 symbol/s/Hz.
Dual-comb-based Microwave Photonic Beamforming
Authors: Wang Mian , Xue Xiaoxiao , Xing Yunlu , Li Shangyuan , Zheng Xiaoping
Published: July 2023

A novel scheme based on heterodyning of dual optical frequency combs is proposed for wideband phased arrays. True-time-delay beam steering can be achieved without the need for complex delay lines.
Actuating stimulated Brillouin scattering in silicon nitride photonic circuits
Authors: Ye Kaixuan , Botter Roel , Daulay Okky , Klaver Yvan , Marpaung David
Published: July 2023

Stimulated Brillouin scattering (SBS) can enable high-resolution signal processing. Here, we demonstrate advanced control of SBS in multilayer silicon nitride waveguides. We further utilize the SBS gain to demonstrate a high-rejection microwave photonic notch filter.
Optical Field Detector for Sub-Nanojoule Pulses using Insulator-Encapsulated Metal Nanostructures
Authors: Arai Ko , Okazaki Daiki , Morichika Ikki , Ashihara Satoshi
Published: July 2023

We developed an all-solid-state optical field detector that employs electron tunneling at a metal-insulator interface induced by the plasmonic near-field. Both high photoelectric efficiency and high damage tolerance are achieved by completely encapsulating metal nanoantennas.
Laser wakefield acceleration driven by 1-TW laser pulse in a dense, sub-mm nitrogen gas cell
Authors: Tran Dang Khoa , Lai Po-Wei , Liu Kun-Ni , Lin Xiang-Yuan , Lin Ming-Wei , Chu Hsu-Hsin , Wang Jyhpyng
Published: July 2023

We demonstrate the feasibility of using 1-TW, 40-fs laser pulses to generate electrons with peak energy ≈ 9.4 MeV and charge ≈ 32 pC through the laser wakefield acceleration in a dense, 450-µm long nitrogen gas cell.
Active Demethylation of Cancer Cells using Terahertz Radiation for Potential Cancer Treatment
Authors: Son Joo-Hiuk
Published: July 2023

Carcinogenesis involves DNA methylation which is a primary alteration in DNA in the development of cancer before genetic mutation. Because the abnormal DNA methylation is found in most cancer cells, the assessment of DNA methylation using terahertz radiation can be a novel optical method to detect and control cancer. The methylation has been directly observed by terahertz time-domain spectroscopy and this epigenetic chemical change could be manipulated to the state of demethylation using resonant terahertz radiation. Demethylation of cancer cells is a key issue in epigenetic cancer therapy and our results may lead to the treatment of cancer using electromagnetic waves.
High-resolution spectral imaging at ~ 6 THz
Authors: Guo Cang-He , Wu Ming-Hsiung , Huang Yen-Chieh
Published: July 2023

We demonstrated spectral imaging for various materials between 5.43 and 6.1 THz with a pixel dimension between 100 and 250 μm.
Controlling the Non-Hermitian Graphene Dirac Plasmons and Its Application to Terahertz Laser Transistors
Authors: Otsuji Taiichi
Published: July 2023

We introduce a new scheme of actively controlling the non-Hermitian Dirac plasmons in a graphene-channel laser transistor structure. Numerical simulation demonstrates the capability of 100-Gbit/s-class ultrafast gain-switching in its plasmonic THz laser operation by electrically modulating the
PT symmetry by the applied bias voltages.
Manipulating Polarization-division Multiplexed Terahertz Signals with Four-wire Waveguides
Authors: Dong Junliang , Tomasino Alessandro , Balistreri Giacomo , You Pei , Vorobiov Anton , Charette Étienne , Le Drogoff Boris , Chaker Mohamed , Yurtsever Aycan , Stivala Salvatore , Vincenti Maria A. , De Angelis Costantino , Kip Detlef , Azaña José , Morandotti Roberto
Published: July 2023

We demonstrate a new metal-wire waveguide topology, namely a four-wire waveguide, which simultaneously acts as a broadband terahertz polarization-division multiplexer and a novel platform to realize the independent manipulation of polarization-division multiplexed terahertz signals.
Fast and Low-Cost Fabrication of Large-Area Terahertz Metasurface Devices Using Laser-Induced Graphene Technology
Authors: Wang Zongyuan , Hu Bin
Published: July 2023

Using a fabrication system with a focal spot ≤5 μm, the LIG-based terahertz metasurface with a size of 15 mm × 15 mm and a resolution of 30 μm can be fabricated in 34 seconds.
Stable optical beats in laser chaos for THz wave
Authors: Kuwashima Fumiyoshi , Jarrahi Mona , Cakmakyapan Semih , Morikawa Osamu , Shirao Takuya , Iwao Kazuyuki , Kurihara Kazuyoshi , Kitahara Hideaki , Furuya Takashi , Wada Kenji , Nakajima Makoto , Tani Masahiko
Published: July 2023

Stability of optical beats in a chaotically oscillating laser is compared to that of a free-running continuous-wave laser using a highly efficient plasmonic photomixer. Using a chaotically oscillating laser diode, stable optical beats are observed over an operation current range of 60-90 mA. And stability of optical beats near the laser threshold level in a chaotically oscillating laser is also evaluated. The high stability of chaotically oscillating lasers makes these lasers promising candidates for optical pump sources in terahertz time-domain spectroscopy systems.
Wavefront Evaluation of a 250-J Laser “HELIA” toward 10 Hz Operation
Authors: Sekine Takashi , Hatano Yuma , Muramatsu Yuki , Morita Takaaki , Kurata Masateru , Kurita Takashi , Tamaoki Yoshinori , Watari Takeshi , Iguchi Takuto , Yoshimura Ryo , Ikeya Yuki , Takeuchi Yasuki , Kawai Kazuki , Zheng Yujin , Kato Yoshinori , Kurita Norio , Kawashima Toshiyuki
Published: July 2023

Over 250 J pulse energy with around 30 ns pulse duration at 0.2 Hz repetition rate was demonstrated by laser diode pumped cryogenically cooled Yb:YAG ceramics laser. In this report, experimental results of wavefront distortion and energy amplification at 10 Hz repetition rate is presented.
High Energy (pulsed) Diode-pumped Multi-slab Laser Operated at 1.5kW level
Authors: Severová Patricie , Divoký Martin , Pilař Jan , Hanuš Martin , Navrátil Petr , Denk Ondřej , Mason Paul , Butcher Thomas , Banerjee Saumyabrata , De Vido Maria Stefania , Edwards Chris , Collier John , Smrž Martin , Mocek Tomas
Published: July 2023

Achieving output energy of 146J in 10ns at 10 Hz repetition rate from multi-Joule cryogenic gas-cooled DPSSL is presented. This is 40% energy and power increase in comparison to the most powerful multi-Joule high power laser system.
Beam shaping in high-energy high-average-power nanosecond laser system Bivoj
Authors: Paliesek Tomáš , Navrátil Petr , Pilař Jan , Hanuš Martin , Divoký Martin , Smrž Martin , Mocek Tomáš
Published: July 2023

We developed a fail-safe programmable beam shaping system that corrects gain non-uniformity in the laser system Bivoj (150 J, 10 Hz, 10 ns) and successfully tested it in the first power amplifier at 6 J at 10 Hz.
Generation of High Energy Green Pulse Bursts from a DPSSL Amplifier
Authors: Mason Paul , Barrett Hugh , Banerjee Saumyabrata , Edwards Chris , Collier John
Published: July 2023

A burst of five green (515 nm) pulses each separated by 29.4 ns (34 MHz) with 2.0 J total energy has been generated at low IR fluence as an alternative pump source for Ti:Sa amplifiers.
Real-time UWOC Experiments in Indoor Environment Using Multipoint Real-seawater Channel under Constant Water Vibration Generated by 3 m/s Light Wind
Authors: Tanaka Keita , Kobori Fumiya , Nakagawa Tomoya , Masaoka Momoka , Kariya Ayumu , Ishikawa Tomoya , Eguchi Shota , Inoue Yoshiaki , Kimura Tomotaka , Kodama Takahiro
Published: July 2023

In an indoor environment of an underwater optical wireless communication system with six coastal, 74 cm seawater vibration channels under weak winds of 3 m/s, we experimentally achieve real-time-BER = 3.8×10-3 for all seawater channels.
Optical Coupling between a Single Tin-vacancy Center and a Photonic Crystal Nanocavity in Diamond
Authors: Kuruma Kazuhiro , Pingault Benjamin , Chia Cleaven , Renaud Dylan , Hoffmann Patrick , Iwamoto Satoshi , Ronning Carsten , Lončar Marko
Published: July 2023

We demonstrate coupling of a tin-vacancy (SnV) center and a photonic crystal nanobeam cavity in diamond. We observed a 12-hold intensity enhancement of SnV emission and a 16-hold reduction in its lifetime under resonance conditions.
A Machine Learning-based Approach to Model Highly-thermally Robust Metasurface Absorber
Authors: Ijaz Sumbel , Noureen Sadia , Rehman Bacha , Zubair Muhammad , Mehmood Muhammad Qasim , Massoud Yehia
Published: July 2023

For accelerating design procedure of compact and efficient on-chip nano-photonics and to aid computationally expensive, time-exhaustive state-of-the-art iterative simulation schemes, regression-based machine-learning models are demonstrated that predict the optical response and structural parameters of the meta-atoms.
10 J, 100 Hz, 1 kW conductive-cooled active-mirror laser
Authors: ogino Jumpei , tsubakimoto Koji , yoshida Hidetsugu , motokoshi Shinji , morio Noboru , matsumoto Keiko , fujioka Kana , tokita Shigeki , miyanaga Noriaki , ueda Ken-ichi , kodama Ryousuke , yogo Akifumi
Published: July 2023

We report a 1 kW diode-pumped laser with a Yb:YAG conductive-cooled active-mirror chain, delivering 10 J of energetic pulses at 100 Hz.
Suppressing stimulated Brillouin scattering through higher order mode excitation in a multimode fiber
Authors: Warren-Smith Stephen C. , Wisal Kabish , Chen Chun-Wei , Stone A. Douglas , Nguyen Linh V. , Henderson-Sapir Ori , Ottaway David , Ebendoff-Heidepriem Heike , Cao Hui
Published: July 2023

We numerically and experimentally demonstrate that spreading power into higher order modes of a multimode optical fiber can be used to suppress stimulated Brillouin scattering for a high-power narrow linewidth system. This opens the opportunity for suppressing nonlinear effects in fibers using adaptive mode launching techniques while retaining the ability to produce spatially coherent beams through control of the light phase.
Self-Frequency Shift Controlled Tuning of Third Harmonic Signal in a Silica Nanowire
Authors: Mishra Akhileshwar , V Seth Mathew , Pant Ravi
Published: July 2023

We exploit Raman induced self-frequency shift of sub-nJ mode locked pulses in a 50 m long polarization maintaining fiber to tune the third harmonic signal, generated in a silica nanowire, by ~18 THz.
Demonstration of A Clements-type 16 × 16 Photonic Analog Matrix Processor Based on Silicon Photonics
Authors: Kita S. , Nozaki K. , Takata K. , Ikeda K. , Aoyama K. , Suzuki K. , Maegami Y. , Ohno M. , Cong G. , Yamamoto N. , Yamada K. , Shinya A. , Sawada H. , Notomi M.
Published: July 2023

We fabricated and packaged a Clements-type 16×16 photonic matrix processor based on silicon photonics. By applying circuit parameter learning, we have obtained an R2 determination coefficient of ~0.859 and demonstrated a clear identity matrix implementation.
Silicon Photonics for Training Deep Neural Networks
Authors: Shastri Bhavin J. , Filipovich Matthew J. , Guo Zhimu , Prucnal Paul R. , Shekhar Sudip , Sorger Volker J.
Published: July 2023

Analog photonic networks as deep learning hardware accelerators are trained on standard digital electronics. We propose an on-chip training of neural networks enabled by a silicon photonic architecture for parallel, efficient, and fast data operations.
Deep Reservoir Computing Based on Injection-Locked Quantum Dot Lasers
Authors: Lin Bao-De , Tang Jia-Yan , Yu Jingyi , He Xuming , Wang Cheng
Published: July 2023

This work proposes a deep reservoir computing architecture based on cascading injection-locked quantum dot lasers. It is proved that the four-layer reservoir computing performs better than the single-layer one on multiple benchmark tasks.
Prediction and Replication of Chaotic Dynamics Using Photonic Reservoir Computing with Semiconductor Laser
Authors: Kawakami Atsuya , Kanno Kazutaka , Uchida Atsushi
Published: July 2023

We perform short-term prediction of chaotic time series by reservoir computing using a semiconductor laser with optical feedback. We also replicate a chaotic attractor to reproduce a long-term behavior of chaotic dynamics.
Fourier ptychography multi-parameter neural network with composite physical priori optimization
Authors: Yang Delong , Zhang Shaohui , Zheng Chuanjian , Zhou Guocheng , Cao Lei , Hu Yao , Hao Qun
Published: July 2023

Fourier ptychography microscopy(FPM) is a recently developed computational imaging approach for microscopic super-resolution imaging. Nevertheless, FPM has high requirements for the system construction and data acquisition processes which brings many limitations to its practical applications. In this paper, we propose a Fourier ptychography multi-parameter neural network (FPMN) with composite physical prior optimization. A hybrid parameter determination strategy combining physical imaging model and data-driven network training is proposed to recover the multi layers of the network corresponding to different physical parameters, including sample complex function, system pupil function, defocus distance, LED array position deviation and illumination intensity fluctuation, etc. Among these parameters, LED array position deviation is recovered based on the features of brightfield to darkfield transition low-resolution images while the others are recovered in the process of training of the neural network. The feasibility and effectiveness of FPMN are verified through simulations and actual experiments. Therefore, FPMN can evidently reduce the requirement for practical applications of FPM.
T cell activation and differentiation monitored non-invasively with Raman spectroscopy
Authors: Pavillon N. , Smith N. I.
Published: July 2023

We show how Raman spectroscopy can be used to non-invasively monitor the changes occurring at single-cell level during the differentiation of naive T cells into effector cells following activation through in vitro stimulation.
Detection of Liposomes Encapsulating Neurotransmitters by Optical Trapping Raman Spectroscopy
Authors: Masui Kyoko , Nawa Yasunori , Tokumitsu Shunsuke , Kawarai Makoto , Minoshima Wataru , Tani Tomomi , Fujita Satoshi , Ishitobi Hidekazu , Hosokawa Chie , Inouye Yasushi
Published: July 2023

Optical trapping Raman spectroscopy was used for detection of glutamate molecules encapsulated in liposomes as a mimic of synaptic vesicles. The trapping behavior of glutamate molecules was analyzed by the number of Raman intensity.
Raman Imaging of Primary Cultured Hippocampal Neuron for Evaluating Neuronal Maturation
Authors: Nagano Takahiro , Masui Kyoko , Nawa Yasunori , Ishitobi Hidekazu , Tani Tomomi , Fujita Satoshi , Fujita Katsumasa , Hosokawa Chie , Inouye Yasushi
Published: July 2023

We investigated the distribution changes of cytochrome c in mitochondria of neurons by Raman imaging. Cytochrome c gradually spread to neurites, implying that mitochondria increased in areas of high energy demand, including synaptic site.
Natural Photoreceptive-Protein Toolbox of Microbial Rhodopsins
Authors: Inoue Keiichi
Published: July 2023

Rhodopsin is a photoreceptive membrane protein functioning as a photosensor in our eyes. Also, a large distinctive family of a different type of rhodopsin in unicellular microorganism, which is called “microbial rhodopsin” is known. Microbial rhodopsins exhibit a variety of biological function upon light absorption: light-driven ion pump, light-gated ion channel, phototactic sensor, gene regulation of photosynthetic pigment proteins, light-dependent enzyme and so on. Recently, those functions of microbial rhodopsins are used in optogenetics, a new biological technology to manipulate various physiological events in vivo light. I will introduce our recent study on new microbial rhodopsins with novel functions and their molecular mechanisms by spectroscopic and structural biological methods.
A Compact and Low-Cost Rolling-LiDAR for Three-Dimensional Mapping
Authors: Nishiguchi Soichiro , Maeda Tomohiro , Sotobayashi Hideyuki , Kanno Atsushi
Published: July 2023

A compact and low-cost rolling-LiDAR system is proposed. A three-dimensional map was reconstructed by correcting the movement and rotation of the scan data from a two-dimensional LiDAR module. The basic operation of the rolling-LiDAR is experimentally demonstrated.
Real Time RI Sensing of Optofluidic Based Waveguide Particle Plasmon Resonance Sensor
Authors: Barshilia Devesh , Chang Guo-En
Published: July 2023

The proposed technology employs gold nano particles (AuNPs) to enhance resolution and sensitivity. Sensor was successfully fabricated and characterized. RI sensing performance shows good resolution of 1.19×10-4 RIU and normalized sensitivity of 0.4892 RIU-1.
Electro-Optic Spectral Tuning in Multi-Wavelength Nonperiodically Poled Lithium Niobate Optical Parametric Oscillator
Authors: Deng Lin-Ming , Lin Shue-Shan , Pham Tien-Dat , Tseng Quan-Hsiang , Chung Hung-Pin , Chang Wei-Kun , Chen Yen-Hung
Published: July 2023

We report an electro-optically (EO) tunable multi-wavelength optical parametric oscillator (OPO) based on a nonperiodically poled lithium niobate. EO spectral tuning rates of 0.5-0.58 nm/(kV/mm) are obtained with this OPO in the telecom C-L bands.
Controlling the Emission Spectrum of a Laser with Anisotropic Mirrors
Authors: Bisson Jean-François , Amouzou Koffi Novignon , Nonguierma Yves Christian
Published: July 2023

Anisotropic lasers mirrors with adjusted birefringence and diattenuation can produce degenerate polarization eigenstates that eliminate dual polarization emission in a standing wave resonator. Such laser mirrors also produce orthogonally-polarized counter-propagating waves, which eliminate spatial hole burning and promote single longitudinal mode emission. These mirrors can be obtained by depositing nanostructured thin films on top of conventional laser mirrors using physical vapor deposition on inclined substrates, offering single frequency emission of compact microchip ceramic lasers.
Comparison of materials for deep-ultraviolet optical isolator
Authors: Tamaru Yuki , Kumai Hikaru , Fuchimukai Atsushi , Uehara Hiyori , Miura Taisuke , Yasuhara Ryo
Published: July 2023

The Verdet constant in deep-ultraviolet region was evaluated and compared in synthetic quartz, LiY0.85Er0.15F4 and LiYF4. The DUV optical isolator can realize with the moderate magnetic field.
Attosecond electronic dynamics of core-excited N2O molecules probed by transient soft X-ray spectroscopy
Authors: Saito Nariyuki , Douguet Nicolas , Ishii Nobuhisa , Kanai Teruto , Wu Yi , Chew Andrew , Han Seunghwoi , Schneider Barry I. , Olsen Jeppe , Argenti Luca , Chang Zenghu , Itatani Jiro
Published: July 2023

Half-cycle oscillation is observed in transient absorption spectra of N2O molecules at Nitrogen K edge (400 eV) irradiated by intense IR pulses. The oscillation is attributed to tunneling ionization of core-excited states by TDSE-based simulation.
EUV High Harmonic Generation from Solids with Propagation Control Capabilities
Authors: Won Seungjai , Choi Seungman , Kim Byunggi , Kim Taewon , Kim Young-Jin , Kim Seung-Woo
Published: July 2023

We present a non-collinear irradiation scheme of high harmonic generation from solids, permitting self-convergent focusing of ultrafast EUV pulses to a 400 nm spot for elaborate experiments.
Dynamic Localization and High Harmonic Generation in Solids
Authors: Kayanuma Yosuke , Ikeda Tatsuhiko N. , Tanaka Satoshi
Published: July 2023

We present a novel theoretical framework to describe the electron dynamics in solids under very high intensity optical pulses. It is pointed out that, due to the dynamic localization, high harmonics of vortex beams will be emitted under the irradiation of circularly polarized pump-pulses.