bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of remote sensing, GIS techniques and new technologies for the monitoring and protection of the coastal areas of Achaia’s and Ilia’s prefectures
Authors: Αποστολόπουλος Διονύσιος
Published: September 2023

Η άνοδος της μέσης στάθμης της θάλασσας λόγω της κλιματικής αλλαγής σε συνδυασμό με την εκδήλωση ακραίων καιρικών φαινομένων, τη μείωση της στερεοπαροχής λόγω ανθρώπινων επεμβάσεων και τη συχνή αλλαγή της θέσης εκβολής των ρεμάτων, καθιστούν τις παράκτιες περιοχές ιδιαίτερα ευάλωτες, προκαλούν αστοχίες των υφιστάμενων παράκτιων κατασκευών πλήττοντας τόσο το τοπικό οικοσύστημα όσο και την τοπική οικονομία. Για το λόγο αυτό είναι αναγκαίο άμεσα και αξιόπιστα να αποδίδεται με αριθμητικούς όρους το μέγεθος μιας παράκτιας μεταβολής ώστε να μπορούν να ληφθούν τα κατάλληλα μέτρα αντιμετώπισης, από τις αρχές. Η παρούσα διατριβή θέτει ως βασικούς στόχους: α) την διερεύνηση της χρήσης όλων των δωρεάν διαθέσιμων δεδομένων τηλεπισκόπησης, χαμηλής και μέσης χωρικής διακριτικής ικανότητας για την εκτίμηση της μεταβολής της θέσης της ακτογραμμής, β) την ανάπτυξη ενός μοντέλου εντοπισμού των παράκτιων περιοχών των Νομών Ηλείας και Αχαΐας που παρουσιάζουν μεταβολές της ακτογραμμής, με τη χρήση δεδομένων υψηλής διακριτικής ικανότητας με συνδυασμό κατάλληλων εφαρμογών Γεωγραφικών Συστημάτων Πληροφοριών (G.I.S).Αρχικά, έγινε ανασκόπηση της παγκόσμιας βιβλιογραφίας σχετικά με τα δεδομένα τηλεπισκόπησης, τις μεθόδους και τους δείκτες που έχουν χρησιμοποιηθεί ευρέως για τον προσδιορισμό της μεταβολής των ακτών. Αξιολογήθηκαν μελέτες που βασίστηκαν σε δεδομένα τηλεπισκόπησης χαμηλής και μέσης ανάλυσης, όπως Landsat 5/7/8 (TM,ETM+,OLI), Sentinel-2, CORONA, SPOT1-5 και IRS. Κατόπιν έγινε ταξινόμηση και ποσοτικοποίηση της ακρίβειας των δεδομένων αυτών σε σχέση με αντίστοιχα δεδομένα υψηλής ανάλυσης. Επιπλέον αξιολογήθηκε η δυνατότητα πρόβλεψης της μελλοντικής θέσης της ακτογραμμής με χρήση ειδικού λογισμικού και εντοπίστηκαν σχετικά προβλήματα και περιορισμοί. Τα αποτελέσματα της έρευνας απέδειξαν ότι τα δορυφορικά δεδομένα μέσης και χαμηλής ανάλυσης δεν είναι δυνατό να αποδώσουν την χωροχρονική μεταβολή της ακτογραμμής με ακρίβεια όπως τα δεδομένα υψηλής ανάλυσης.Εντοπίστηκαν και ερευνήθηκαν, με χρήση δεδομένων υψηλής και πολύ υψηλής ανάλυσης, περιοχές των Ν. Ηλείας και Αχαΐας οι οποίες εμφανίζουν μεταβολές της ακτογραμμής (διάβρωση/απόθεση). Επιπλέον εξετάστηκε πιλοτικά η χρήση εικόνων προερχόμενων από Συστήματα μη Επανδρωμένων Αεροσκαφών (ΣμηΕΑ) τόσο για την απόδοση της θέσης της ακτογραμμής όσο και στην αποτύπωση της βαθυμετρίας του πυθμένα. Λαμβάνοντας υπόψη ότι την τελευταία δεκαετία ολοένα και περισσότεροι δορυφόροι, εξοπλισμένοι με όργανα υψηλής ευκρίνειας και τεχνολογίας, τίθενται σε τροχιά παρακολουθώντας τη Γη από διάφορους φορείς (ερευνητικούς, στρατιωτικούς κλπ), είναι βέβαιο πως στο μέλλον οι ερευνητές θα έχουν στη διάθεσή τους δεδομένα υψηλής ακρίβειας και έτσι τα αποτελέσματα και οι μέθοδοι που αναπτύσσονται στη παρούσα διατριβή θα μπορούν να αποτελέσουν έναν ολοκληρωμένο οδηγό για την εκτίμηση της εξέλιξης της παράκτιας ζώνης.
Το πρόταγμα των αναρχικών κοινωνιών στο Μ. Μπούτσκιν
Authors: Τσιριόπουλος Γεράσιμος
Published: September 2023

Η παρούσα έρευνα αναλύει τις ουσιώδεις πτυχές της πολιτικής θεωρίας του Μάρεϊ Μπούκτσιν. Τα πολιτικά και φιλοσοφικά ζητήματα με τα οποία ο στοχαστής καταπιάστηκε αποτελούν πεδία σύγκρουσης αλλά και γόνιμης αντιπαράθεσης από τις απαρχές των οργανωμένων κοινωνιών και η έρευνα αυτή εστιάζει στην ιστορική τους πορεία. Η διατριβή, μεταξύ άλλων, επεξεργάζεται και αναλύει κομβικές έννοιες της πολιτικής φιλοσοφίας του διανοητή. Αυτές είναι η ισότητα, η ελευθερία, η κυριαρχία, η κοινότητα, ο ελευθεριακός κοινοτισμός, ο δημοκρατικός συνομοσπονδισμός, ο κομμουναλισμός, η ανθρώπινη βούληση και η κοινωνική οικολογία. Παράλληλα, διερευνάται ο τρόπος με τον οποίο τις χρησιμοποιεί ο Μπούκτσιν σε συνάρτηση με το εκάστοτε πολιτικό πλαίσιο, ενώ, ταυτόχρονα, κατατίθεται η πολιτική τους προοπτική.
Characterization of By-products with High Fat Content Derived from the Production of Bovine Gelatin
Authors: Garcia Londoño Victor Alonso , Marín González Natalia , Roa-Acosta Diego Fernando , Agudelo Laverde Lina Marcela , Botero Laura , Lellesch Liliana Maria
Published: September 2023

Background: Gelatin is a protein obtained by partial hydrolysis of collagen contained in skins, connective tissue and/or animal bones, which are by-products of the meat industry. The main raw material to produce bovine gelatin is the dermis of the skin, but there is a variation in fat and moisture content depending on the bovine skin origin. As a contribution to the circular economy and sustainability, these by-products with high fat content and the fat released from them during the gelatin production process can be managed for food industries, mainly in the development or formulation of animal feed.

Methods: For the initial physicochemical characterization, moisture, fat, protein and ashes content were determined. Once the by-products with high fat content were identified, alteration parameters such as acidity, peroxide and saponification indexes were evaluated. Additionally, thermal, rheological and fatty acid composition characterization was carried out in order to study the possible applications of the by-products.

Results and Discussion: The results showed that certain by-products have a fat content of less than 15%, so the viability of their use is limited. On the other hand, some by-products have a fat content exceeding 30%; however, their extraction can only be done manually, resulting in a low efficiency process. By-products removed from the supernatant in the extractors presented fat percentages of 99.9 and 98.9%, and there exists the possibility of implementing a mechanical method for their extraction. The analysis of alteration and oxidation parameters, thermal and rheological characterization, fatty acid profile and solid fat content were exclusively conducted on these high-fat content by-products. Based on the characterization, these by-products could be valued and incorporated into animal feed formulations. Nevertheless, certain limitations exist for their use in applications such as biodiesel production or the food industry.
Therapeutic effectiveness of virtual reality-based exercise through Oculus Quest 2 on balance, dizziness, nystagmus, and quality of life in patients with posterior canal benign paroxysmal positional vertigo - a randomized control trial protocol
Authors: Jachak Shrushti , Raghuveer Raghumahanti
Published: September 2023

BPPV (benign paroxysmal positional vertigo) is one of the most prevalent causes of vertigo.The clinical features include nausea, imbalance, nystagmus, light-headedness, dizziness, fear of fall. Various exercises and maneuvers have been proved to be beneficial till date. Many technologies had also contributed in the physical rehabilitation. Virtual rehabilitation using virtual reality (VR) is a novel innovation in therapy. Virtual reality is widely used in treating the patients and adding to get back to their day-to-day life. Occulus quest 2 is a VR device. Depending on the patient's motions, Oculus Quest enables you to interact genuinely while immersing yourself in a virtual reality. BPPV is a very common condition and Posterior canal BPPV (PC-BPPV) is commonest of all. Most of the available literature targets conventional treatment including Exercises for repositioning and adaptation of otoconia. Comparative studies between the conventional rehabilitation protocols have also been done. There is paucity of research on virtual rehabilitation in PC-BPPV. VR utilizing Oculus Quest 2, a device designed to incorporate VR environment can be used to mobilize the patients head position there by repositioning the otoconia. Lack of evidence related to Virtual rehabilitation and specifically Oculus Quest 2 emphasises the need to study its effects on BPPV outcomes like balance, dizziness, quality of life and nystagmus. In this study, an attempt is made to use the oculus quest 2 for BPPV rehabilitation in addition to standard treatment. Patients will be divided into 2 groups control and experimental. Control group will receive Brandt-droff exercise on the other hand experimental will receive occulus quest 2 game “Coaster combat” in adjunct to the conventional. Berg balance scale, nystagmus time quality of life, dizziness handicap index and vertigo symptom scale are the outcomes. Outcomes will be assed at baseline and after 4 weeks.
'I-know-it-when-I-see-it' - Motivating Examples in the Social Psychology of Conspiracy Theory Theory
Authors: Dentith M R. X.
Published: September 2023

Looking at set of 76 representative articles published by social psychologists between 2017 and 2023 (reviewed between December 2022 and February 2023), I examine the role of motivating examples---a kind of illustrative example, typically used by researchers at the beginning of their work to motivate the issue or problem they want to resolve or address in that work---in the social psychological work on conspiracy theory. Through an examination of the language around how motivating examples are introduced and used in the social psychological literature, I argue that the abstract and vague way that social psychologists employ such examples ends up relying on what Joseph Uscinski and Adam Enders deem as an unviable and easily abused `I-know-it-when-I-see-it' standard. As will be demonstrated, much of the recent work in the social psychology of conspiracy theory assumes and thus fails to establish what is supposedly problematic about belief in the conspiracy theories used as motivating examples. As a consequence the surveyed work typically fails to adequately capture belief in actual conspiracy theories, let alone establish a case for a general suspicion of such beliefs. This work, then, adds to and extends upon existing critiques of the social psychology of conspiracy theory by members of the wider community of scholars studying conspiracy theories. The upshot of this research is that if social psychologists want their work to be of use to the broader scholarly community studying these things called `conspiracy theories', then they need to connect their work on the problems of conspiracy beliefs or mindsets to concrete examples of belief in unwarranted conspiracy theories.
Gastrointestinal disorders and leaky gut syndrome in endurance athletes
Authors: Murawiec Izabela , Konert Magdalena
Published: September 2023

Gastrointestinal disorders are common in endurance-sport athletes, and can negatively affect physical performance and general health. During long lasting exercises such like ultramarathon, triathlon, marathon a characteristic phenomenon is the increase in the concentration many proinflammatory markers and proteins such like IL-1, IL-6, TNF-alfa, LPS, CK and C-reactive protein. Despite observed biochemical changes on of the typical “side effects” of physical activity is increased intestinal permeability, also called to as leaky gut.

Recent research has demonstrated that even one hour of of intense endurance training note even with a maximum work capacity can lead to leaky gut symptoms and gastrointestinal disorders.

Increased intestinal permeability is accomplished with changes of numerus molecular biomarkers, that indicate presence of this disease state and the degradation of the intestinal mucosa, such like lipopolysaccharides, zonulin, lactulose/rhamnose ratio, occludin and I-FABP, and many other.

The understanding of this processes and understanding of the molecular mechanisms involved in the induction of leaky gut syndrome can lead to funding new methods and means of both avoiding and treating this condition.
Estrategias de Turismo Sostenible en las Cittaslow Españolas.
Authors: Maroto-Martos Juan-Carlos , Pinos-Navarrete Aida , Carballo-Cruz Edianny
Published: September 2023

El turismo tiene una enorme capacidad para generar crecimiento económico y dinamizar el mercado laboral, siendo uno de sus principales retos actuales, contribuir al desarrollo sostenible. El enfoque de la filosofía slow propugna el turismo slow como forma de vida y de consumo responsable y sostenible, y la red cittaslow española ha adoptado dicho planteamiento. El objetivo de esta investigación es analizar el avance en el cumplimiento de los principios del turismo slow en la red cittaslow en España. La metodología aplicada consiste en analizar comparativamente las actuaciones de oferta turística que divulgan las web oficiales de los ayuntamientos de las cittaslow españolas, a la luz de principios del turismo slow. Los hallazgos muestran que los 12 municipios que se han registrado en la red de cittaslow en España tienen relevancia en patrimonio histórico y recursos naturales, pero sólo un 30% aprovecha la singularidad de ser una cittaslow, para impulsar su turismo, de forma sistemática. La publicación de sus indicadores cittaslow podría acelerar los avances
Metodología para Estudiar Carnavales, y el caso de la Comarca "Cinco Villas" (Aragón, España).
Authors: Nogueras-Edo María
Published: September 2023

El carnaval, cuyos orígenes son precristianos, es una de las fiestas más extendidas entre las diferentes culturas del mundo, pero su celebración ha sufrido prohibiciones por lo que su caracterización requiere apoyarse en testimonios generacionales. Nuestro objetivo consiste en establecer una metodología cualitativa para reconstruir la celebración de la fiesta del carnaval en distintos territorios y aplicarla al caso del carnaval de la comarca aragonesa “Cinco Villas”, compuesta de 31 pueblos. La metodología de la investigación consiste en: contextualización del territorio, trabajo de campo para la recopilación de testimonios orales mediante historias de vida, entrevistas focalizadas y grupos de discusión; y luego trabajo de gabinete y de interpretación. Los resultados prueban que el carnaval tradicional de “Cinco Villas” contiene ritos de fertilidad y fecundidad en forma de bromas y juegos; con alusiones a cosechas, la tierra y rebaños. Aunque actualmente reducido a fiesta infantil, la fiesta duerme esperando que las elites políticas o económicas agenden su recuperación para cohesión social de la Comarca.
Funkcjonowanie kultu maryjnego w sanktuarium w Różanymstoku w świetle ksiąg cudów i łask
Authors: Pomian Julia
Published: September 2023

The phenomena of the functioning of the cult of the Virgin Mary are among the most interesting issues in the studies of old Polish society. Specific communication strategies, among which we should mention sermons and donations, stirred a growing interest in pilgrimages to certain places of worship. One of the most important places is Różanystok, located in the Podlasie region. The activities of the Dominican order there left behind a lot of testimony of graces, collected in a printed book. Its analysis reveals various stylistic solutions, discussed in this article.
A case of acute extensive viral sinusitis secondary to acute Epstein Barr virus
Authors: Khine Su , Edupuganti Srujan , Upadhyay Manoj , Liroff Kaitlin
Published: September 2023

Infectious mononucleosis (IM), the most common presentation of acute Epstein Barr virus (EBV) infection, typically presents with fever, pharyngitis and lymphadenopathy. We describe an unusual case of IM presenting as acute sinusitis. A 25 year-old male presented to the emergency department with worsening right frontal sinus pain along with fever, chills, and greenish nasal discharge for 3 weeks. Laboratory workup showed leukocytosis with high lymphocyte counts as well as transaminitis. Facial computerized tomography (CT) showed extensive right frontal, ethmoidal and maxillary sinusitis and antrochoanal polyp. The patient underwent endoscopy with drainage of purulent material and polyp removal. Unfortunately, cultures of the sample were not sent and bacterial infection could not be ruled out. Broad spectrum antibiotics were continued. Pathology of redundant tissue revealed large atypical lymphocytes with positive EBV-encoded RNA and lack of evidence of extranodal natural killer/T-cell (NK/T-cell) type lymphoma (ENKTCL). Tests for serum EBV IgM antibodies and EBV early Antigen antibodies were positive, indicating acute EBV infection. Lymphocytosis resolved along with significant clinical improvement at the 10-day follow up visit. Even though patient did receive antibiotics, multiple factors including isolated lymphocytosis, pathology positive for EBV with no neutrophilia were more suggestive of sinusitis caused by viral infection, EBV in this case. Lymphocytosis with fever and sore throat should prompt physicians to consider IM. There are no known reports in the literature of EBV as a causal organism for acute viral sinusitis. There are some studies relating EBV with ENKTCL. It is unknown whether this particular patient with a history of EBV sinusitis will be at high risk for nasal type lymphoma in the future. Further studies should be conducted to understand the pathogenesis and relationship between EBV and ENKTCL.
Aberration budget analysis of EUV lithography from the imaging performance of a contact layer in a 5  nm technology node
Authors: Chen Zhishu , Dong Lisong , Ding Huwen , Wei Yayi
Published: September 2023

By analyzing the impact of aberration in an extreme ultraviolet
lithography projector on the imaging indicators of the test patterns
for a contact layer in a 5 nm technology node, this paper
establishes a mathematical aberration model based on the back
propagating neutral network. On the basis of an aberration model, a
method for estimating the aberration budget is proposed, which can
help reduce the difficulty of achieving imaging performance thresholds
in actual production. The performance of the results given by this
method is verified by using a rigorous simulation. The results show
that the model is highly accurate in predicting an aberration
distribution that meets the requirements through an inverse
sensitivity analysis and can calculate the wavefront aberration margin
based on imaging indicators.
Semi-embedded slot waveguide electro-optic modulator
Authors: Li Renjie , Chen Ming , Shi Xinyu , Han Wenhao , Wang Xiangyang , Zhao Wanli , Liu Jinbiao , Teng Chuanxin , Deng Shijie , Cheng Yu , Yuan Libo
Published: September 2023

Electro-optic modulators are essential devices on silicon photonic chips in modern
optical communication networks. This paper presents a compact,
low-loss electro-optic modulator. The modulation efficiency is greatly
improved by embedding the lower half of the slot waveguide into the
buried oxide layer and inserting graphene at the junction. The
interaction of graphene with an optical field in a waveguide is
studied using the finite element method. The functions of phase
modulation and absorption modulation are realized by changing the gate
voltage to change the chemical potential of graphene. The
semi-embedded slot waveguide optical modulator has a length of
50 µm. After simulation verification, it can be used as an
electro-absorption modulator and can achieve a modulation depth of
26.38 dB and an insertion loss of 0.60 dB. When used as
an electro-refractive modulator, it can be realized with a linear
change of phase from zero to π; the total insertion loss is only
0.59 dB. The modulator has a modulation bandwidth of
79.6 GHz, and the energy consumption as electro-absorption and
electro-refraction modulation are 0.51 and 1.92 pj/bit,
respectively. Compared with common electro-optic modulators, the
electro-optic modulator designed in this paper has a higher modulation
effect and also takes into account the advantages of low insertion
loss and low energy consumption. This research is helpful for the
design of higher-performance optical communication network
devices.
Dual-view transport of intensity phase imaging flow cytometry
Authors: Sun Aihui , Li Yaxi , Zhu Pengfei , He Xiaoliang , Jiang Zhilong , Kong Yan , Liu Cheng , Wang Shouyu
Published: September 2023

In this work, we design multi-parameter phase imaging flow cytometry based on dual-view transport of intensity (MPFC), which integrates phase imaging and microfluidics to a microscope, to obtain single-shot quantitative phase imaging on cells flowing in the microfluidic channel. The MPFC system has been proven with simple configuration, accurate phase retrieval, high imaging contrast, and real-time imaging and has been successfully employed not only in imaging, recognizing, and analyzing the flowing cells even with high-flowing velocities but also in tracking cell motilities, including rotation and binary rotation. Current results suggest that our proposed MPFC provides an effective tool for imaging and analyzing cells in microfluidics and can be potentially used in both fundamental and clinical studies.
Transmission of S band signal using optical parametric amplifier based on PPLN waveguide
Authors: Wanifeni Ndadi , Asobe Masaki , Kazama Takushi , Enbutsu Koji , Umeki Takeshi
Published: September 2023

We demonstrate the transmission of the S band signal using an optical parametric amplifier as a repeater. Penalty-free transmission was achieved utilizing dispersion compensation enabled by the spectral inversion capability of the amplifier.
A conformal mapping approach to broadband nonlinear optics on chip
Authors: Huang Chunyu , Luo Yu , Zhao Yule , Ma Xiaofei , Yan Zhiwei , Liu Ziyi , Sheng Chong , Zhu Shining , Liu Hui
Published: September 2023

We proposed a general strategy based on transformation optics to design curved accelerating waveguides with spatially gradient curvatures able to achieve broadband nonlinear frequency conversion on chip.
Observation of Thermally Tunable Terahertz Surface Plasmons via Room Temperature-Grown Tungsten Oxide Dipole Cavities
Authors: Jana Arun , Khot Atul C. , Rane Shreeya , Roy Chowdhury Dibakar , Kim Tae Geun
Published: September 2023

Based on the tunable optoelectronic properties of WO3, we implemented a terahertz sub-wavelength dipole cavity that can exhibit temperature-dependent (25 to 110 °C) dynamic modifications in the surface plasmon resonance characteristics.
The Passive Modelocking Master Equation
Authors: Prati Franco , Perego Auro M. , Redondo Javier , de Valcárcel Germán J.
Published: September 2023

Despite the fundamental role of passive modelocking of lasers in ultrafast science and technology, no theory explains the pulse stability and dynamics under general conditions. Here we close that gap.
Femtosecond laser direct writing beam splitters in MgO:LN waveguide
Authors: Pan Shih-Zhe , Li Hui-Mi , Song Yu-Ting , Xu Ze-Wei , Hsieh Zhi-Ming , Hsiang Wei-Wei , Lin Shou-Tai
Published: September 2023

We report fs laser direct writing beam splitters in z-cut MgO-doped congruent lithium niobate crystal based on type II modification. The power splitting ratio was measured to be 0.53/0.47.
Vortex solitons in nonlinear multicore fiber with six periphery cores and one central core
Authors: Khushhali Shamaem , Marini Andrea , Roy Samudra
Published: September 2023

We find localized vortex solitons in nonlinear multicore fibres with six periphery and one central core having two opposite polarizations using discrete nonlinear Schrödinger and Manakov equations and analyze it's stability.
Optimal Incident Light Angle-fitted Portable Microscopy System for High Contrast 3D-projected Cell Applications
Authors: Jang Yeongseok , Jung Jinmu , Oh Jonghyun
Published: September 2023

Observation of cells under a dark field microscope can provide great insights, but real-time monitoring within a cell incubator has been a major challenge. We optimized the light path for high contrast to observe the projected cells.
Prediction of Soliton Self-frequency Shift in an Amplifying Nonlinear Medium with Moment Method
Authors: Kormokar Robi , Rochette Martin
Published: September 2023

We derive moment equations predicting adiabatic soliton spectral shift in a gain fiber. The resulting coupled equations provide insight and accurately quantify soliton properties without the computational resources required to solve the nonlinear Schrödinger equation.
Energy-dependent collisional model for nonlinear underwater laser interactions*
Authors: Petrov G. M. , Peterson J. R. , Jones T. G. , Chen Y. , Hafizi B.
Published: September 2023

A model of non-linear picosecond laser pulse interactions in liquid water has been augmented with a set of electron temperature-dependent collisional rates, which can determine the conduction band electron temperature and density.
Testing the Applicability of the WKB Method to Parametric Instabilities in Inhomogeneous Plasmas Using Stimulated Raman Backscatter in a Steep Density Gradient Plasma
Authors: Sinclair Mitchell , Wu Yipeng , Farrell Audrey , Zhang Chaojie , Marsh Kenneth A , Tsung Frank , Mori Warren B. , Joshi Chan
Published: September 2023

We are testing the applicability via experiments, theory, and PIC simulations of the WKB approximation to Stimulated Raman backscattering instability induced by an intense two picosecond CO2 laser pulse in a steep density gradient plasma.
QED plasma induced laser frequency upconversion and reflection
Authors: Qu Kenan , Fisch Nathaniel J.
Published: September 2023

QED cascades can create electron-positron pairs at sufficiently high density to exhibit collective plasma effects. Signatures of collective pair plasma effects can appear through plasma-induced frequency upshifts and coherent laser reflection.
Photonics microwave genenration using soliton microcombs in billion Q optical microresonator
Authors: Yao Lu , Xiao Yun-Feng
Published: September 2023

We report the soliton microwave oscillators using oversized billion Q optical microresonator. The synthesized X-band microwaves features an absolute phase noise level of -107(-133) dBc/Hz at 1(10) kHz offset frequency.
Nonlinear Optical Spectroscopy of Perovskites
Authors: Neupane Chandra P. , Sylvester Jeremy , Singhapurage Helani A. S. , Mudiyanselage Dinusha M. S. R. , Ganikhanov Feruz
Published: September 2023

Ultrafast decay of optical phonon has been studied in wide-bandgap BaSnO3 and SrTiO3 perovskites using a nonlinear spectroscopic technique. Measured phonon decay rates are within 1.4 – 2.3ps-1and can be explained within the framework of parametric phonon interactions.
Narrowband BaGa2GeSe6 Optical Parametric Oscillator Pumped in an Intracavity Cascade Configuration
Authors: Chen Weidong , Wang Li , Divliansky Ivan B. , Pasiskevicius Valdas , Mhibik Oussama , Moelster Kjell M. , Zukauskas Andrius , Glebov Leonid B. , Badikov Valeriy V. , Badikov Dmitrii V. , Petrov Valentin
Published: September 2023

We present a tunable (6.62-11.34 µm), singly-resonant, cascade optical parametric oscillator with intracavity pumping of BaGa2GeSe6 in the second stage and spectral narrowing realized by a Volume Bragg Grating, providing millijoule output at 100 Hz.
Lithium Niobate Nanophotonic Waveguides for Ultraviolet to Mid-Infrared Supercontinuum
Authors: Wu Tsung-Han , Chang Peter , Diddams Scott A.
Published: September 2023

We design thin-film lithium niobate waveguides that leverage geometric dispersion engineering, chirped poling and both the
χ
(2) and
χ
(3) nonlinearities to produce supercontinuum extending from the ultraviolet to the mid-infrared.
Second Harmonic Generation Enhancement by Air Plasma
Authors: Fu Shing Yiu , Francis Kareem Jamaal Garriga , Chong Mervin Lim Pac , E Yiwen , Zhang X.-C.
Published: September 2023

We observe a hundredfold enhanced, directional second harmonic generation as a fundamental beam focuses into a laser-induced air plasma. The enhancement, detectable even with pulses beyond 6 ps, is highlighted among concurrent second harmonic processes.
FWM-Driven Coherent Dispersive Wave Generation Enabling Efficient Spectral Translation of Frequency Comb with Low-Power Picosecond Pulses
Authors: Zhao Yanjing , Cheng Yujun , Lin Kaibin , Zheng Yi , Kim Chanju , Yuan Jinhui , Yvind Kresten , Li Qian , Pu Minhao
Published: September 2023

We demonstrate spectral translation of a frequency comb from 1.57 µm to 2 µm in a highly-nonlinear AlGaAs-on-insulator waveguide via four-wave-mixing-driven coherent dispersive wave generation using l-picosecond pump pulses with peak power of 5 W.
Observation of Conjugate OAM Mode Generation via Modulational Instability in a Hollow Ring-Core Fiber
Authors: Dacha Sai Kanth , Elder Henry F. , Zhu Wenqi , Agrawal Amit , Sprangle Phillip A. , Murphy Thomas E.
Published: September 2023

We report experimental observation of modulational instability in a hollow ring-core fiber, in which a pumped l = +10 spin-orbit anti-aligned (SOaa) produces spectral sidebands consisting additionally of the l = –10 spin-orbit aligned (SOa) mode.
Dissipative Soliton Molecules in Graphene-based Active Disordered Metamaterials
Authors: Paul Ashis , Marini Andrea , Roy Samudra
Published: September 2023

We numerically investigate the temporal dynamics of soliton molecules generated in a dissipative graphene-based active disordered metamaterial. Our results shed light on the future development of cost-effective cavity-free random lasers.
Giant Enhancement of Second-harmonic Generation via Doubly Symmetry Protected Bound States in the Continuum of Photonic Crystal Slabs
Authors: Wang Ji Tong , Li Fengxia , Panoiu Nicolae C.
Published: September 2023

Symmetry-protected bound states in the continuum are employed to engineer high-Q resonances at both fundamental frequency and second-harmonic in a photonic crystal slab, enabling enhancement of second-harmonic generation up to eight orders of magnitude.
Integrated microcomb with broadband tunable normal and anomalous dispersion
Authors: Ji Qing-Xin , Jin Warren , Guo Joel , Wu Lue , Liu Peng , Feshali Avi , Paniccia Mario , Bowers John , Vahala Kerry
Published: September 2023

Broadband dispersion tuning (3.9 THz) with only modest resonant frequency tuning (20 GHz) is demonstrated in vernier-coupled optical resonators. Tuning from bright to dark-pulse comb states is demonstrated using a fixed-wavelength hybridly-integrated semiconductor laser pump.
Frequency comb generation with lasers near exceptional points
Authors: Gao Xingwei , He Hao , Sobolewski Scott , Hsu Chia Wei
Published: September 2023

We show that exceptional points and the nonlinearity of a laser can induce an oscillating population inversion, creating a frequency comb. We develop an ab-initio theory describing all steady-state properties of such lasers.
Optical Frequency Comb via Electro-Optically Locked Parametric Oscillator in Thin Film Lithium Niobate
Authors: Stokowski Hubert S. , Dean Devin J. , Hwang Alexander Y. , Park Taewon , Celik Oguz Tolga , Jankowski Marc , Ansari Vahid , Fejer Martin M. , Safavi-Naeini Amir H.
Published: September 2023

We present a novel frequency comb based on thin film lithium niobate. We utilize the electro-optic effect and parametric amplification in an optical resonator to generate a comb of more than 1,000 lines.
Observation of Spin Switching via Magnetic Floquet State Induced by Tesla-class Terahertz Magnetic Fields
Authors: Zhang Z.-Y. , Maruyama K. , Kurihara T. , Nakajima M. , Tachizaki T. , Kanemitsu Y. , Hirori H.
Published: September 2023

We study the control of the magnetic-order parameter in the canted antiferromagnet Sm0.7Er0.3FeO3 by Floquet engineering with strong terahertz magnetic fields. Furthermore, we use the ability to control the order parameter to induce spin switching.
Nonlinear Liquid Crystalline Chiral Photonic Crystals for Visible to Mid-infrared Optical Switching and Modulation
Authors: Khoo I. C. , Chen C.-W. , Feng T.-M , Lin Tsuen-Hsien
Published: September 2023

We show by theory and experiment the feasibility of polarization switching and modulations of picoseconds – femtoseconds pulsed laser vector beams throughout the visible to mid-infrared spectrum using highly nonlinear liquid crystalline chiral photonic crystals.
Observation of Third-Harmonic Oscillation from Nonlinear Spin Precession Induced by Terahertz Magnetic Fields
Authors: Zhang Z.-Y. , Sekiguchi F. , Moriyama T. , Satoh T. , Mukai Y. , Tanaka K. , Yamamoto T. , Kageyama H. , Kanemitsu Y. , Hirori H.
Published: September 2023

We observed a large spin-precession amplitude that generates the second and third harmonics of spin motion in an antiferromagnet by using large THz magnetic near field, and clarified their relation with the nonlinear spin dynamics.
Cavity-enhanced second- and third-harmonic generation from a diamond microdisk
Authors: Flågan Sigurd , Itoi Joe , Shandilya Prasoon K. , El-Sayed Waleed , Zohari Elham , Losby Joseph E. , Barclay Paul E.
Published: September 2023

We demonstrate that defects in diamond break inversion symmetry, by observing cavity-enhanced second-harmonic generation – an otherwise forbidden process. The observed second- and third-harmonic emission follows a clear dependency with cavity de-tuning, indicating a doubly-resonant configuration.
Tiniest Sources of Spontaneous Parametric Down Conversion
Authors: Chekhova Maria
Published: September 2023

Spontaneous parametric down-conversion in ultrathin films or metasurfaces has loose phasematching, providing enormous freedom for quantum state engineering. This includes tunable polarization entanglement, resonant enhancement of emission, controlled directivity, and generation of complex quantum states.
Nonlinear Optics and Optomagnetics in Quantum Materials
Authors: Majedi Hamed
Published: September 2023

The main physics of nonlinear optical properties of two-dimensional Dirac materials with a specific e xample of graphene is discussed. Our experimental work on characterization of the temporal and spectral properties of Kerr coefficient in graphene is presented. Theories of Optomagnetism in graphene and newly proposed microwave opto-magnetism in superconductors are elaborated.
Supercontinuum noise reduction with short normal dispersion fibers – a simple and general technique
Authors: Hansen Rasmus E. , Smith Callum R. , Moltke Asbjørn M. , Petersen Christian R. , Raghuraman Sidharthan , Yoo Seongwoo , Bang Ole
Published: September 2023

We reduce the noise of soliton-based supercontinuum sources by adding a short normal dispersion fiber to force the spectrally distributed solitons to spectrally broaden through self-phase modulation and thereby overlap to average out the noise.
Observation of Optomechanical Solitons in a WGM Microresonator
Authors: Li Fu , Fu Zhoutian , Jia Di , Yang Lan
Published: September 2023

Mechanical solitons, as a counterpart of optical solitons, have been observed in an optical whispering gallery mode (WGM) toroidal microresonator through nonlinear optomechanical interaction. This new mechanism expands the solitons into a different spectrum window.
Nonlinear binding of multiple interacting optical pulses with signed analogous masses
Authors: Guo Qing , Zhang Ping , Wu Hao , Gong Zeyu , Nie Binbin , Hu Yi , Chen Zhigang , Xu Jingjun
Published: September 2023

We report the first experimental realization of nonlinear binding of multiple interacting optical pulses with signed analogous masses. Soliton repulsion is balanced judiciously via the attraction exerted by dispersive waves in fiber-optic transmission.
A high performance fully tunable laser-based neural network
Authors: Skalli Anas , Goldmann Mirko , Porte Xavier , Haghighi Nasibeh , Reitzenstein Stephan , Lott James A. , Brunner Daniel
Published: September 2023

We experimentally demonstrate a fully tunable and scalable neural network of 350+ parallel nodes based on a semiconductor laser, our system achieves high performance and a high classification bandwidth of 15KHz for the MNIST dataset.
Matrix-Vector Multiplication using Mixed Space-Frequency Multiplexing of Optical Frequency Combs
Authors: Honari Mostafa , Park Byoungjun , Kim Yonghwi , Suh Myoung-Gyun
Published: September 2023

We propose a parallel optical matrix-vector multiplier using mixed space-frequency multiplexing of optical frequency combs. The demonstrated system is highly modular, scalable and easy to program. With spatial multiplexing and hyperspectral encoding, such an architecture can enable future optical information processing systems beyond Peta OPS.
Modelling and Integrating Nonlinear Optical Transformations in Neural Networks
Authors: Oguz Ilker , Suter Louis J. E. , Hsieh Jih-Liang , Yildirim Mustafa , Dinc Niyazi Ulas , Moser Christophe , Psaltis Demetri
Published: September 2023

We experimentally demonstrate a hybrid optical-digital neural network utilizing a high-dimensional nonlinear optics system. Precise digital modelling enables the system to achieve competitive performance in machine learning tasks.
Generation and manipulation of twin photons in Thin Film Lithium Niobate platform: from a single photon source to frequency ghost imaging
Authors: Henry Antoine , Barral David , Zaquine Isabelle , Boes Andreas , Mitchell Arnan , Belabas Nadia , Bencheikh Kamel
Published: September 2023

We describe bright and broad twin photons generation at 1560 nm in a periodically poled thin film lithium niobate waveguide. It is used to demonstrate single photon emission, frequency Hong–Ou–Mandel interference and ghost imaging.
Characterizing the spatiotemporal correlations of bright entangled quantum states of light using classical methods
Authors: Kulkarni Girish , Amooei Mahtab , Rioux Jeremy , Braverman Boris , Upham Jeremy , Chekhova Maria V. , Boyd Robert W.
Published: September 2023

We classically model parametric down-conversion as a difference-frequency generation of the pump and a stochastic vacuum field. We then experimentally characterize the output fields produced in the high-gain regime using only intensity measurements.
Strongly coupled stimulated Brillouin scattering in plasmas for generation and amplification of intense vortex and vector pulses
Authors: Wu Yipeng , Zhang Chaojie , Nie Zan , Sinclair Mitchell , Farrell Audrey , Marsh Ken A , Alves E. Paulo , Tsung Frank , Mori Warren B. , Joshi Chan
Published: September 2023

We propose a scheme that can efficiently g enerate a nd a mplify vortex and vector pulses to high intensities by employing strongly-coupled Brillouin scattering in plas-mas. We show various angular momentum couplings, leading to the creation of new exotic pulses.
Integrated Lithium Niobate OPO for Tunable Mid-IR Spectroscopy
Authors: Hwang Alexander Y. , Stokowski Hubert , Park Taewon , Jankowski Marc , McKenna Timothy P. , Mishra Jatadhari , Fejer Martin M. , Safavi-Naeini Amir H.
Published: September 2023

We present an on-chip OPO in thin-film lithium niobate that generates 3 µm MIR idler light tunable over >350 nm and is used for proof-of-concept gas spectroscopy.
Soliton pulse pairs at multiple colors in normal dispersion microresonators
Authors: Yuan Zhiquan , Gao Maodong , Yu Yan , Wang Heming , Jin Warren , Ji Qing-Xin , Feshali Avi , Paniccia Mario , Bowers John , Vahala Kerry
Published: September 2023

Femtosecond pulse pairs are generated in coupled microresonators featuring nor-mal dispersion. This bright soliton mode locking modality is observed to recur at multiple spectral windows and is shown to extend to additional coupled rings.
Electrically Driven Amplified Spontaneous Emission (ASE) from a Solution-Processed Colloidal-Quantum-Dot Device
Authors: Ahn Namyoung , Livache Clément , Pinchetti Valerio , Jung Heeyoung , Jin Ho , Klimov Victor I.
Published: September 2023

By employing quantum dots with suppressed Auger recombination and a ‘current-focusing’ electroluminescent architecture with an integrated photonic waveguide, we realize for the first time ASE with a solution-processed optical gain medium (Nature 617, 79, 2023).
Hybrid waveguide based augmented reality display system with extra large field of view and 2D exit pupil expansion
Authors: Wu Yuanjun , Pan Chang , Lu Changtai , Zhang Yinxin , Zhang Lin , Huang Zhanhua
Published: September 2023

For a waveguide display device, the field of view (FOV) is a key parameter for evaluating its optical performance. To address this issue, we propose a hybrid waveguide system, which is composed of two projectors, two in-couplers, two half-mirror arrays and an out-coupler. We use two projectors to generate the left and right parts of the output image separately, which can increase the upper limit of the FOV significantly. Unlike conventional waveguide-based system, we use half-mirror arrays instead of folding gratings to realize 2D exit pupil expansion. By doing so, the total internal reflection condition can always be met during the pupil expansion process. To solve the difficulty in designing collimating optical system with large FOV, we propose a method of tilting the projection system. The hybrid waveguide system can realize a FOV of 88°(H) × 53°(V).
Spatiotemporal response of concave VLS grating to ultra-short X-ray pulses
Authors: Hu Kai , Zhu Ye , Wu Chen , Li Qinming , Xu Zhongmin , Wang Qiuping , Zhang Weiqing , Yang Chuan
Published: September 2023

In soft X-ray free-electron laser (FEL) beamlines, variable-line-spacing (VLS) gratings are often used as dispersive components of monochromators and spectrometers due to their combined dispersion and focusing properties. X-ray FEL pulses passing through the VLS grating can result in not only transverse focusing but also spatiotemporal coupling effects, such as pulse front tilt, pulse front rotation, and pulse stretching. In this paper, we present a theoretical study of the spatiotemporal response of concave VLS gratings to ultra-short X-ray pulses. The theoretical analysis indicates that the tilt angle of the non-zero diffraction orders varies with the propagation distance, and disappears at the focus, where the focal lengths and pulse stretching differ for different diffraction orders. The model demonstrates the pulse duration after the concave VLS grating is the convolution of the initial pulse duration and the stretching term induced by dispersion, while the beam size at the focus in x dimension is the convolution of the geometric scaling beam size and the dispersion term. This work provides a mathematical explanation for the spatiotemporal response of concave VLS grating to ultra-short X-ray pulses and offers valuable insights into the design of FEL grating monochromators, spectrometers, pulse compressors, and pulse stretchers.
High Q-factor, ultrasensitivity slot microring resonator sensor based on chalcogenide glasses: erratum
Authors: Zhang Xuelei , Zhou Chenfeng , Luo Ye , Yang Zhen , Zhang Wei , Li Lan , Xu Peipeng , Zhang Peiqing , Xu Tiefeng
Published: September 2023

We correct the error in [Opt. Express 30, 3866 (2022)10.1364/OE.450092], Fig. 6(c). The unit of the vertical axis in the figure should be arbitrary units, not dB. All the conclusions are unchanged after the correction.
DBPFNet: a dual-band polarization image fusion network based on the attention mechanism and atrous spatial pyramid pooling
Authors: Wu Yunan , Chang Jun , Ma Ning , Yang Yining , Ji Zhongye , Huang Yi
Published: September 2023

In the current image fusion techniques, typically dual-band images are fused to obtain a fused image with salient target information, or intensity and polarization images are fused to achieve an image with enhanced visual perception. However, the current lack of dual-band polarization image datasets and effective fusion methods pose significant challenges for extracting more information in a single image. To address these problems, we construct a dataset containing intensity and polarization images in the visible and near-infrared bands. Furthermore, we propose an end-to-end image fusion network using attention mechanisms and atrous spatial pyramid pooling to extract key information and multi-scale global contextual information. Moreover, we design efficient loss functions to train the network. The experiments verify that the proposed method achieves better performance than the state-of-the-art in both subjective and objective evaluations.
High-average-power single-longitudinal-mode pulse laser based on a pulse saturation seed-injection locking OPO
Authors: Qin Jiliang , Song Jiaqi , Cao Xuechen , Cheng Donglin , Lu Huadong
Published: September 2023

A high-average-power and narrow-linewidth nanosecond (ns) pulse 824 nm laser is a crucial source for the generation of deep-ultraviolet (DUV) 248 nm laser by means of the sum-frequency process with the 354.5 nm laser. To this purpose, in this Letter, we present a seed-injection-locked high-average-power ns pulse single-longitudinal-mode (SLM) 824 nm laser. By developing a novel, to the best of our knowledge, pulse-saturated seed-injection locking method, disturbance of the pulse laser on the locking of the injected seed laser is successfully eliminated. As a result, the output power of 824 nm laser is up to 21.2 W at the incident pump power of 48.1 W, and the pulse width is 15 ns. Especially, the signal-to-noise ratio of the detected modulated sideband signal exceeds 28 dB, which ensures that the achieved linewidth of the 824 nm laser is as narrow as 38.8 MHz. These results demonstrate the potential of the proposed pulse saturation seed-injection locking OPO cavity for high-power and narrow-linewidth laser applications.
Arbitrary terahertz chirality construction and flexible manipulation enabled by anisotropic liquid crystal coupled chiral metasurfaces
Authors: Jiang Xinhao , Ji Yunyun , Fan Fei , Jiang Songlin , Tan Zhiyu , Zhao Huijun , Cheng Jierong , Chang Shengjiang
Published: September 2023

Chiral metasurfaces integrated with active materials can dynamically control the chirality of electromagnetic waves, making them highly significant in physics, chemistry, and biology. Herein, we theoretically proposed a general and feasible design scheme to develop a chiral metadevice based on a bilayer anisotropic metasurface and a monolayer liquid crystal (LC), which can construct and flexibly manipulate arbitrary terahertz (THz) chirality. When the twist angle between the anisotropic axes of two metasurfaces θ is not 0°, the spatial mirror symmetry of the chiral metadevice is broken, resulting in a strong THz chiral response. In addition, the introduction of anisotropic LCs not only enhances the chiral response of the metadevice but also induces the flipping modulation and frequency tunability of the chirality. More importantly, by optimizing the θ, we can flexibly design the arbitrary chiral response and the operating frequency of chirality, thereby promoting the emergence of various chiral manipulation devices. The experimental results show that the maximum circular dichroism can reach −33  dB at 0.94 THz and flip to 28 dB at 0.69 THz by rotating the LC optical axis from the x to y axis, with the maximum operating frequency tunable range of ∼120  GHz. We expect this design strategy can create new possibilities for the advancement of active THz chiral devices and their applications, including chiral spectroscopy, molecular recognition, biosensing, and fingerprint detection.
Fast Two-Photon Interferometer Capable of Spectral Binning for Quantum Telescopy
Authors: Nomerotski Andrei , Jirsa Jakub , Kulkov Sergei , Marcisovsky Michal , Bernasconi Ermanno , Bruschini Claudio , Burri Samuel , Charbon Edoardo , Mueninghoff Aaron , Vintskevich Stephen , Crawford Jesse , Abrahao Raphael A. , Martinez-Rincon Julian , Stankus Paul
Published: September 2023

We describe a novel type of two-photon interferometer, capable of spectral binning, for quantum-assisted astrometry. We also demonstrated a single-photon spectrometer with spectral and timing resolutions of 0.1 nm and 50 ps, which can be used for this purpose. This work opens new possibilities in future astronomical measurements.
Quantum hypothesis testing for exoplanet detection and spectroscopy
Authors: Huang Zixin , Lupo Cosmo
Published: September 2023

Detecting the faint emission of a secondary source in the proximity of the much brighter one has been the most severe obstacle for using direct imaging in searching for exoplanets. Using quantum state discrimination and quantum imaging techniques, we show that one can significantly reduce the probability of error in detecting the presence of a weak secondary source, even when the two sources have small angular separations. Similar techniques can be applied to perform atmospheric spectroscopy.
Ultrafast Rydberg Experiments with Ultracold Atoms in Optical Tweezers
Authors: de Léséleuc S. , Chew Y. , Tomita T. , Mahesh T. P. , Sugawa S. , Ohmori K.
Published: September 2023

By combining techniques from the ultracold atom and ultrafast laser communities, we explore the interaction between Rydberg atoms in tweezers on the nanosecond timescale and open the path towards ultrafast quantum engineering with Rydberg atoms.