bluuebunny/crossref_metadata_2025 huggingface dataset:
Secure integration of extremely resource-constrained nodes on distributed ROS2 applications
Authors: Spilere Nandi Giann , Pereira David , Proença José , Tovar Eduardo , Rodriguez Antonio , Garrido Pablo
Published: July 2023

Background: modern robots employ artificial intelligence algorithms in a broad ange of applications. These robots acquire information about their surroundings and use these highly-specialized algorithms to reason about their next actions. Despite their effectiveness, artificial intelligence algorithms are highly susceptible to adversarial attacks. This work focuses on mitigating attacks aimed at tampering with the communication channel between nodes running micro-ROS, which is an adaptation of the Robot Operating System (ROS) for extremely resource-constrained devices (usually assigned to collect information), and more robust nodes running ROS2, typically in charge of executing computationally costly tasks, like processing artificial intelligence algorithms.

Methods: we followed the instructions described in the Data Distribution Service for Extremely Resource Constrained Environments (DDS-XRCE) specification on how to secure the communication between micro-ROS and ROS2 nodes and developed a custom communication transport that combines the application programming interface (API) provided by eProsima and the implementation of the Transport Security Layer version 1.3 (TLS 1.3) protocol developed by wolfSSL.

Results: first, we present the first open-source transport layer based on TLS 1.3 to secure the communication between micro-ROS and ROS2 nodes, providing initial benchmarks that measure its temporal overhead. Second, we demystify how the DDS-XRCE and DDS Security specifications interact from a cybersecurity point of view.

Conclusions: by providing a custom encrypted transport for micro-ROS and ROS2 applications to communicate, extremely resource-constrained devices can now participate in DDS environments without compromising the security, privacy, and authenticity of their message exchanges with ROS2 nodes. Initial benchmarks show that encrypted single-value messages present around 20% time overhead compared to the default non-encrypted micro-ROS transport. Finally, we presented an analysis of how the DDS-XRCE and DDS Security specifications relate to each other, providing insights not present in the literature that are crucial for further investigating the security characteristics of combining these specifications.
A scoping review of the methodological quality of research on mental health of healthcare professionals in low- and lower-middle income countries
Authors: Lohmann Julia , John Denny , Dzay Aso
Published: July 2023

Background: SARS-CoV-2 has resulted in widespread awareness of health workers’ work realities and their mental health impacts, and corresponding unprecedented research effort. Reviews of the quantitative literature on mental health of clinical skilled healthcare personnel in low- and lower-middle income countries (LLMIC), however, point at quality issues in the pre-pandemic literature. We used the evidence generated in the context of one pre-pandemic review to understand methodological strengths and weaknesses in detail, with the aim of distilling recommendations for future research.

Methods: Our study used the literature identified in a systematic search from inception to the end of 2020, in English or French language, in MEDLINE, EMBASE, PsychINFO, Global Health, and CAIRN. Following a scoping review approach, we extracted and charted data on key study characteristics as well as on study quality. In regard to the latter, we developed nine quality criteria on the basis of existing quality checklists, but expanding on issues of particular relevance to the measurement and interpretation of levels of mental health or illness. We collated the charted data in descriptive fashion.

Results: We included data from 152 studies, which assessed a range of mental health outcomes, although most burnout. Most studies were conducted in India, Nigeria, Pakistan, or Egypt, in urban secondary- and tertiary-care settings. We judged only 20% of studies as of high quality due to shortcomings particularly regarding sample representativeness, context-specific measurement tool validity, and reporting of methodological detail.

Conclusion: We conclude that despite its impressive size, we can learn comparatively little from the body of literature up to the end of 2020 due to narrow study focus on specific settings and strong limitations in quality. Based on our findings, we outline areas for expansion, methodological improvement, and standardization of reporting in future research.

PROSPERO Registration: CRD42019140036.
Taxing the Rich to Finance Redistribution: Evidence from a Permanent Tax Increase in Singapore
Authors: Agarwal Sumit , Qian Wenlan , Yeung Bernard , Zheng Huanhuan
Published: July 2023

Based on a representative sample of consumer financial transaction data, this paper studies the consumption and savings response to a 2015 permanent increase in the marginal income tax of the high-income taxpayers. Using difference-in-differences regressions, controlling for individual and time fixed effects, we show robust results that the affected consumers experienced little change in their spending. The pattern is prevalent across consumer demographics and is found even among consumers who are sophisticated, have high levels of debt, or register little income changes. Furthermore, the tax increase financed fiscal redistribution leads to a long-lasting increase in the consumption of the lower-income population.

This paper was accepted by Lukas Schmid, finance.

Funding: The authors gratefully acknowledge financial support from Social Science Research Thematic Grant in Singapore [Future-Proofing Singapore: An Economic Approach MOE2019-SSRTG-024].

Supplemental Material: The data files are available at https://doi.org/10.1287/mnsc.2023.4823 .
COVID-19, es el momento de su reconocimiento pleno como enfermedad profesional
Authors: Benavides Fernando , Ramada José María , Delclós Jordi , Serra Consol
Published: July 2023

En un contexto de transición hacia el final de la pandemia, pensamos que es el momento o de reconocer como enfermedad profesional la COVID-19. Los pasos dados de reconocimiento como accidente de trabajo en sanitarios representan un avance, pero es insuficiente. Es un paso que ya ha recomendado recientemente la Comisión europea, para incluirla con el listado europeo de enfermedades profesionales, en todas aquellas actividades con un riesgo de infección demostrado. Esto supondría ventajas objetivas para las personas trabajadoras y las empresas.
Nutritional Assessment of Preschool Children Inhabiting at High Geographical Altitude in the Antofagasta de la Sierra Department, Catamarca, Argentina
Authors: Pacheco Agüero Rosario Elizabeth , Araya Franco Exequiel , Lomaglio Delia Beatriz
Published: July 2023

The growth and development of children are profoundly influenced by dietary habits, lifestyles, and environmental factors, which begin to shape early in ontogeny. In high-altitude populations, geographical stressors, such as permanent hypoxia, add further complexity and cannot be modified by human intervention. This study aimed to describe the nutritional status of preschoolers in a high-altitude area of northwestern Argentina.

A cross-sectional and descriptive study was carried out in 59 children aged 4 and 5 years from the towns of El Peñón and Antofagasta de la Sierra (3320 masl), Antofagasta de la Sierra department, Catamarca, Argentina. Anthropometric measurements, including weight (W), height (H), waist circumference, mid-upper arm circumference, and tricipital (T) and subscapular (S) skinfolds. Various indices and indicators, such as body mass index (BMI), waist-to-height ratio (WHtR), subscapular tricipital index (STI), and upper arm fat (UFA) and muscle area (UMA), were calculated. Additionally, the ratios of W/H, H/A (H for age), and BMI/A (BMI for age) were determined. Abdominal obesity was assessed using WHtR, and fat distribution was analyzed using STI. Protein and caloric reserves were estimated based on UMA and UFA, respectively.

The study revealed a low prevalence of low weight (3.7%) but a high prevalence of overweight (20.3%) and obesity (3.4%) among the evaluated preschool children. Notably, 30.0% of overweight children and 16.0% of normal weight children exhibited centralized fat distribution. Abdominal obesity was observed in 90.0% of overweight children and 42.2% of normal weight children. Stunting was also observed in 8.5% of the individuals. Additionally, a considerable prevalence of low caloric and protein reserves was identified.

These findings confirm the coexistence of deficit and excess malnutrition states, indicating a double burden of malnutrition, among the preschoolers of Antofagasta de la Sierra. Moreover, the study highlights the accumulation and distribution of abdominal and centralized fat as significant concerns in this population.
Improving Air Quality in Broiler Rooms Using an Electrostatic Particle Ionization System
Authors: Martel Myra , Kirychuk Shelley , Predicala Bernardo , Bolo Roger , Yang Yingjie , Thompson Brooke , Guo Huiqing , Zhang Lifeng
Published: July 2023

Highlights

An EPI system reduced PM and bacteria in broiler houses by up to 50% and 48%, on average, respectively.

The system had no significant effect on animal productivity.

The performance of the system decreased towards the end of the rearing cycle.

Abstract. Air quality in poultry operations is important for animal and human health. This study evaluated an electrostatic particle ionization (EPI) system for improving air quality in mechanically ventilated broiler rooms (11.7 m long, 6.4 m wide, and 2.9 m high), each with 800 birds. The study evaluated the impact of the EPI system on the levels of particulate matter (PM), ammonia (NH3), and hydrogen sulfide (H2S), as well as on animal performance. On average, the EPI system reduced PM fractions (PM1, PM2.5, PM4, PM10, and PM15) by approximately 50%. Average reductions for total PM and bacteria were 40% and 48%, respectively. No significant reduction was observed for NH3, and no measurable H2S was detected during the entire study period. No significant effects on feed conversion ratio and animal mortality were observed. Reductions in PM and total culturable bacteria decreased over time, which could possibly be due to increased contaminant concentration, ventilation rate, and accumulated dust on collection surfaces towards the end of the rearing cycle. Further assessments are required to determine if additional EPI units or collection surfaces could improve the efficiency of the system. Overall, the system reduced airborne PM and bacteria and improved the air quality in broiler houses. Keywords: Animal performance, Air quality, Bacteria, Broiler houses, Electrostatic particle ionization, Particulate matter.
"A Bit of Haze is Quite Indispensable Here": Creative Compromises and Narrative Clues in Nabokov's Letters to American Editors
Authors: Voronina Olga
Published: July 2023

Abstract: This paper challenges the myth of Nabokov's creative invincibility by addressing the writer's openness to editorial suggestions and even direct interferences in his work in the 1940-60s, the time of his early tentative exploration and, later, triumphant conquest of the American literary market. Grounded in a detailed analysis of Nabokov's correspondence with editors of American periodicals, the New Yorker and Playboy among them, it aims to compare the very Nabokovian project of educating an American reader to the unexpectedly long-term and involved process of his own "schooling" as an American writer. Since Nabokov was sometimes obliged to reveal his literary secrets to editorial teams in order to maintain the integrity and hidden complexity of his narrative patterns for a larger audience, the letters cited in this essay also clarify some enigmatic artistic choices in such works as Pnin and The Eye .
Ruslan and Lolita : Nabokov's Pursuit of Pushkin's Monsters, Maidens, and Morals
Authors: Lavine Ludmila Shleyfer
Published: July 2023

Abstract: The previously unexplored Russian precursor to Humbert's "kingdom by the sea"—Pushkin's mock-epic Ruslan and Liudmila ( RL )—permeates different layers of meaning in Lolita . An amalgam of Slavic and Western folklore that scandalized the reading public in its day, Pushkin's work underpins Nabokov's own transnational position as a writer, whose splash onto the Anglophone scene was accompanied by similar outcries of smut and pornography. In addition to a multitude of fairy-tale sources already documented in the scholarship, Lolita 's cluster of mermaids, sleeping beauties, dark magic, invisibility, pursuit and captivity, physical topography, and "brother"-rivals finds in Pushkin's RL a synthesizing intertext. Moreover, Pushkin's play with genre in RL guides Nabokov's in Lolita , oscillating between the frozen fairy-tale moment and the passage of time in a novel. Finally, RL provides a model for simultaneously subverting expectations of moral lessons from "fairy tales" while engaging ethics in the artistic process more fully than any didactic literature can. It is here where we can begin to address the care with which the author keeps Pushkin away from Humbert's world of references; the intricate ethics-aesthetics fusion that the author soaks up through his greatest Russian mentor cannot be available to an impostor-artist such as Humbert.
Mycobacterial Death and Resurrection: paradigm shifts in disease understanding
Authors: Cortas Chadi
Published: July 2023

ABSTRACT: This article examines two medical journal research articles on tuberculosis, one published in 1938 and the other in 2014. The two articles, which use animal models to understand aspects of tuberculosis mycobacteria survival in the lungs, rely on markedly different research and biotechnological techniques, reach somewhat opposite conclusions, and reflect different paradigms of tuberculosis pathogenesis: the 1938 article (indirectly invoking Koch’s postulates) was written before the paradigm of so-called “latent” and “reactivation” tuberculosis became widely adopted, while the 2014 article (indirectly invoking the molecular equivalents to Koch’s postulates) works within that paradigm but implicitly questions it. Despite this, both articles exhibit fascinating similarities in terms of how their authors tackled their research questions, formulated their results, and framed their research methodologies. These similarities reflect both the reliance on tenets of the scientific method but also the value of paradigms of disease causation. Using tuberculosis as an example, this article concludes with remarks about how disease paradigms evolve and can stimulate research that leads to advances in disease understanding.
Metasurface Doublet-Integrated Bidirectional Grating Antenna Using Dual Polarization For Efficient Wavelength-Controlled Beam Steering
Authors: Lee Woo-Bin , Bhandari Bishal , Choi Duk-Yong , Lee Sang-Shin
Published: July 2023

We demonstrate a metasurface doublet-integrated bidirectional grating antenna to mitigate the limitation of the beam steering range of the optical phased array. We show that a wavelength-controlled beam steering efficiency is improved by 0.888 deg/nm.
Low-loss adiabatic silicon chip-to-fibre couplers in the mid-infrared and applications to nonlinear optics
Authors: Sulway Dominic A. , Yonezu Yuya , Rosenfeld Lawrence M. , Jiang Pisu , Rarity John G. , Aoki Takao , Silverstone Joshua W.
Published: July 2023

Utilising novel, low-loss couplers (–0.58 dB), we characterise a potential TE0 pair-photon source via stimulated four-wave mixing in a phase-matched, air-clad 220 nm silicon waveguide. This is the lowest insertion-loss nonlinear behaviour characterised at 2 µm wavelengths.
Deep Transfer Learning for Nanophotonic Device Design
Authors: Kojima Keisuke , Jung Minwoo , Koike-Akino Toshiaki , Wang Ye , Brand Matthew , Parsons Kieran
Published: July 2023

Applying a transfer-learning technique for generative deep neural networks, we demonstrate a very time-efficient inverse design framework for photonic integrated circuit devices, when there are new demands for structural/material parameters from an existing device library.
Increasing the Q-Factor-Product and Efficiency of Raman Silicon Nanocavity Lasers Fabricated by Photolithography
Authors: Ota Yuji , Okano Makoto , Takahashi Yasushi
Published: July 2023

By optimizing a thermal treatment, the quality-factor-product and energy efficiency of a Raman silicon nanocavity laser fabricated by CMOS-compatible processes are improved by factors of 2.4 and 13, respectively, compared to the previously reported values.
Elongated fiber abrupt-tapered interferometers for High sensitivity strain sensors
Authors: Zhou Haimiao , Peng Ya-Pei , Suo Lina , Yao Cheng-Kai , Lu Xinhe , Chen Nan-Kuang
Published: July 2023

We demonstrate high sensitivity fiber strain sensors based on an elongated abrupt taper. The measured best strain sensitivity was 118.77 pm/με and the coefficient of determination R2 of linear fitting exhibits high linearity.
Ultrafast Laser Systems for High Repetition Rate X-Ray Free Electron Laser Facilities
Authors: Hartl I.
Published: July 2023

The ultrafast laser systems required by modern high repetition X-ray free electron laser facilities for electron beam generation and manipulation, femtosecond timing distribution and pump-probe science experiments will be described.
Low noise Tm-fiber laser comb via nonlinear amplifying loop mirror
Authors: Lin Jincan , Zha Zimin , Liu Huanhuan , Zhou Jiaqi , Guo Hairun
Published: July 2023

We have setup an all polarization maintaining mode-locked Tm-fiber laser with nonlinear amplifying loop mirror, which is intrinsically of low noise and is readily for optical frequency comb applications at the onset of mid-infrared.
Controllable Spectral Peak Generation with Ultrashort Pulses using LCOS-SLM Spectral Filter
Authors: Kobata Sakiko , Kitajima Shotaro , Nishizawa Norihiko
Published: July 2023

Arbitrary controlled spectral peak generation was demonstrated using ultrashort pulse fiber laser and spectral filter with LCOS-SLM. The intense, sharp spectral peak with record high contrast up to 143 was successfully obtained.
Above 20-GHz repetition-rate, Kerr-lens mode-locked lasers
Authors: Kobayashi Yohei
Published: July 2023

We have developed very high repetition rate, Kerr-lens mode-locked oscillators by using Yb-doped ceramics as gain materials. We have demonstrated comb-tooth resolved spectroscopy and a resonant excitation of acoustic phonons in solids.
Absolute frequency measurement of an iodine-stabilized laser at 556 nm for laser cooling of Yb
Authors: Tanabe Yuto , Sakamoto Yuma , Kohno Takuya , Akamatsu Daisuke , Hong Feng-Lei
Published: July 2023

The precision spectroscopy of the iodine transitions at 556 nm will benefit research on Yb cold atoms owing to the frequency coincidence of the iodine hyperfine transitions and the 1S0-3P1 spin-forbidden transition of Yb. We perform Doppler-free spectroscopy of hyperfine structures of molecular iodine using the second harmonic of a 1112-nm diode laser.
Optically-Detected Continuous-Wave Temperature Sensing using RF-Dressed States of Electronic Spins in Diamond
Authors: Tabuchi Hibiki , Matsuzaki Yuichiro , Watanabe Hideyuki , Nakano Yuta , Tokuda Norio , Mizuochi Norikazu , Ishi-Hayase Junko
Published: July 2023

We propose and experimentally demonstrate highly-sensitive temperature sensing using continuous-wave optically-detected magnetic resonance of electronic spin state of nitrogen-vacancy centers in diamond dressed by a MHz-range radio-frequency fields.
Reducing the resources needed to implement quantum error correction codes using quantum multiplexing
Authors: Nishio Shin , Piparo Nicolò Lo , Hanks Michael , Munro William John , Nemoto Kae
Published: July 2023

Quantum error correction is an indispensable tool for quantum technologies. However, its implementation requires significant physical resources. Here, we reduce the number of two-qubit gates required to implement an error correction code using quantum multiplexing.
Optimal Encoding of Contextuality in Polarization Entangled Photon States
Authors: Ji Ming , Matsuyama Kengo , Iinuma Masataka , Hofmann Holger F.
Published: July 2023

It is shown that the simultaneous validity of seemingly contradictory statements about the linear and circular polarization of two photons is optimized by a careful adjustment of the balance between entanglement and local polarization.
Ultrafast Measurement of Femtosecond Time-bin Qubits Using Optimized Up-conversion Single Photon Detector
Authors: Kochi Yuta , Kurimura Sunao , Ishi-Hayase Junko
Published: July 2023

We developed and optimized the up-conversion single photon detector with the temporal resolution of 415 fs. Consequently, we successfully evaluated single-photon level pseudo time-bin qubits with their pulse interval of only 800 fs.
Polarization multiplexing of an ultrafast single-photon detector by optical Kerr gating
Authors: Kuwana Takahisa , Yabuno Masahiro , China Fumihiro , Miki Shigehito , Terai Hirotaka , Mosley Peter J. , Jin Rui-Bo , Shimizu Ryosuke
Published: July 2023

We develop an ultrafast single-photon detector with optical Kerr gating using a photonic crystal fiber. Adopting the polarization-multiplexing technique, we achieved the sub-picosecond resolution in the single-photon detection of each polarization mode.
Super Absorbing Germanium Metasurface with quasi-Bound States in the Continuum
Authors: Saadabad Reza Masoudian , Huang Lujun , Miroshnichenko Andrey E
Published: July 2023

Germanium is the proper material for fiber-optic communication due to low-intrinsic dissipative losses at the telecommunication C-band. But specific applications need stronger absorption. We demonstrate super-absorbing germanium metasurfaces designed by quasi-bound states in the continuum.
Microwave Hinge State in a Three-Dimensional Photonic Crystal Composed of Simple Cubic Lattices
Authors: Ashida Yuya , Yamashita Kenichi , Ueda Tetsuya , Wakabayashi Katsunori , Iwamoto Satoshi , Takahashi Shun
Published: July 2023

We demonstrated a higher-order topological state in a three-dimensional photonic crystal for microwave. Shifting a part of the structure by a half period in two orthogonal directions provided different Zak phases, forming a hinge state.
Precision time-domain spectroscopy of infrared waves
Authors: Jacob Philip , Weigel Alexander , Schweinberger Wolfgang , Buberl Theresa , Högner Maximilian , Karandušovský Patrik , Hofer Christina , Trubetskov Michael , Huber Marinus , Krausz Ferenc , Pupeza Ioachim
Published: July 2023

We demonstrate rapid electro-optic sampling of broadband mid-infrared waveforms using a dual-oscillator setup employing a narrowband, waveform-stable calibration signal obtained by intra-pulse difference frequency mixing. Sub-attosecond waveform jitter is obtained for 1-s integration time.
150 GHz single shot ultrafast imaging spectroscopy based on femtosecond laser
Authors: Kim Dae Hee , Hahm Ji-Won , Lee In-Jae , Lee Geon-Ho , Kim Seung-Woo , Kim Young-Jin
Published: July 2023

In this investigation, we propose a single-shot ultrafast imaging spectroscopy over 150 GHz based on femtosecond laser. Furthermore, we introduce an application of a phase spectroscopy for ultra-high resolution by utilizing nano-structure with proposed system.
Tomography of light in space, time, spectrum, and polarization
Authors: Plöschner Martin , Morote Marcos Maestre , Dahl Daniel , Mounaix Mickael , Light Greta , Rakic Aleksandar , Carpenter Joel
Published: July 2023

We present a technique for complete characterization of light in space, time, spectrum, and polarization using a spatial light modulator to display projective holograms and a single-mode fiber to route the projected light to photodiode/spectrometer.
Phase-Modulated Optical Interferometer with Time-Domain Analysis and its Application to Dynamic Displacement Measurement of Soft Tissue
Authors: Noda Yuki , Matsumoto Sora , Fujimori Mikiya , Tanaka Yosuke
Published: July 2023

We developed a phase-modulated optical interferometer based on time-domain analysis using a laser diode with a wavelength of 1.3 μm. Feasibility to measure the vibration of biological soft tissues was assessed by using gelatin sample.
Ultra-Stable, Continuous-Wave UV Light Source for Precision Thermometry
Authors: Pourjamal Sara , Lindvall Thomas , Fordell Thomas
Published: July 2023

An ultra-stable light source and optical detection set-up for high-precision measurements of 114Cd absorption lines is presented. The experimental setup for ultraviolet light at 326.2 nm is described with an aim toward primary thermometry.
Novel dual-mode photonic crystal waveguide for stable resonant excitation of quantum dots with high β-factor
Authors: Zhou Xiaoyan , Lodahl Peter , Midolo Leonardo
Published: July 2023

We propose a novel dual-mode photonic-crystal waveguide that realizes direct in-plane resonant excitation of the QDs, which exhibits a single-photon collection efficiency β>0.95 and impurity ε<5×10-3 over a broad spectral and spatial range.
Direct trapping of micro particles with a 2μm Tm-doped fiber laser
Authors: Mamuti Roukuya , Fuji Takao , Kudo Tetsuhiro
Published: July 2023

We report on opto-thermophoretic trapping of micro/nanoparticles with a 2 μm Tm-doped fiber laser. The infrared continuous-wave laser is directly and strongly absorbed by water solution, and the particles are migrated along the temperature gradient.
Optical trapping and manipulation of phase-change material nanoparticles
Authors: Kakuta Ryo , Pin Christophe , Sasaki Keiji
Published: July 2023

In this study, we performed optical trapping of VO2 nanoparticles. Because of the temperature-dependent nonlinear change of the VO2 refractive index, VO2 particles are stably trapped on a circular orbit around the laser focus.
Temperature insensitivity of emission wavelength of highly-stacked quantum dot laser fabricated on InP(311)B substrate with Bi atoms irradiation
Authors: Akahane Kouichi , Matsumoto Atsushi , Umezawa Toshimasa , Yamamoto Naokatsu , Tominaga Yoriko , Yanase Satoshi , Maeda Tomohiro , Sotobayashi Hideyuki , Kanno Atsushi
Published: July 2023

In this study, the effect of Bi irradiation during the crystal growth of quantum dot (QD) laser diodes (LD) by molecular beam epitaxy (MBE) was investigated. The QD-LDs grown with Bi irradiation exhibit a decrease in temperature dependence on the lasing wavelength.
High Optical Feedback Resistance of 1.55 μm 15-Layer-Stacked Quantum Dot Laser using InP(311)B Substrate
Authors: Matsumoto Atsushi , Akahane Kouichi , Umezawa Toshimasa , Yamamoto Naokatsu , Kanno Kazutaka , Naruse Makoto , Uchida Atsushi , Kanno Atsushi
Published: July 2023

In this study, we evaluated optical feedback resistance of a 1.55-μm quantum dot (QD) laser diode (LD). Compared to a commercial MQW Fabry-Perot LD, higher feedback resistance could be obtained in the QD-LD.
Temperature Dependence of Mid-infrared Emission Process of InAs/GaSb Superlattices Grown by MOVPE
Authors: Arai Masakazu , Maeda Koji , Iwakiri Yuto , Fujisawa Takeshi
Published: July 2023

The mid-infrared emission of InAs/GaSb superlattices grown by MOVPE was compared with the calculated spectrum by perturbation method. Above 90 K, the emission from higher energy transitions is larger than those from the lowest levels.
Electrode Thickness Dependence of GaAs based Photovoltaic Device Characteristics for Optical Wireless Power Transmission
Authors: Kushiyama Akira , Motomura Yuga , Nishioka Kensuke , Arai Masakazu
Published: July 2023

We experimentally investigated the mesh shaped electrode thickness dependence of GaAs based photovoltaic device under laser irradiation. Thick electrode was effective to increase the fill factor even under partial irradiation.
Near-field Analysis of VCSELs after HTOL test
Authors: Cheng Hao-Tien , Zhang Taixian , Yang Yun-Cheng , Liu Te-Hua , Wu Chao-Hsin
Published: July 2023

Investigation on the failure mechanisms of 850 nm vertical-cavity surface-emitting laser (VCSEL) chips in the high-temperature operating life (HTOL) stress tests are presented. Selected failed chips are put into further analysis to study their early failure mechanisms.
Proposal of ReLU activation function using III-V semiconductor membrane laser for optical neural network
Authors: Takahashi Naoki , Fang Weicheng , Xue Ruihao , Katsumi Shunto , Ohiso Yoshitaka , Amemiya Tomohiro , Nishiyama Nobuhiko
Published: July 2023

We propose programmable low-power-consumption optical ReLU activation function for the fully optical neural network. The optical-to-optical nonlinearity is realized using characteristics of semiconductor membrane laser on Si-platform, and it generates ReLU function with controllable threshold input power. Optical ReLU function using a GaInAsP membrane distributed reflector laser on Si was experimentally demonstrate.
III-V-on-Silicon-Nitride Mode-Locked Lasers
Authors: Cuyvers Stijn , Hermans Artur , Poelman Stijn , de Beeck Camiel Op , Haq Bahawal , Roelkens Gunther , Van Gasse Kasper , Kuyken Bart
Published: July 2023

We demonstrate heterogeneously integrated passively mode-locked lasers by microtransfer printing III-V semiconductor optical amplifiers on a silicon nitride photonic chip. A dense and low-noise optical comb is generated, enabling unparalleled precision for on-chip spectroscopy.
Natural hyperbolic plasmon polaritons in 2D materials
Authors: Yan Hugen
Published: July 2023

In-plane hyperbolic plasmon polaritons naturally exist in some 2D materials, which promise applications in on-chip photonics. In this paper, I'll show our investigation of such plasmons in WTe2 thin films through far-field infrared spectroscopy.
Exciton-phonon interactions in Janus WSSe
Authors: Erkılıç Ufuk , Wang Shengnan , Taniyasu Yoshitaka
Published: July 2023

Interactions of excitons with phonons determine the exciton dynamics in semiconductors. In this work, by investigating temperature dependence of exciton transition energies and linewidths, we revealed enhanced exciton-phonon interaction in monolayer Janus WSSe.
Raman Spectroscopy for 2-Dimensional Materials Research
Authors: Cheong Hyeonsik
Published: July 2023

Raman spectroscopy is a powerful tool to study various physical properties of 2-dimensional (2D) materials. It is routinely used to determine the number of layers, polytypes, and crystallographic directions and to estimate doping or strain in various 2D materials. Its use is further expanded to investigate magnetic ordering in ferromagnetic or antiferromagnetic materials. On the other hand, strong resonance effects induce peculiarities in the Raman spectra that are often misinterpreted by non-specialists. This tutorial is intended for people who use Raman spectroscopy or interpret Raman data in their research but are not Raman specialists. I will review some typical applications of Raman spectroscopy in 2D materials research with specific examples.
Observation of Moiré Exciton Dynamics in Twisted MoSe2-WSe2 Heterstrobilayer
Authors: Kim Heejun , Aino Kumpei , Shinokita Keisuke , Zhang Wenjin , Watanabe Kenji , Taniguchi Takashi , Matsuda Kazunari
Published: July 2023

We have studied the moiré excitons with bright and dark states by using a temperature-dependent and time-resolved photoluminescence spectroscopy in twisted MoSe2-WSe2 heterobilayer. The dynamics of moiré excitons has been revealed.
Minimally-Invasive Lensless Computational Microendoscopy
Authors: Foster Mark A.
Published: July 2023

The distal lens is the primary limitation to the invasiveness of microendoscopes. Here we demonstrate a distal lens-free microendoscope that simultaneously achieves miniaturization and exceptionally wide FOV as well as volumetric imaging with computational refocusing.
Quantification of Natural Killer Cell Activation using Lens-free Shadow Imaging Technology
Authors: Lee Ahyeon , Lee Inha , Shin Sanghoon , Kumar Samir , Baik Minyoung , Jun Hyun Sik , Seo Sungkyu
Published: July 2023

This study presents a novel method for measuring natural killer(NK) cell activity using 470 nm LED light and a CMOS sensor. By measuring the NK cell activity, we can prepare for weakened immunity and diseases.
Highly Efficient Assembly of Bacteria by Portable Optical Condensation System with Multiple Compact Laser Modules
Authors: Iida Takuya , Hayashi Kota , Suehiro Taichi , Yamamoto Yasuyuki , Tamura Mamoru , Ishikura Ryota , Sakurai Kenji , Tokonami Shiho , Washida Hirohito , Yamasaki Tsutomu , Ishikawa Hiroki
Published: July 2023

We developed a portable optical condensation system with multiple compact laser modules, and demonstrated highly efficient light-induced assembly. Remarkably, we succeeded in light-induced assembly of bacteria beyond 105 cells within a few minutes.
3D Laser Nanoprinting: Recent Progress
Authors: Wegener Martin
Published: July 2023

Two-photon 3D printing has become a mature technology. Here, we review our efforts on using two-step absorption instead of two-photon absorption. The approach works with low-power continuous-wave laser diodes. We present one- and two-color results.
Experimental Demonstration of Deformation Robust Flexible Flat Optics for the Visible
Authors: Burguete-Lopez Arturo , Makarenko Maksim , Wang Qizhou , Getman Fedor , Fratalocchi Andrea
Published: July 2023

We present experimentally realized flexible flat optics polarizers for the visible range. We show that upon curving the devices, their polarization efficiency is maintained within 5% with an 85% maximum efficiency.
Demonstration of THz wireless transmission using cost-effective directly modulated laser for real-time ultra high definition video streaming service
Authors: Kim Eon-sang , Moon Sang-rok , Sung Minkyu , Lee Joon Ki , Cho Seung-hyun
Published: July 2023

We demonstrate a seamless UHD video streaming service over a cost-effective directly modulated DFB-LD-based terahertz wireless link with more than 2-m link distance. The uncompressed 4K video signals were successfully transmitted with no black frames.
THz and photonics convergence for future access links
Authors: Kawanishi Tetsuya
Published: July 2023

We review seamless networks consisting of THz radio and optical fiber links. Transmission distance of THz links is shorter than 1km, but is longer than typical radii of small cells for future mobile networks.
5G Wireless-Optical Signal Converter Using Antenna-Coupled Electrode Electro-Optic Modulator and WDM Add/Drop Filters
Authors: Miyazaki Hiroto , Yokohashi Hiroto , Murata Hiroshi
Published: July 2023

A 5G wireless-optical signal converter module is fabricated using an antenna-coupled electrode electro-optic modulator and WDM add/drop filters. This is suitable for a passive signal converter for up-link in mobile front-hauls in dense user environment.
Spectral phase interferometry for direct electric-field reconstruction of synchrotron light
Authors: Fuji Takao , Fujimoto Masaki , Okano Yasuaki , Salehi Elham , Hosaka Masahito , Katoh Masahiro
Published: July 2023

Ultraviolet electric-fields produced by relativistic electrons in an undulator of a synchrotron light source is characterized by using spectral phase interferometry for direct electric-field reconstruction. A 10-cycle rectangular shaped waveform is reconstructed.
Timing stabilization and diagnostic of femtosecond optical laser system for pump-probe experiments in SACLA
Authors: Togashi Tadashi , Kubota Yuya , Owada Shigeki , Katayama Tetsuo , Sueda Keiichi , Yabuuchi Toshinori , Tono Kensuke , Yabashi Makina
Published: July 2023

A synchronized femtosecond laser system, which is controlled by a balanced optical-microwave phase detector (BOMPD), was constructed for pump-probe experiments at SACLA and has been successfully realized to reduce jitter down to 50 fs.
CEP stabilization of a TiS CPA system to sub-100 mrad level
Authors: Nishimiya Kaito , Kubomura Kento , Ishikawa Ryoma , Suda Akira
Published: July 2023

We have suppressed the effects of vibration and acoustic waves on the CEP and obtained a CEP stability of 99 mrad (rms) with a pulse energy of 7 mJ at 1 kHz.
Ultrafast snapshot imaging at sub-GHz framerate by using recirculation filtering of ultrashort optical pulses
Authors: Honda Asami , Tamemoto Ryota , Yamane Keisaku , Suzuki Masato , Toda Yasunori , Omatsu Takashige , Morita. Ryuji
Published: July 2023

We successfully demonstrated ultrafast snapshot imaging based on time-to-frequency mapping method with four frames and ~ 5.5 ns time interval (i.e. sub-GHz framerate) by using our newly-developed recirculation system without ultrafast image sensor.
High-dynamic-range nondestructive testing promoted by 200 W peak-power backward terahertz-wave parametric oscillator
Authors: Nawata Kouji , Takida Yuma , Notake Takashi , Minamide Hiroaki
Published: July 2023

We demonstrated backward terahertz-wave parametric oscillator with a high peak-power of about 200 W at 0.3 THz via cascaded parametric down-conversion process. Terahertz-wave imaging was performed using the developed source for high-dynamic-range nondestructive testing.
High-power Narrow-line Far-infrared Parametric Source
Authors: Wu Ming-Hsiung , Kuo Chang-He , Chen Chieh-Ru , Huang Yen-Chieh
Published: July 2023

We report the generation of narrow-line far-infrared radiation with 100-kW and 142-kW peak powers at 5.7 THz external and internal to a Si prism coupler atop a KTP crystal as a pulsed difference frequency generator.
Generation of the Highest Laser Intensity of 1023 W/cm2 by Focusing PW Laser Pulses
Authors: Yoon Jin Woo , Choi Il Woo , Sung Jae Hee , Lee Hwang Woon , Lee Seong Ku , Nam Chang Hee
Published: July 2023

We report a demonstration of laser intensity exceeding 1023 W/cm2 with the CoReLS petawatt laser. After wavefront correction and tight focusing with a two-stage adaptive optics system and an f/1.1 (f=300 mm) off-axis parabolic mirror, we obtained a focal spot of 1.1 μm (FWHM). From the measurement of 80 consecutive laser shots at 0.1 Hz, we achieved a peak intensity of (1.1±0.2)×1023 W/cm2. This achievement will enable us to explore strong-field quantum electrodynamics phenomena.
Suppression of the temporal noise in SULF-10 PW laser
Authors: Xu Yi , Wang Xinliang , Bai Peile , Hu Jiabing , Zhang Zongxin , Liu Yanqi , Yu Lianghong , Liang Xiaoyan , Leng Yuxin , Li Ruxin
Published: July 2023

In SULF-10 PW laser facility, different methods are adopted to suppress different kinds of noise. Nonlinear pulse temporal filter based cascaded XPWG and fs-OPA techniques is utilized to suppress the ASE noise. While novel multi-pass amplifiers with wedged Ti:sapphire crystals are employed to suppress the pre-pulses in both nanosecond and picosecond domain. Applying these methods, temporal contrast about the ASE noise and the pre-pulses can reach 10-11 and 10-10 in SULF-10 PW laser, respectively.
A Comparison of Linear Regression and Deep Learning Model for EVM Estimation in Coherent Optical Systems
Authors: Fan Yuchuan , Pang Xiaodan , Udalcovs Aleksejs , Natalino Carlos , Zhang Lu , Spolitis Sandis , Bobrovs Vjaceslavs , Schatz Richard , Yu Xianbin , Furdek Marija , Popov Sergei , Ozolins Oskars
Published: July 2023

We experimentally investigate EVM estimation approaches based on linear regression and deep learning for 28 Gbaud coherent optical systems. We show that the estimation performances are comparable when the modulation format is known.
On-chip chiral-field-enhanced Raman optical activity for biosensing
Authors: Xiao Ting-Hui , Luo Zhengyi , Hiramatsu Kotaro , Isozaki Akihiro , Itoh Tamitake , Cheng Zhenzhou , Nomura Masahiro , Iwamoto Satoshi , Goda Keisuke
Published: July 2023

We demonstrate on-chip chiral-field-enhanced Raman optical activity (ROA) by tailoring a dark mode excited in a silicon nanodisk array. We show >100x enhanced chiral light-molecule interaction with negligible artifacts for ROA measurement of biological enantiomers.
Over-one-octave PM hollow-core anti-resonance fiber with ultralow polarization-mode coupling
Authors: Luo Zhuozhao , Huang Jiapeng , Zheng Yu , Huang Zhiyuan , Yin Ruochen , Wang Xiaocong , Yu Haihu , Jiang Xin , Pang Meng
Published: July 2023

A hollow-core anti-resonance fiber, featured with an elliptical-core structure, was fabricated and characterized, exhibiting broad-bandwidth (>900 nm), robust polarization-maintaining performance with ultra-low h-parameter of 10−8 m−1.
Detection of PM 2.5 Particulates using a Snap-Shot Hyperspectral Imaging Technology
Authors: Mukundan Arvind , Hong-Thai Nguyen , Wang Hsiang-Chen
Published: July 2023

In this paper, visible light hyperspectral imaging technology combined with VGG-16 to estimate PM2.5 concentration in images captured aerially using three different methods; RGB, Principal component Analysis, and 3D-CAE, and their accuracy is compared.
Observation of high-order Laguerre-Gaussian beams from a diamond Raman laser
Authors: Chen Hui , Zhang Yu , Guo Hongwei , An Jiashuo , Bai Zhenxu
Published: July 2023

We report on the direct generation of LG0,m modes Stokes laser with m tunable range of 0-9, for the first time to our knowledge, in an external-cavity diamond Raman laser using Gaussian beam pumping.
Spin-isolated Meta-Holographic Displays at Broadband UV-VIS Regimes
Authors: Asad Aqsa , Khaliq Hafiz Saad , Mahmood Nasir , Mehmood Muhammad Qasim , Massoud Yehia
Published: July 2023

A planar multi-functional meta-surface is designed to reproduce spin-isolated meta-holographic displays at broadband wavelengths covering ultraviolet (UV) and visible (VIS) regimes. The proposed metasurface can have potential application in data-encryption, advertisement industry, sensing etc.
PCA and Raman spectroscopy for discrimination of biological tissues and estimation of the basis for discrimination
Authors: Tadamasa Hayata , Minamikawa Takeo , Terao Yoshiki , Hori Koshirou , Yasui Takeshi
Published: July 2023

We developed a Raman spectral analysis method to estimate the basis for discrimination by using principal component analysis, which leads to the development of a reliable discrimination method of biological tissues.
Line-illumination Raman microscopy for imaging biological samples
Authors: Fujita Katsumasa
Published: July 2023

We developed Raman microscopy techniques for rapid imaging of biological cells and tissues. By detecting Raman spectra simultaneously from multiple points in a specimen, which is irradiated by a line-shaped laser focus, the image acquisition time has been improved hundreds of times compared to a conventional confocal Raman measurement. We utilized several types of laser illumination for different imaging purposes, such as high-speed, high-resolution, and depth imaging of biological samples. We also applied the Raman microscopy techniques for characterizing and diagnosing the biological states and functions of cell and tissue samples.
Metal Ion Dynamics Imaging Based on Surface Plasmon Resonance Microscope
Authors: Tanaka Hirokazu , Masui Kyoko , Tero Ryugo , Ishitobi Hidekazu , Refki Siham , Sekkat Zouheir , Inouye Yasushi
Published: July 2023

We have developed a non-invasive and high-resolution imaging method for the two-dimensional dynamics of metal ions in the vicinity of cells based on Surface Plasmon Resonance Microscope.
Demonstration of Coherent Transceiver for Visible-Wavelength Applicable to Communication and Doppler Lidar Systems
Authors: Tamada Akihito , Ito Yusuke , Imaki Masaharu , Kameyama Shumpei
Published: July 2023

The coherent transceiver for visible wavelength is demonstrated. Successful heterodyne-detection is shown including the Doppler shift detection. The experimental results indicate the future possibility for the coherent communication and Doppler lidar for underwater applications.
A design of high NA reflective objective for DUV micro-spectroscopy
Authors: Takehara Hikaru , Sasaki Keiji , Taguchi Atsushi
Published: July 2023

Reflective objective is widely used for DUV micro-spectroscopy, however, the NA of reflective objective is limited typically up to 0.6. We designed DUV reflective objective with NA as high as 1.30 using glycerin as immersion.
64 × 64 spot-array generation based on freeform optics
Authors: Wang Haoqiang , Zang Zihan , Xu Yunpeng , Han Yanjun , Li Hongtao , Luo Yi
Published: July 2023

A 64×64 spot-array generator using freeform surface is proposed. The Monte Carlo ray tracing simulation shows that the overall efficiency can be as high as 89% and a unique broadband performance can be obtained.
Intracavity Lithium Niobate Electro-Optic Modulator for External Cavity Laser Fast-Servo Feedback
Authors: Palmer S. , Boes A. , Nguyen T. , Mitchell A. , Scholten R.E.
Published: July 2023

We demonstrate laser frequency modulation using a small intracavity electro-optic modulator. The high bandwidth of our modulator (13.5 MHz) allows for superior frequency stabilization and linewidth narrowing (<1 kHz) when compared to diode injection current modulation.
Optical Field Control of Electron Dynamics in WSe2 monolayer
Authors: Hashmi Arqum , Yamada Shunsuke , Yamada Atsushi , Yabana Kazuhiro , Otobe Tomohito
Published: July 2023

By using time-dependent density functional theory (TDDFT) with spin-orbit interaction (SOI), laser intensity dependence of the valley pseudospin and light propagation in terms of the transmitted and reflected high harmonic generation (HHG) is investigated.
Applications of Frequency Comb in Nanotechnology, Industry, and Space Technology and More
Authors: Kim Seung-Woo
Published: July 2023

Acting as a frequency synthesizer with direct traceability to the microwave and/or optical clocks, the optical frequency comb of an ultrashort laser leads breakthroughs in diverse metrological applications in entire optical regime including terahertz waves.
Frequency Comb-to-comb Synchronization through Atmospheric Optical Frequency Transfer over a 1.3-km Free-space
Authors: Lee Dong IL , Yang Jaewon , Shin Dong-Chel , Kim Young-Jin , Kim Seung-Woo
Published: July 2023

We present a1.3-km free-space optical link system stabilizing two frequency combs located in different places. Frequency stability of 1.07×10–15 at 1.6 s integration is achieved across the entire spectrum.
Shape sensing based on dual-comb demodulation of a fiber Bragg grating sensing array
Authors: Yang Jianjun , Liu Jiansheng , Yu Baorui , Ma Minghui , Hu Jingyuan , Shao Hongfeng , Zhao Xin , Zheng Zheng
Published: July 2023

A system for realizing shape sensing based on the single-cavity dual-comb spectroscopy technology and a dense all-identical fiber Bragg grating (FBG) sensor array is demonstrated. High spatial resolution and small measurement error can be realized with the proposed system, based on two-dimensional shaping sensing experiments. This scheme could find applications in real-time monitoring of flexible structures and facilitate the development of novel robotics and biomedical devices.
Simultaneous Measurement of Refractive Index and Lens Surface Spacing in Optical Systems by Dual-Comb Ranging
Authors: Lin Chen , Zhou Siyu , Zhang Ruixue , Wu Guanhao
Published: July 2023

We present a method to measure the refractive index and lens surface spacing in optical systems simultaneously by dual-comb ranging. The repeatability precision of thickness and refractive index is better than 0.18 μm and 1.6×10-4 .
Shape Measurement Technique with Self-correction of Air Refractive Using a Single-color Comb Interferometer
Authors: Tanaka Takuho , Akuzawa Kanyo , Kato Takashi , Minoshima Kaoru
Published: July 2023

We developed a technique for precise shape measurements over a long distance in air. We achieved self-correction of air refractive index fluctuation with 3-µm uncertainty over 61-m using two-color method with single-wavelength optical frequency comb.
Applications of solid state optics in information technologies
Authors: Yang Sen
Published: July 2023

Solid state optics is a broad field with a wide range of applications from industry to research. Here, I will show several research developments in quantum applications as well as classical counterpart.
Three-photon time-bin entanglement generation using an optical switch
Authors: Lo Hsin-Pin , Ikuta Takuya , Azuma Koji , Honjo Toshimori , Munro William J. , Takesue Hiroki
Published: July 2023

We realized the first three-photon time-bin GHZ states using a 2×2 optical switch as a time-dependent beam splitter to entangle a photon from a weak coherent light and a photon from a time-bin entangled photon pair.