bluuebunny/crossref_metadata_2025 huggingface dataset:
A Novel Ultra-high Q Buckle-free Large Silica Rib Microdisk with Sub-Micron Thickness
Authors: Honari Shahin , lu Tao
Published: July 2023

In this work we demonstrate a novel buckle-free 1-millimeter-diameter silica rib microdisk with sub-micron thickness. Using this geometery, an optical quality factor as high as 1.2×107 at 970 nm wavelength is reported.
Off-axis Excitation of Electromagnetically Induced Transparency-like Resonances in the Mid-Infrared Wavelength Range
Authors: A.S. Lal Krishna , Raghunathan Varun
Published: July 2023

We experimentally demonstrate off-axis excitation of EIT-like resonances with Q-factor of 360 in the mid-infrared wavelength range through the interaction of guided-mode and quasi-bound states in continuum resonance branches in one-dimensional amorphous-silicon sub-wavelength grating structures.
Topological modes observed in Si photonics SSH integrated circuit
Authors: Nakamura R. , Nakama T. , Balčytis A. , Ozawa T. , Ota Y. , Iwamoto S. , Ito H. , Baba T.
Published: July 2023

We fabricated a sophisticated Si photonic integrated circuit for investigating topological photonics SSH model. In the selective excitation and observation of SSH coupled microrings, we observed the wavefunctions of edge and bulk modes.
Practical Implementation of Kerr Modulators in Silicon in the 2-micron Band
Authors: Radulovic M. , Sayers B.D.J. , Currie S.G. , Dominguez D.A. Quintero , Silverstone J.W.
Published: July 2023

We design and implement a variety of silicon photonic modulators based on the electro-optic Kerr effect, operating at 2 microns wavelength and consider practical details of their application within quantum photonics.
Experimental demonstration of all optical switching using nonlinear multimode interference coupler fabricated with Ta2O5 thin film
Authors: Lin Yuan-Yao , Yang Shih-Er , Deng Yu-Lin , Lee Chao-Kuei , Chiu Yi-Ren
Published: July 2023

Multimode interference (MMI) couplers were fabricated by Tantalum pentoxide (Ta2O5) thin film grown with e-beam evaporation routes. All optical switching based on nonlinear MMI was experimentally demonstrated under ps laser pulse at sub-nJ energy level.
Silicon Nitride Material Integration for Enhanced Photonic Functionalities
Authors: Bucio Thalía Domínguez , Skandalos Ilias , Vitali Valerio , Mastronardi Lorenzo , Rutirawut Teerapat , Hillier James , Kalfagiannis Nikolaos , Petropoulos Periklis , Gardes Frederic Y.
Published: July 2023

We demonstrate a novel material integration scheme for the realisation of wave-length division multiplexing devices in the O-band and discuss advanced fabrication meth-ods for the realisation of nonlinear devices for all-optical processing in the C-band.
High Quality Factor Deuterated Silicon-Rich Nitride Micro-Ring Resonators
Authors: Chia X. X. , Xing P. , Choi J. W. , Tan D. T. H.
Published: July 2023

Micro-Ring Resonators were fabricated on Deuterated Silicon-Rich Nitride films and characterised. Fabricated devices yield intrinsic quality factors of up to 127,000 and propagation losses of less than 2 dB/cm.
Single soliton generation with deuterated SiN ring resonator fabricated at low temperature
Authors: Aihara Takuma , Hiraki Tatsurou , Nishi Hidetaka , Tsuchizawa Tai , Matsuo Shinji
Published: July 2023

We demonstrate single soliton generation in a SiN ring resonator using deuterated SiN film deposited at low temperature. The results show that comb generators can be integrated in photonic integrated circuits by using the back-end-on-line process.
Enhancement of Fiber-to-Waveguide Coupling Efficiency of Silicon Nitride Integrated Optical Circuits
Authors: Zhu Xiaotian , Li Guangkuo , Li Yuhua , Wang Xiang , Davidson Roy , Little Brent E. , Chu Sai T.
Published: July 2023

A hybrid approach for the enhancement of the fiber-to-silicon nitride waveguide coupling efficiency is proposed. It shows the coupling efficiency of lower than 0.7 dB/facet across the C band can be achieved.
Latest Progress in Optical Eigenvalue Communications - Dispersion Managed Soliton Case -
Authors: Maruta Akihiro , Endo Hiroki
Published: July 2023

Eigenvalue of dispersion managed (DM) soliton is investigated based on the inverse scattering transform by focusing the anomalous dispersion fiber section. The DM soliton has a discrete eigenvalue which is invariant over long distance. So even in DM transmission system, optical eigenvalue communication can be realized.
Informed learning of spectral super-resolution for mHealth applications
Authors: Ji Yuhyun , Park Sang Mok , Kim Young L.
Published: July 2023

An informed learning approach can be used to overcome the limitations of purely data-driven machine (statistical and deep) learning of spectral super-resolution or hyperspectral recovery and allows for noninvasive mobile health (mHealth) point-of-care diagnostics using the smartphone camera.
Thermo-optic refraction interferometry for milk turbidity estimation using optical vortex beam
Authors: Shetty Pritam P , Bingi Jayachandra
Published: July 2023

A new interferometric method called thermo-optic refraction interferometer (TORI) is proposed. Two optical fields out of which one carries vortex phase are passed through turbid media i.e., milk and their interferograms are analyzed.
Estimation of Finger Force by Nail Color Change and Measurement of Capillary Refilling by Finger Pressure
Authors: Nagasawa Takumi , de Souza Raquel Pantojo , Iwata Kazuki , Ogawa-Ochiai Keiko , Tsumura Norimichi , Cardoso George C.
Published: July 2023

We propose a method for measuring capillary refill time based on skin color changes after releasing finger pressure on the forearm using an RGB camera. We also estimate the finger force from the fingernail color.
Modelling of CW cavity-enhanced diamond Raman laser
Authors: Li Muye , Kitzler Ondrej , Spence David J.
Published: July 2023

We build the model of continuous-wave resonantly pumped Raman lasers. The experimental results of the ring cavity diamond Raman laser show the first Stokes and second Stokes output consistent with the theoretical predictions. The imperfect mode-matching is included in the model and the optimization of input and output coupler reflectivity is derived.
Regenerative DFB lasing from new silicone elastomer waveguide for printable and imprintable optics fabrication
Authors: Takagoshi Daichi , Nakakubo Keisuke , Obata Nasim , Kotani Takuji , Yoshioka Hiroaki , Oki Yuji
Published: July 2023

Regenerative dye lasing was demonstrated using new polydimethylsiloxane-based core, with high solubility and thermoplasticity. Furthermore, dry-diffusion of dye-molecules observed in the material. PDMS substrate as a dye-reservoir post-doped dye into core, and regenerative lasing achieved.
Generation of circular geometric modes from Pr3+:YLF laser with spherical aberration
Authors: Rao A. Srinivasa , Morohashi Takuya , Miike Taku , Miyamoto Katsuhiko , Omatsu Takashige
Published: July 2023

We report on, for the first time, direct generation of circular geometric modes from a Pr3+:LiYF4 (Pr3+:YLF) laser cavity with an intra-cavity plano-convex lens.
Intra-Cavity Spiral Phase Plate Laser with Non-Inverting Sagnac Mirror
Authors: Kerridge-Johns William R.
Published: July 2023

We propose and experimentally demonstrate intra-cavity spiral phase plate use with a non-inverting Sagnac mirror. The Nd:YVO4 laser yielded high purity (>95%) LG01 and LG02 vortex output. The laser mode self-adapted to optimise LG01 purity, minimizing higher order radial mode production characteristic of external SPP use.
Transient refraction spectroscopy with double attosecond pulses in inner-subshell electron
Authors: Mashiko Hiroki , Oshima Akihiro , Chen Ming-Chang , Katayama Ikufumi , Takeda Jun , Oguri Katsuya
Published: July 2023

We characterized complex dynamics in argon atomic inner-subshell electron by transient refraction spectroscopy with double attosecond pulses (two isolated attosecond pulses). By obtaining intensity and phase with the spectral interferometry, the complex dynamics was revealed.
Extreme Ultraviolet Transient Absorption Spectroscopy for Probing Femtosecond and Attosecond Dynamics
Authors: Loh Zhi-Heng
Published: July 2023

High-order harmonic generation of ultrashort extreme ultraviolet (XUV) pulses has enabled the core-level absorption probing of femtosecond to attosecond dynamics. The underlying principles and recent applications of ultrafast XUV transient absorption spectroscopy will be introduced.
Laser-Assisted Synthesis and Processing of 2D Quantum Materials
Authors: Mahjouri-Samani Masoud , Azam Nurul , Jaiswal Suman , Ahmadi Zabihollah , Fathi-hafshejani Parvin
Published: July 2023

Two-dimensional (2D) materials such as transition metal dichalcogenides (TMDCs) have recently emerged as an exciting class of quantum materials that can enable technological advancement in various fields, including electronics, optoelectronics, and photonics. Therefore, there is a significant demand for high-quality crystal growth and wafer-scale integration methods to transition their exciting properties from lab to fab. Here, I will discuss some of the laser-based synthesis techniques we have developed to control the growth of both single-crystalline 2D flakes and large-scale polycrystalline 2D films for wafer-scale electronics. I will report the synthesis of the highest-quality single-crystalline monolayers using the laser-assisted vapor phase growth method directly from stoichiometric powders. I will particularly highlight our condensed phase growth approach compatible with direct laser writing as well as the conventional lithography and device integration technologies. Patterned integration of 2D materials on both flexible and rigid substrates will be demonstrated. The crystal structures, quality, and device performance will also be discussed and compared with the common growth methods. These laser-based approaches provide unique synthesis and processing opportunities that are not easily accessible through conventional methods.
Polarizing optical elements fabricated by laser induced periodic surface structures
Authors: Tasolamprou Anna C. , Skoulas Evangelos , Kenanakis George , Stratakis Emmanuel
Published: July 2023

We present a method for the realization of wire grid polarizing metasurface plates operating in transmission at IR and mid-IR exclusively via laser structuring, i.e., laser induced, periodic surface structures formed on nanometer-thick metallic films.
Investigation of the effect of grating profile on the precision of 2D single-shot comb-based interferometer
Authors: Bao Dinh Thai , Chiba Keishi , Tuan Truong Cong , Shioda Tatsutoshi
Published: July 2023

The research theoretically analyzes the system specifications and designs the experiment to verify the effect of the discrete profile of the grating on the profilometry precision of the novel 2D single-shot comb-based interferometer.
Circular Polarization Switching in Dual-comb Spectroscopy using Coherent-controlled Multi-comb Pulses towards Circular Dichroism Characterization
Authors: Zhu Ruichen , Asahara Akifumi , Kato Takashi , Tian Haochen , Minoshima Kaoru
Published: July 2023

We realize circular polarization switching in polarization-modulated dual-comb spectroscopy. The amplitude and phase spectral changes are evaluated, and well-balanced circular switching is verified. The developed system is expected to be useful in circular dichroism characterizations.
RF frequency response measurement for broad-bandwidth optoelectronic devices based on a dual-comb laser
Authors: Jiang Siyi , Yang Jianjun , Zhou Quan , Liu Jiansheng , Zhao Xin , Zheng Zheng
Published: July 2023

Ultrashort pulses generated by a dual-comb mode-locked fiber laser are leveraged for fast broadband microwave frequency response measurement for large-bandwidth optoelectronic devices. Using an all-fiber-optic design, devices with tens of GHz bandwidth can be measured without high-frequency microwave devices.
Electro-optical Dual-Comb Spectroscopy: Application to Cavity Ring-Down, Mode Width and Mode Dispersion Measurements
Authors: Charczun D. , Lisak D. , Nishiyama A. , Voumard T. , Wildi T. , Kowzan G. , Brasch V. , Herr T. , Fleisher A. J. , Hodges J. T. , Ciuryło R. , Cygan A. , Masłowski P.
Published: July 2023

The advantages of dual-comb spectroscopy with the sensitivity of cavity-enhanced techniques has been combined in a new broadband approach. The experimental demonstration is completed by a comprehensive theoretical framework, underlining the potential of the techniques.
Photon-pair generation in standard silicon-on-insulator at 2 microns wavelength
Authors: Sulway Dominic A. , Currie Sebastian G. , Rosenfeld Lawrence M. , Silverstone Joshua W.
Published: July 2023

We demonstrate the first 2-micron photon-pair source on standard 220 nm silicon-on-insulator, using type-0 spontaneous four-wave mixing in the TE1 waveguide mode, and characterise it with efficient 2-micron superconducting detectors.
In situ detection of phase mismatching in optical parametric process for vacuum squeezing
Authors: Taguchi Yoshitaka , Ozeki Yasuyuki
Published: July 2023

We propose a method for detecting phase mismatching by using an optical sideband, which imprints a phase shift on the pump light. By measuring this phase shift, phase mismatching can be detected for feedback control.
Decomposition of high-order eigenmodes in plasmonic nanostructures using transmission matrix analysis
Authors: Jin Young-Ho , Oh Juntaek , Choi Wonshik , Kim Myung-Ki
Published: July 2023

We propose and demonstrate a near-field transmission matrix-based singular value decomposition for mapping the high-order eigenmodes of a 50nm spacing double-slot that, are invisible with conventional computation and NSOM measurements in 640nm.
Development of next generation superconducting nanostrip single photon detection technology
Authors: Miki Shigehito , Yabuno Masahiro , Miyajima Shigeyuki , China Fumihiro , Terai Hirotaka
Published: July 2023

Superconducting nanostrip single photon detectors (SNSPDs) have already utilized as promising single photon detectors in variety of applications. At the same time, great efforts have been paid for realizing next generation SNSPD technologies, enabling higher performance and higher functionalities. In the presentation, we will introduce the diverse research on next generation SNSPD technology, including superconducting digital readout circuit.
Development of halide perovskite photovoltaic devices towards high voltage performance
Authors: Miyasaka Tsutomu
Published: July 2023

Lead halide perovskite semiconductors shows a unique defect tolerance nature that enables high efficiency in photovoltaic power conversion. For enhancing efficiency, photovoltage is the important focus of improvement in terms of energy loss on bandgap energy. Our strategy to enhance voltage output towards theoretical limit levels by compositional engineering of heterojunction interfaces is presented for organic-inorganic hybrid and all-inorganic perovskites.
Integrated spatiotemporal circulator on thin-film lithium niobate platform
Authors: Russell Rebecca , Tan Mengxi , Boes Andreas , Dubey Aditya , Ren Guanghui , Huang Haijin , Frigg Andreas , Nguyen Thach , Mitchell Arnan
Published: July 2023

We report the simulation and experimental demonstration of an integrated electro-optic modulator based isolator/circulator on the lithium niobate on insulator optical waveguide platform, achieving 20dB theoretical and 9dB experimental isolation.
Optimized Design of Inductive-peaking Si Microring Modulator for Operating Bandwidth over 65 GHz
Authors: Kao Hsiang-Chih , Lin Ming-Wei , Lee Ming-Chang
Published: July 2023

We design a high-speed inductive-peaking Si microring modulator integrated with an on-chip spiral inductor to extend the 3dB operating bandwidth beyond 65GHz and increase the conversion gain by 5 dB. A 64Gb/s transmission is demonstrated.
Correlation between optical absorption and twisted angle of bilayer graphene observed by high-resolution reflectance confocal laser microscopy
Authors: Chan Ming-Che , Chen Yen-Chun , Shiue Bai-Heng , Tsai Tzi-I , Chen Chii-Dong , Tseng Wei-Shiuan
Published: July 2023

We report a systematic study of the optical absorption of twisted bilayer graphene across a broad range of twist angles from 0° to 30° firstly using a home-made, high-resolution reflectance confocal laser microscopy system.
Single-Neuron Stimulation with a Focused Femtosecond Laser
Authors: Segawa Yumi , Minoshima Wataru , Masui Kyoko , Hosokawa Chie
Published: July 2023

The less invasive stimulation of neurons at the single-cell level was demonstrated with a focused femtosecond laser. The evoked neuronal activity by the laser irradiation was evaluated by simultaneous fluorescent Ca2+ imaging and electrophysiological recordings.
Sensitive Detection of Biological Nanoparticles by Controlled Optical Force in Microflow
Authors: Fujiwara Kana , Takagi Yumiko , Tamura Mamoru , Nakase Ikuhiko , Tokonami Shiho , Iida Takuya
Published: July 2023

We succeeded in sensitive detection of biological nanoparticles by optical condensation in microflow system. Furthermore, we revealed that the detection range of biological nanoparticles can be controlled by changing the action range of optical force.
Polymer-Stabilized Silver Nanoparticles for Plasmonic Fluorescence Biosensing
Authors: Kato Ryo , Uesugi Mitsuhiro , Komatsu Yoshie , Okamoto Fusatoshi , Tanaka Takuo , Kitawaki Fumihisa , Yano Taka-aki
Published: July 2023

We developed novel polymer layers to facilely coat plasmonic metal nanoparticles to obtain strong net fluorescence intensity and employed the polymer-coated silver nanoparticles for highly sensitive biosensing based on plasmon-enhanced fluorescence.
Ultrasensitive Gas Refractive Index Measurement with Plasmonic Phase Spectroscopy using Frequency Comb
Authors: Nguyen Duy-Anh , Lee Geon-Ho , Shin Dong-Chel , Kim Seung-Woo , Kim Young-Jin
Published: July 2023

Phase-sensitivity plasmonic sensor has not been much explored because of the lack of a stable light source. Here, we demonstrate that frequency-comb-referenced plasmonic phase spectroscopy can be used for ultrasensitive gas refractive index measurement.
Development of Three-dimensional Arbitrary Optical Condensation Method with Fiber-based Module
Authors: Hayashi Kota , Tamura Mamoru , Fujiwara Masazumi , Tokonami Shiho , Iida Takuya
Published: July 2023

We developed photothermal fiber-based module coated with metallic nanofilm to demonstrate optical condensation at Three-dimensionally arbitrary positions. By using this module, the assembly efficiency was improved about twenty times in comparison with the conventional method.
High-frequency microwave generation using period-one dynamics of two mutually coupled semiconductor lasers
Authors: Tseng Chin-Hao , Liao Bin-Kai , Hwang Sheng-Kwang
Published: July 2023

We propose a novel photonic approach for microwave generation based on two mutually coupled semiconductor lasers. A 55-GHz microwave with a 3-dB linewidth below 3.6 kHz and a side-peak-suppression ratio of 45 dB is achieved.
3.5 µm fiber lasers
Authors: Ottaway David J. , Henderson-Sapir Ori
Published: July 2023

The introduction of dual wavelength pumping nearly a decade ago has made the 3.5 µm transition in erbium doped fluoride glasses viable. This has enabled a host of new lasers with interesting properties to be developed.
Highly-efficient CW Fe:ZnSe Laser Amplifier at ~4 μm
Authors: Li Enhao , Uehara Hiyori , Tokita Shigeki , Potemkin Fedor , Yasuhara Ryo
Published: July 2023

We present a high-efficiency CW Fe:ZnSe laser amplifier seeded by a 4-μm quantum cascade laser. The amplifier obtained a more than fourfold single-pass gain and a maximum extraction efficiency of over 30%.
Characteristics of Spectral Peaking in Ultrashort Pulse Fiber Lasers with Molecular Gas Cell
Authors: Nishizawa Norihiko , Kitajima Shotaro , Sakakibara Youichi
Published: July 2023

Characteristics of spectral peaking in fiber laser were investigated both experimentally and numerically. Ultrashort soliton pulse with multiple sharp spectral peaks were generated stably. The peak intensity was increased exponentially for the magnitude of absorption.
Ultrafast quantum-path interferometry to study decoherence time of electron-phonon coupled states in GaAs using polarized femtosecond pulses
Authors: Takagi Itsuki , Suda Masaki , Kayanuma Yosuke , Nakamura Kazutaka G.
Published: July 2023

Decoherence time of the electron-phonon coupled states in n-GaAs has been studied with ultrafast quantum-path interferometry using a pair of polarized 60-fs pulses with relative phase locking and quantum model calculations.
Population Manipulation with Chirped Pulses in InAs Quantum Dots with Resonators
Authors: Miyauchi Kotaro , Kinoshita Yutaro , Akahane Kouichi , Ishi-Hayase Junko
Published: July 2023

We demonstrate the robust population inversion of excitons with a large inhomogeneous broadening using chirped pulses in self-assembled InAs quantum dots embedded in optical resonator.
Ultrafast All-Optical Switching with High-Quality Graphene and its Polarization Effect
Authors: Kusaka Tomoki , Furube Akihiro , Katayama Tetsuro , Kishikawa Hiroki , Ohno Yasuhide , Nagase Masao , Fujikata Junichi
Published: July 2023

All-optical switching operation with spatial incidence and its polarization effect was investigated using the saturable absorption property of the graphene on SiC. 120fs ultrafast optical switching operation and about 8% absorption change could be achieved.
Nonlinear Eye Skew Equalizers for Directly-Modulated Laser based 400G-LR Transmission Systems
Authors: Lin Jyh-Kae , Chuang Chun-Yen , Liu Kuan-Hao , Huang Chin-Shih , Hsieh Hao-Chun , Pan Hung-Chun , Lee Tsung-Han , Kao Chia-Wei , Chen Jyehong
Published: July 2023

We propose two nonlinear eye-skew equalizers for 400G-LR4 transceivers using DMLs. After equalizers, the eye-skew is effectively reduced, and the system shows a 3.2 dB power budget improvement and more than 107 BER floor reduction.
Elimination of Nonlinear Distortion in DML-based OFDM Transmission Using Novel Pre-distortion
Authors: Huang Szu-Chi , Yu Yu-Cheng , Wei Chia-Chien , Huang Chin Shih , Hsieh Hao Chun , Pan Hung Chun , Ting Wei-Jo , Li Heng
Published: July 2023

Based on Volterra filtering, a novel pre-distortion method without significantly altering the transmitted spectra was proposed to eliminate nonlinear distortion in DML-based OFDM transmission. The scheme experimentally increased the capacity by >60% after 150-km transmission.
Control of Vector Beam Polarization Mode by Spatially Modulated Photonic-crystal Lasers
Authors: Kitamura Kyoko , Kotera Seira , Yone Masako , Yoshida Kazuaki , Noda Susumu
Published: July 2023

We demonstrate a single-chip vector beam generator by designing spatial modulation of modulated photonic-crystal lasers. The polarization modes of the output beam are controlled by mode selection of the laser.
Direct printing of organic micro-disk cavity lasers on waveguides in optical integrated circuits
Authors: Hiramoto Kota , Obata Nasim , Eich Alexander , Mikami Yuya , Nasir Abdul , Tate Naoya , Oki Yuji , Schuck Carsten , Yoshioka Hiroaki
Published: July 2023

We have used inkjet printing for integrating organic microcavity lasers vertically on top of optical waveguides embedded into photonic integrated circuits. This achievement will enable three-dimensional circuits and exploiting novel heterogeneous material combinations.
Strain-compensated type-II GaAs1−xBix/GaNyAs1−y “W” quantum wells for GaAs-based telecom lasers
Authors: Davidson Zoe C. M. , Rorison Judy M. , Sweeney Stephen J. , Broderick Christopher A.
Published: July 2023

We theoretically analyse strain-compensated GaAs1
−x
Bi
x
/GaN
y
As1
−y
“W-type” quantum wells, demonstrating a viable approach to achieve efficient GaAs-based 1.3 and 1.55 µm lasers in which non-radiative Auger recombination is expected to be mitigated by type-II band offsets.
Mutual Control of Heat-Light by Si Metasurface
Authors: Takahara Junichi , Xu Rongyang
Published: July 2023

We describe single crystalline silicon (c-Si) perfect absorbers (PAs) in visible and near-infrared region based on degenerate critical coupling. We show that not only dipoles, but also quadrupoles play an important role to realize PAs with higher Q-factor. In addition, we demonstrate switchable PAs by hybrid Si meta-atoms with metal-insulator transition materials of VO2.
Assembly of All-Dielectric Broadband Perfect Absorbers Based on Degenerate Critical Coupling
Authors: Xu Rongyang , Takahara Junichi
Published: July 2023

Previous studies about perfect absorbers based on degenerate critical coupling only achieved narrowband absorption. We propose perfect absorbers that can be assembled as building blocks to achieve broadband absorption in the visible and near-infrared ranges.
Minimizing radiative losses via interaction of Dark states in terahertz metamaterials
Authors: Kaur Sukhvinder , Karmakar Subhajit , Jana Arun , Varshney Ravendra Kumar , Chowdhury Dibakar Roy
Published: July 2023

We have demonstrated the coupling of dark resonant states in metamaterial array consisting of two mirrored asymmetric dual gap split-ring resonators (ASRRs). Coupling of these dark states results in hybridized states with high-quality factors.
Flexible Wavelength Shifting of Ultrafast Lasers at High Power Levels
Authors: Tunnermann Henrik , Balla Prannay , Salman Sarper H. , Fan Mingqi , Mecejus Mindaugas , Hartl Ingmar , Heyl Christoph M.
Published: July 2023

We present a wavelength shifting method suitable for high power lasers. We demonstrate our concept via simulations and experimentally shift an 80 W, 200 fs laser at 1030 nm by ±30 nm.
High Power Mode Instability in Fiber Amplifiers Employing Double-side Spiral Coiling Configuration
Authors: Tao Rumao , Xie Lianghua , Zhang Chun , Li Haokun , Ma Tian , Shen Benjian , Li Min , Feng Xi , Wen Jin , Li Fuquan , Lin Honghuan , Wang Jianjun
Published: July 2023

Mode instability of fiber amplifiers employing double-side spiral coiling configurations has been analyzed numerically for the first time, which reveals that, compared with those employing traditional spiral coiling configurations, fiber amplifiers with doubleside spiral coiling configurations have much higher mode instability threshold.
Single-polarization single-frequency Brillouin fiber laser emits near 5-W power at 1 µm
Authors: Tao Yue , Jiang Man , Liu Liu , Li Can , Zhou Pu , Jiang Zongfu
Published: July 2023

A 4.9 W single-polarization single-frequency 1064 nm Brillouin fiber laser that constructed with 20/400 polarization-maintaining germanium-doped fiber is demonstrated, which is, to the best of our knowledge, the highest power that outputs from a single-frequency fiber laser.
Pulsed Cascaded Raman Fiber Laser with Wide Wavelength Tunability
Authors: Goswami Abhigyan , Dash Sarthak , Deheri Rashmita , Arun S , Supradeepa VR
Published: July 2023

Tunable self Q-switched Ytterbium pump and spectral filtering of Raman stokes is used to generate pulsed output at wavelengths spanning 1100nm-1600nm having pulse width ~150ns with ~40kHz repetition rate and peak powers greater than ~20W.
Cascaded Raman fiber lasers pumped with narrow linewidth, low intensity noise sources
Authors: Deheri Rashmita , Dash Sarthak , Supradeepa V. R. , Balaswamy V.
Published: July 2023

We demonstrate a cascaded Raman fiber laser with low intensity noise (<-104dBc/Hz, from 9kHz to 10GHz) and ~99% spectral purity tunable over 6 Stokes orders, by using very low intensity noise, narrow linewidth pump source.
Development of Terahertz Time-Domain Rotating-Analyzer Ellipsometry
Authors: Agulto Verdad C. , Iwamoto Toshiyuki , Mag-usara Valynn Katrine , Nakajima Makoto
Published: July 2023

High-precision terahertz (THz) time-domain ellipsometry is developed. The rotating-analyzer technique is newly applied through phase component correction based on the analysis of the THz field amplitude as a function of analyzer angle.
Profile control of silicon moth-eye structures for terahertz antireflection fabricated by femtosecond laser processing
Authors: Yu Xi , Yasunaga Yuki , Goto Kazusa , Liu Dejun , Kuwahara Makoto , Ono Shingo
Published: July 2023

Micro tapers with different profiles were fabricated by using femtosecond laser processing, and these tapers were employed to constitute moth-eye structures for terahertz frequencies. The relationship between profiles and antireflective performance is quantitatively analyzed.
Hybrid moth-eye structure fabricated by laser processing and heat press coating for terahertz antireflection
Authors: Yu Xi , Goto Kazusa , Yasunaga Yuki , Soeda Junshi , Kuwahara Makoto , Ono Shingo
Published: July 2023

A hybrid antireflective structure was fabricated by attaching a polymer-based two-layer coating onto a silicon moth-eye structure, whose power reflectance can remain below 6% in a broad range from 0.6 to 2.5 THz.
High depth of field and high speed variable focus for advanced laser processing applications
Authors: Du Xiaohan , Florian Camilo , Arnold Craig B.
Published: July 2023

We use an ultrafast varifocal lens to achieve quasi-simultaneous multi-focal laser marking and scribing of transparent materials. Multiple lines located at different depths in the substrate are produced with a single laser pass.
Creation of a Coiled Microfiber with Optical Vortex
Authors: Horiuchi Yuto , Shinada Masataka , Kawaguchi Haruki , Miyamoto Katsuhiko , Arita Yoshihiko , Omatsu Takashige
Published: July 2023

We demonstrate, for the first time, the creation of a coiled microfiber with optical vortex via two-photon absorption. The fiber is fabricated by the deposition of a picosecond green laser with only an average power of a few mW, and it exhibits a diameter, a coil periodicity and a length of ~5 µm, ~90 µm, and ~400 µm, respectively.
Multi-Material Two-Photon Lithography Using Liquid Bridges Driven by a Permanent Magnet
Authors: Ishikawa Daiki , Furukawa Taichi , Mukai Masaru , Maruo Shoji
Published: July 2023

We propose a multi-material two-photon lithography technique using multiple liquid bridges driven by an external magnetic field. Using this method, multi-material 2D and 3D microstructures such as a multicolor overlapping cylinder model were fabricated.
Dark-Bright Soliton Pairs in a Microresonator
Authors: Zhang Shuangyou , Bi Toby , Ghalanos George N. , Moroney Niall P. , Del Bino Leonardo , Del'Haye Pascal
Published: July 2023

Mutually trapped dark-bright soliton pairs are demonstrated in a microresonator by seeding modes in different dispersion regimes with similar group velocity. Dark-bright-soliton pairs enable frequency combs with nearly constant power in time domain.
Topologically Protected Entanglement Emitters
Authors: Dai Tianxiang , Ao Yutian , Bao Jueming , Mao Jun , Chi Yulin , Fu Zhaorong , You Yiling , Chen Xiaojiong , Zhai Chonghao , Tang Bo , Yang Yan , Li Zhihua , Yuan Luqi , Gao Fei , Lin Xiao , Thompson Mark G. , O’Brien Jeremy L. , Li Yan , Hu Xiaoyong , Gong Qihuang , Wang Jianwei
Published: July 2023

We report topologically-protected entanglement emitters, that emit topological Einstein-Podolsky-Rosen state and multiphoton entangled state from a plug-and-play silicon- photonic chip emulating a photonic anomalous Floquet insulator in ambient conditions.
Multiplexed quantum memory with many functions: entanglement generation and interferometric processing
Authors: Parniak Michał , Mazelanik Mateusz , Leszczyński Adam , Lipka Michał , Wasilewski Wojciech
Published: July 2023

We present an optical quantum memory based on cold rubidium atoms that can generate and process quantum states of light. The multimode capacity of the memory enables enhanced implementation of protocols.
Erbium-doped Rare-Earth Oxide Thin Film Waveguides for Integrated Quantum Photonic Devices
Authors: Xu Xuejun , Hiraishi Masaya , Inaba Tomohiro , Tsuchizawa Tai , Ishizawa Atsushi , Sanada Haruki , Tawara Takehiko , Longdell Jevon , Oguri Katsuya , Gotoh Hideki
Published: July 2023

We have developed a low-loss waveguide platform for erbium-doped rare-earth oxide thin films grown on silicon substrate and investigated optical properties of erbium ions in waveguides at cryogenic temperature, aiming for integrated quantum photonic devices.
Compression of the Inhomogeneous Broadening of Ensemble Rare-earth Ions Using a Mechanical Resonance
Authors: Ohta Ryuichi , Hatomura Takuya , Hiraishi Masaya , Bastidas Victor M. , Xu Xuejun , Oguri Katsuya , Munro William J. , Okamoto Hajime
Published: July 2023

We propose a scheme to create the collective mode of ensemble rare-earth ions with a mechanical resonance, which significantly reduces the inhomogeneity of the ions and improves their photon emission and absorption efficiencies.
Polarization-independent Light Emission from Air-bridge Bull’s-eye cavities Containing a GaAs Quantum Well
Authors: Ji Sangmin , Tajiri Takeyoshi , Liu Xiao-Fei , Kiyama Haruki , Oiwa Akira , Ritzmann Julian , Ludwig Arne , Wieck Andreas D. , Iwamoto Satoshi
Published: July 2023

We demonstrate bull’s-eye cavities containing a single quantum well showing almost polarization-independent emission originating from well-degenerated orthogonally polarized cavity modes. The polarization-independent properties will allow the application of the cavity structure to a photon–spin interface.
Compact Nyquist Transmitter based on Silicon Carrier Injection Ring Modulator
Authors: Hosni Mohamed I. , Singh Karanveer , Mandalawi Younus , Misra Arijit , Preussler Stefan , Mokhtar Ayman M. , Schneider Thomas
Published: July 2023

We demonstrate simulation results for a very compact Nyquist signal transmission system based on integrated silicon ring modulators.
Generalized Carrier Assisted Differential Detection Receiver with Simplest Structure
Authors: Zhu Yixiao , Hu Weisheng
Published: July 2023

We propose a generalized carrier assisted differential detection receiver featuring simplest structure of 2×2 optical coupler and 2 single-ended photodiodes. The performance of the designed receiver is comprehensively evaluated through numerical simulation.
Quantum-noise-limited performance of BPSK transmission with EDFAs, PSAs, or Raman amplifiers
Authors: Inoue Kyo
Published: July 2023

The performance of optical transmissions is intrinsically and ultimately determined by quantum noise. This study theoretically investigates the quantum-noise-limited performance of BPSK transmission using EDFAs, PSAs, or Raman amplifiers as optical repeaters. Amplifier noise, quantum noise in a coherent state, and vacuum noise accompanied with attenuation are considered. Calculations based on the theoretical analysis qualitatively show that bidirectionally pumped Raman amplification systems achieve considerably long transmission distances.
A Low-Latency DWBA Scheme for TWDM-PON Based Fronthaul Network with Non-Zero Laser Tuning Time
Authors: Cheng Yuansen , Chan Chun-Kit
Published: July 2023

The influence of laser tuning delay is investigated for the TWDM-PON based fronthaul transmission and proposed a WT-DWBA scheme to improve the bandwidth efficiency. We realize a superior performance in wavelength reduction up to 47%.
Virus inactivation using ultraviolet LEDs
Authors: Nagamatsu Kentaro
Published: July 2023

Virus inactivation technology is attracting much attention to realize mitigation of the spread of COVID-19. There are many approaches for virus inactivation. One of the effective methods well known is directly damaging their RNAs by ultraviolet (UV) light emitting diodes (LED). However, the quantum efficiency in the UV-LED is much lower than that of the visible LEDs. So, a large cooling system is required owing to maintain irradiation because LED generates heat. In this report, the present situation of UV-LED characteristic such as the wavelength, quantum efficiency, and lifetime in LED are shown. Moreover, the virus inactivation effect by the UV-LED with including COVID-19 is explained. Finally, we introduce the recent study in UV-LEDs becoming the common in virus inactivation.
Distributed spectral measurement of supercontinuum generation along an optical nanofiber
Authors: Haddad Yosri , Beugnot Jean-Charles , Margueron Samuel , Fanjoux Gil
Published: July 2023

this work presents preliminary experimental results concerning distributed measurements along an optical nanofiber of the generation of a supercontinuum in the visible range, for a spatial and spectral dynamics analysis.
A High-Gain Cladded Erbium-Doped LNOI Waveguide Amplifier Fabricated by PLACE
Authors: Liang Youting , Zhou Junxia , Liu Zhaoxiang , Zhang Haisu , Fang Zhiwei , Zhou Yuan , Yin Difeng , Lin Jintian , Yu Jianping , Wu Rongbo , Wang Min , Cheng Ya
Published: July 2023

Erbium doped integrated waveguide amplifier based on thin film lithium niobate on insulator (LNOI) is fabricated using photolithography assisted chemo-mechanical etching technique (PLACE). A thin cladding layer of tantalum pentoxide (Ta2O5) is deposited on the fabricated LNOI waveguide which boosts the small-signal internal net gain exceeding 20 dB. Experimental characterizations reveal the advantage of Ta2O5 cladding in higher optical gain compared with the amplifier without cladding. The demonstrated high-gain LNOI amplifier holds great promise in lightwave communication, optical sensing and metrology.
Angle-tuned bremsstrahlung light sources in an electron microscope
Authors: Peng Luo-Hao , Ho Long , Kopeykin Alexey , Huang Yen-Chieh
Published: July 2023

By using a 100-keV electron beam, we report bremsstrahlung induced blue fluorescence from silica and demonstrate angle-tuned light emission between 450-500 nm from a thin-film coated glass substrate.
Optical Waveguides in Crystals Fabricated by Femtosecond Laser Writing: Recent Advances and Perspectives
Authors: Chen Feng
Published: July 2023

Crystalline waveguides well combine the excellent optical confinement of waveguide structures and the rich optical properties of crystalline materials, rendering them promising candidates for waveguide devices and integrated photonic components. Femtosecond-laser-direct writing (FsLDW), as a true three-dimensional (3D) micromachining and microfabrication technology, allows rapid prototyping of on-demand waveguide geometries buried in transparent materials via localized material modification. This presentation summarizes the recent advances of FsLDW fabrication of waveguide devices in dielectric crystals and provides perspectives for potential future directions on this topic.
110 Gbaud PAM-4 Silicon Microring Modulator operating in the C-band
Authors: Chan David W.U , Wu Xiong , Zhang Zunyue , Lu Chao , Lau Alan Pak To , Tsang Hon Ki
Published: July 2023

We present a compact silicon microring modulator (MRM) which has over 67GHz bandwidth and support over 100 Gbaud PAM-4 transmission. We measured 110 Gbaud PAM- 4 transmission (220 Gb/s) with bit error rates below 3.8 E-3.
High Performance Si and InP/EO Polymer Hybrid Optical Modulators for Data Communication and Computing
Authors: Sakuma Tomoki , Yokoyama Shiyoshi , Fujikata Junichi
Published: July 2023

High performance Si and InP/EO polymer hybrid optical modulators (HMOD) are studied. We demonstrated 112Gbps-PAM4 high-speed modulation and high-efficiency. We also propose efficient optical neural network with slow light effect by InP/EO polymer HMOD.
Heterostructure Vertical p-i-n GeSn Light-Emitting Diodes on Silicon-on-Insulator for 2µm Wavelength Band
Authors: Bansal Radhika , Chang Guo-En
Published: July 2023

We report on GeSn vertical p-i-n heterostructure light-emitting diode grown on silicon-on-insulator platform. Room-temperature electroluminescence spectra were demonstrated. These results pave the pathway for efficient on-chip light sources for integrated photonics in 2 µm wavelength band.
Improvement of Visualization of Sound Wave Propagation by Optical Microphone based on Digital Holography
Authors: Itaya Kohei , Quan Xiangyu , Awatsuji Yasuhiro , Matoba Osamu
Published: July 2023

In the optical microphone based on digital holography, the noise reduction method of phase images of sound fields is applied and then it is verified that the propagation of sound waves is more clearly observed than conventional method.
Out-of-plane symmetry-protected bound states in the continuum in a plasmonic nanofin metasurface
Authors: Aigner Andreas , Wang Juan , Tittl Andreas , Maier Stefan A. , Ren Haoran
Published: July 2023

We present a plasmonic nanofin metasurface harnessing the out-of-plane symmetry breaking in parameter space by tuning the triangle angle of 3D laser nanoprinted polymer triangles (named as nanofins) coated with gold. The plasmonic nature of the out-of-plane symmetry-protected BICs enables high field enhancement together with high q-factors from the near- to mid-infrared regions, which were utilised for refractive index and pixelated molecular sensing.
50 km-range and 3.5 cm-spatial resolution Brillouin Optical Correlation Domain Analysis with Raman Amplification
Authors: Jeong Wookjin , Song Kwang Yong , Kim Gyu-Tae , Lee Sang Bae , Lee Kwanil
Published: July 2023

We experimentally realize a long-range and high spatial resolution Brillouin sensor through optimizing key parameters in the Raman assisted time domain processing Brillouin optical correlation domain analysis.
High Sensitivity Curvature Sensors Using Stretched Four- core Fibers Through a Corner-core Excitation
Authors: Suo Lina , Peng Ya-Pei , Zhou Haimiao , Ren Shijie , Chen Nan-Kuang
Published: July 2023

The curvature sensing is realized by a tapered four-core fiber (TFCF). When the diameter of TFCF is 7 µm and a tapered length is 2.21 mm, the sensitivity of the curvature sensor is 16.12 nm/m-1.
Speckle-Based Pressure Sensing Using Pure Silica Microstructured Optical Fiber
Authors: Reja Mohammad Istiaque , Nguyen Linh V. , Ebendorff-Heidepriem Heike , Warren-Smith Stephen C.
Published: July 2023

We report a specklegram pressure sensor using a pure silica six-hole novel microstructured optical fiber. This simple and low-cost sensor has the potential for pressure measurement at high temperature harsh environment applications.
High-sensitivity multicore-fiber strain sensors based on asymmetric supermodes interference
Authors: Peng Ya-Pei , Suo Lina , Zhou Haimiao , Ren Shijie , Lu Xinhe , Chen Nan-Kuang
Published: July 2023

The high sensitivity strain sensors using tapered four-core fibers (FCFs) with the sensitivity of 21.85 pm/µε under a tapered diameter of 7.5 µm were demonstrated.
Direct Measurement of Hard X-Ray Laser Pulse Duration via Intensity Autocorrelation Techniques
Authors: Osaka Taito , Inoue Ichiro , Yamada Jumpei , Inubushi Yuichi , Tono Kensuke , Matsumura Shotaro , Nakano Shota , Ogasahara Iori , Sano Yasuhisa , Yamauchi Kazuto , Tamasaku Kenji , Yabashi Makina
Published: July 2023

We demonstrate intensity autocorrelation techniques to directly characterize the pulse duration of hard x-ray free-electron laser (XFEL) pulses. A bottleneck for the realization of the technique is insufficient intensity of XFELs propagating through currently available autocorrelators, which employ silicon perfect crystals that work as a monochromator with a bandwidth of much narrower than typical XFEL bandwidths. Thanks to the self-seeding amplification mechanism, the spectral brightness of XFELs is increased and the XFEL intensity after the crystal-based autocorrelator reaches ~1017 W/cm2 at a micrometer-scale focal spot size, making the intensity autocorrelation techniques possible for hard x-ray lasers.
Theoretical studies of X-ray induced damage in optical elements of beamlines at free-electron-laser facilities
Authors: Ziaja Beata
Published: July 2023

Here we report on our theoretical studies of X-ray induced damage in a few materials relevant for optical elements of beamlines at X-ray free-electron-laser facilities. We present our computational tools and discuss their concrete applications.
Enhancing optical nonlinear effects with spectrally periodic solitons
Authors: Lourdesamy Joshua P. , Runge Antoine F. J. , Alexander Tristram J. , Hudson Darren D. , Blanco-Redondo Andrea , de Sterke C. Martijn
Published: July 2023

We report the generation of high-intensity pulses consisting of equally spaced spectral components through linear dispersion engineering. Their interference leads to an enhanced effective nonlinearity that monotonically increases with the number of frequency components.
Few-Cycle Optical Pulses
Authors: Kung Andrew H.
Published: July 2023

This is an overview and a brief step-by-step guide to the process of converting a femtosecond laser pulse to a pulse of a few optical cycles.
19 kW Output Power of Tandem Pumped APS Fiber Amplifier with Higher Ytterbium Concentration
Authors: Shen Changle , Li Fengyun , Dai Jiangyun , Liu Nian , He Honglei , Li Fang , Zhang Lihua , Lv Jiakun , Jiang Lei , Lin Honghuan , Wang Jianjun , Jing Feng , Gao Cong
Published: July 2023

We report our recent work on power scaling of tandem pumped fiber laser up to 19 kW by increasing the doping concentration of ytterbium up to 0.3(mol)% and using larger core/clad ratio of 60/400.
Large wavelength offset for lateral bandgap engineering by using Quantum Well Intermixing
Authors: Du Lu Kuan , Chen Yang-Jeng , Chiu Jing-Ya , Chen Bo Hong , Chen Rih-You , Chiu Yi-Jen
Published: July 2023

Patterned SiO2 and Si3N4 thin film on top of InGaAsP-based epi-layer. Quantum well intermixing had use for lateral bandgap engineering. 85nm wavelength difference has been attained in 1550nm quantum well, showing potential for photonic integration.
Label free isomeric metabolism measurement with multiplex coherent anti-Stokes Raman scattering microspectroscopy
Authors: Homma Soichiro , Hashimoto Mamoru
Published: July 2023

We observed beta-oxidation of trans-fatty acid for human hepatocarcinoma cell line HepG2 with multiplex coherent anti-Stokes Raman scattering microspectroscopy under time-series and found the isomerization of unsaturated fatty acid without staining.
Development of rigid-endoscope optical coherence tomography system with KTN optical scanner
Authors: Ohmi Masato , Wada Kentaro , Yagi Shogo
Published: July 2023

We developed novel rigid-endoscope OCT system with KTN optical probe for a diagnosis in the orthopedic surgery fields. The present system demonstrates that biological image was measured by using KTN optical scanner for having degree of freedom in sample arm as OCT. The system was shown to have a resolution 14.2µm for biological tissue in few mm depth. The 3D-OCT image of human fingerprint was obtained using this OCT system.
Second-harmonic generation arthroscope with integrated femtosecond Yb fiber laser
Authors: Kashimura Y. , Matsuda R. , Yamato N. , Hashimoto M.
Published: July 2023

We have developed a second-harmonic generation arthroscope with integrated a femtosecond Yb fiber laser. The head of the arthroscope is covered with a stainless-steel cylinder of 4 mm in diameter and 180 mm in length. We demonstrate the second harmonic generation imaging of collagen of rat tendon.
Dynamic refractive index analysis by focused surface plasmon for continuous evaluation of evaporation of saliva
Authors: Chakraborty Ipsita , Abe Akinari , Matsubayashi Daiki , Kano Hiroshi
Published: July 2023

Analyzing evaporation of liquid containing multiple substances from liquid state, semi-dried state to completely dried state with focused surface plasmon. Quantitative dynamic refractive index analysis of saliva at various temperatures was performed.
Plasmon resonance wavelength controlled by SiO2 layer thickness on a silver surface and nanoantenna effect at a center of Bull's eye pattern
Authors: Shinohara Takeha , Tawa Keiko
Published: July 2023

The fluorescence enhancement is induced by Grating-coupled surface plasmon resonance (GC-SPR) of a plasmonic chip in which a wavelength-sized periodic structure is coated with a thin metal film. In the fluorescence microscopic images of nanoparticles adsorbed on the plasmonic chip observed with transmitted light, the bright spot based on the nanoantenna effect was observed at the center of a Bull's eye pattern composed of concentric circles in a plasmonic chip. In this study, resonance wavelength was controlled by SiO2 film thickness deposited on a thin Ag film and the excitation and emission enhancement was individually evaluated by an upright-inverted microscope to clarify the cause of the nanoantenna effect. As the observation result, nanoantenna effect was larger in SiO2 80 nm than SiO2 20 nm.