bluuebunny/crossref_metadata_2025 huggingface dataset:
Stimulated Scattering lasers: Pathways to power and coherence
Authors: Mildren R.P.
Published: July 2023

Instead of stimulated emission from a population inversion, Brillouin and Raman lasers use stimulated scattering from optically-excited phonons as the light amplification mechanism - optical phonons in the case of Raman scattering, and acoustic phonons for Brillouin. The interaction of optical pump, the phonons and the wavelength-shifted output beam relies on the strength of the third-order Raman or Brillouin nonlinearity of the material. These fundamental differences yield a source of laser power that has distinctive characteristics in the way the beams spatiotemporally develop as well as their spectral content. For example, stimulated scattering lasers are generally efficient generators of beams in their lowest-order spatial mode and therefore with very high beam quality. Meanwhile, recent research is also showing both Raman and Brillouin lasers are excellent at producing ultra-narrow linewidths. The lasers also have the major benefit of being capable of providing output wavelengths anywhere across the spectrum, aided by the fact the Stokes shift can be cascaded, but constrained by the wavelength of the pump source.
High harmonic generation for probing photochemical reactions
Authors: Sekikawa Taro
Published: July 2023

The dynamics of electrocyclic reaction is investigated from various aspects using high harmonic generation: High-harmonic and photoelectron spectroscopy for probing valence electrons and soft X-ray transient absorption to observe core electrons.
Quasi-Phase-Matched Water Window/keV High-Harmonic Generation from He1+ Ions
Authors: Chu Hsu-hsin , Liu Yao-Li , Wang Jyhpyng
Published: July 2023

A new scheme of quasi-phase-matched high-harmonic generation from He1+ ions is proposed. The relative conversion efficiencies for water window/keV operations are calculated to be about 15% of the perfect phase-matching condition.
Optical phased array based on optical frequency comb for broadband wavefront control of ultrashort pulse
Authors: Kato Takashi , Minoshima Kaoru
Published: July 2023

We demonstrated wavefront control by pulse-to-pulse interference using optical phased array based on optical frequency comb by controlling the wavefront of ultrashort pulses by only changing the ratio of two frequency parameters of the comb.
Kerr comb generation with dispersive waves in silica microsphere coupled to Erbium-fiber gain
Authors: Wang Xiaoying , Liu Tuo , Chen Xinpeng , Guo Hairun
Published: July 2023

We report the experimental observation of nonlinear phenomena in silica microspheres. Kerr frequency comb is generated with the measured ~25KHz linewidth. And dispersive wave was observed in microspheres at 1454nm.
Direct Observation of Hypersonic Guided Modes
Authors: Florez O. , Arregui G. , Albrechtsen M. , Ng R. C. , Gomis-Bresco J. , Stobbe S. , Sotomayor Torres C. M. , Garcia P. D.
Published: July 2023

We measure two GHz guided modes in a line defect waveguide fabricated in silicon on insulator (SOI), using Brillouin light scattering spectroscopy.
Flexible Data Center Interconnect Based on Optical Aggregation and Electrical Disaggregation
Authors: Sueyoshi Asahi , Mishina Ken , Hisano Daisuke , Maruta Akihiro
Published: July 2023

We investigate the performance of a hybrid transmission system using a 2⨯PAM4 to 16QAM optical aggregation and 16QAM to 2×QPSK electrical disaggregation as flexible data center interconnects.
Application for Decision Making by Controlling Chaotic Mode Competition Dynamics in Multi-Mode Semiconductor Laser
Authors: Iwami Ryugo , Mihana Takatomo , Kanno Kazutaka , Naruse Makoto , Uchida Atsushi
Published: July 2023

We numerically demonstrate decision making for solving the multi-armed bandit problem by controlling chaotic mode competition dynamics in a multi-mode semiconductor laser. The proposed method is effective when the number of slot machines is large.
Experiment on Extraction of Complex Electric-Field Amplitude in Chaotic Semiconductor Laser for Random Number Generation
Authors: Kudo Shota , Numata Shin , Kanno Kazutaka , Uchida Atsushi
Published: July 2023

We experimentally extract the complex electric-field amplitude of chaos in a semiconductor laser with optical feedback by using optical coherent detection. We perform random number generation using the extracted dynamics of the complex electric-field amplitude.
Multimodal Image Analysis of Blood Flow and Blood Components of Rodent Skin Flap for Understanding Necrosis
Authors: Haneishi Hideaki
Published: July 2023

Hypoxia of blood and low red blood cell ratio in blood cause necrosis and dysfunction of the tissue. The purpose of this study is to investigate the effect of blood components and flow on the tissue using a rat flap which is a partly pulled-out thick skin with blood circulation. In this study, under controlling the oxygen saturation and the flow of the blood in vivo, the reflection and transmission images of entire flap are captured with a hyper-spectral camera, a high-definition color camera and an infrared camera. Using those images, multidimensional image analysis is performed to understand the vascular structure, blood flow and those changes over time. In the presentation, a part of this image analysis is demonstrated.
A Simple and Short Temperature Sensor Integrated Optical Fiber Probe for Laser Ablation
Authors: Fukano Hideki , Matsuoka Shiori
Published: July 2023

A novel optical fiber probe with a very short integrated temperature sensor for laser ablation is proposed and successfully fabricated throughout this study. Laser irradiation and temperature monitoring were performed simultaneously using a wavelength-division-multiplexing technique.
A cascaded Brillouin laser using diamond Raman conversion
Authors: Chen Hui , Bai Zhenxu , Cai Yunpeng , Jin Duo , Mildren Richard P. , Wang Yulei , Lu Zhiwei
Published: July 2023

We demonstrate a diamond-based Brillouin laser with controllable, cascaded output spanning 15 cascaded SBS-Stokes-orders. Control of the cascading is achieved through both tailoring of the SBS cavity length and the SBS cavity output coupling.
High-Order Nonlinear Dipole Response Characterized by Extreme-Ultraviolet Ellipsometry
Authors: Chang Kuang-Yu , Huang Long-Cheng , Asaga Koji , Tsai Ming-Shian , Huang Pei-Chi , Rego Laura , Mashiko Hiroki , Oguri Katsuya , Hernandez-Garcia Carlos , Chen Ming-Chang
Published: July 2023

We demonstrate that polarization control and characterization of high-harmonic generation in non-collinear geometry performs as an excellent ellipsometry that can fully retrieve the amplitude and phase of ultrafast dipole response, advancing high harmonic spectroscopy.
Background noise canceling technique in optical measurement using phase-controlled optical frequency comb
Authors: Kato Takashi , Morito Tamaki , Nekoshima Yasuhisa , Minoshima Kaoru
Published: July 2023

Noise canceling technique using phase-controlled optical frequency comb was proposed in an optical pulse interferometric measurement. By precisely controlling the ratio of the two frequency parameters of the comb, broadband background noise is canceled.
Spectral modulation of biphotons via Fourier optical synthesis
Authors: Naito Takeru , Yabuno Masahiro , China Fumihiro , Miki Shigehito , Terai Hirotaka , Shimizu Ryosuke
Published: July 2023

We propose and demonstrate the modulation of the joint spectral intensity of a biphoton wave packet. Manipulating the two discrete joint temporal intensity distributions results in spectral modulation in 2D time-frequency space.
A Programmable Qudit-based Quantum Processor
Authors: Chi Yulin , Huang Jieshan , Zhang Zhanchuan , Mao Jun , Zhou Zinan , Chen Xiaojiong , Zhai Chonghao , Bao Jueming , Dai Tianxiang , Yuan Huihong , Zhang Ming , Dai Daoxin , Tang Bo , Yang Yan , Li Zhihua , Ding Yunhong , Oxenløwe Leif K. , Thompson Mark G. , O'Brien Jeremy L. , Li Yan , Gong Qihuang , Wang Jianwei
Published: July 2023

We designed, fabricated, and characterized a programmable qudit-based quantum processor on silicon and several quantum algorithms were implemented using qudits which shows the logarithmic speed-up, counting rate acceleration and accuracy improvement of the qudit processor.
Extreme light localization from MXene plasmons in short-wave infrared range
Authors: Park Changhoon , Park Nu-Ri , Kwon Jisung , Kim Hyerim , Koo Chong Min , Kim Myung-Ki
Published: July 2023

Light localization with plasmons in 2D material is restricted to mid- or long-wave infrared. Here, we demonstrate plasmons in 2D MXene, covering whole mid-infrared range. MXene plasmon exhibits wavelength 20 times shorter than vacuum wavelength.
Programmable MZI Based on Si Photonic MEMS Tunable Delay Line
Authors: Hong Myung S. , Kim Dong U. , Lim Min G. , Choi Dong J. , Her Man J. , Park Young J. , Jeong Youngjae , Park Jongwoo , Han Seungjun , Yu Kyoungsik , Han Sangyoon
Published: July 2023

We report on a programmable MZI based on Si photonic MEMS. The device can tune FSR (0.062–0.524 nm) as well as extinction ratio (1–16 dB). Static power consumption is less than 16 nW.
Efficient Lithium Niobate on Insulator Phase Modulator Using Light Recirculation
Authors: Huang Haijin , Han Xu , Balčytis Armandas , Dubey Aditya , Boes Andreas , Nguyen Thach , Ren Guanghui , Tan Mengxi , Tian Yonghui , Mitchell Arnan
Published: July 2023

We describe an advanced integrated optical phase modulator design that harnesses a light recycling approach with up to 3 passes to increase the efficiency of its electro-optical response. The device was fabricated on a SiN loaded lithium niobate on insulator platform and exhibited an up to 8 times enhanced modulation response for an equivalent optical and electrical input power.
Silicon Photonics Integrated Circuit for Co-Packaged Optical-IO
Authors: Akulova Yuliya , Fathololoumi Saeed , Nguyen Kimchau , Mahalingam Hari , Seddighian Pegah , Defrees Reece , Malouin Christian , Al-hemyari Kadhair , Zhu Daniel , Liao Ling , Liljeberg Thomas
Published: July 2023

Explosive growth of intra-datacenter traffic and scaling of compute fabric drive rapid evolution of the optical I/O architectures. We review advancements in silicon photonics manufacturing platform towards multi-Tb/s optical interconnects.
Highly efficient power splitter with arbitrary ratios based on inverse shape optimization
Authors: Liao Junpeng , Tian Ye , Yang Zirong , Kang Zhe , Jin Qinghui , Zhang Xiaowei
Published: July 2023

Adjoint shape optimization method is implemented to design SOI-based power splitters with arbitrary ratios. Splitters with ratios of 1:2, 1:4 and 1:8 are demonstrated with loss below 0.28 dB over a bandwidth of 100 nm.
Gate tunable moiré excitonic states in twisted WSe2/MoSe2 heterobilayers
Authors: Dong Duanfei , Zhang Wenjin , Watanabe Kenji , Taniguchi Takashi , Shinokita Keisuke , Matsuda Kazunari
Published: July 2023

We revealed the impact of charging effects on heterobilayers. The additional peaks in photoluminescence spectra under the gate voltage originate from the moiré-trapped trions. The temperature-dependent result clarified the thermal activation of the moiré trions.
Heat-mediated optical manipulation of Janus particle energized by photonic nanojet
Authors: Ren Yu-Xuan , Mao Huade , Kong Cihang , Li Bo , Wong Kenneth K.Y.
Published: July 2023

We report on the generation of wavelength-dependent photonic nanojet (PNJ) with plasmonic Janus particle. Such PNJ would produce heat and mediate the backaction force on the Janus particle for biophotonic applications.
Cancer detection with depth resolution using scattering of circularly polarized light
Authors: Nishizawa Nozomi , Al-Qadi Bassam , Kuchimaru Takahiro
Published: July 2023

Depolarization of circularly polarized light scattered from biological tissues provides valuable information for detecting cancer tissues concealed in healthy tissues. Experimentally, we demonstrated the identification of cancerous tissues in sliced biological tissues using this technique. Also, the depth profile of the tissue can be obtained by using the characteristic that the sampling depth depends on the detection angle. We computationally investigated the quantitative measurement of tumor invasion depth in early gastric cancer using the Monte Carlo method. These results indicates the feasibility of cancer detection and quantitative estimation of its progression stagein vivousing this technique.
Plasmon nanofocusing in broadband frequency
Authors: Umakoshi Takayuki , Taguchi Koki , Verma Prabhat
Published: July 2023

In this study, we have shown that plasmon nanofocusing technique enables to generate a nanolight source that spans over extremely wide frequency range from the whole visible to near-infrared regions.
Injection-Locked Optoelectronic Oscillator for Phase Noise Purification in 100-GHz Bands
Authors: Kanno Atsushi , Dat Pham Tien
Published: July 2023

Injection-locked optoelectronic oscillator operated in the 100-GHz band is configured and evaluated. High-speed modulator and photodiode realize W-band fundamental oscillation, and resultant phase noise is improved 10 dB at an offset frequency of 10 kHz.
Mode-locked Cr:ZnS laser with multiple spectral peaks at molecular vibrational resonances
Authors: Okazaki Daiki , Song Wenqing , Morichika Ikki , Ashihara Satoshi
Published: July 2023

We demonstrate mode-locked oscillation accompanied by multiple spectral peaks at absorption lines of gaseous molecules. Numerical simulations reveal that the modulated spectrum represents peak structure while it evolves in a self-consistent manner inside the cavity.
Temporal Solitons in Coherently driven Active Fiber Resonators
Authors: Leo François
Published: July 2023

In this talk I will discuss our recent results about active cavity solitons. We show how coherent and incoherent gain mechanisms can both be harnessed for stable soliton generation.
Ultra-broadband photodetector module toward 200 GHz using UTC-PD and frequency compensation technique
Authors: Umezawa Toshimasa , Matsumoto Atsushi , Akahane Kouichi , Kanno Atsushi , Yamamoto Naokatsu
Published: July 2023

We presented an ultra-broadband photodetector module toward 200-GHz using a UTC-PD chip and a frequency compensation technique. The fabricated PD module exhibited high 3-dB bandwidth over 110-GHz, and the improvement using frequency compensation was discussed.
A switchable THz filter by integrating an H-shaped metamaterial and ultra-small MEMS switches
Authors: Huang Ying , Okatani Taiyu , Kanamori Yoshiaki
Published: July 2023

We proposed ultra-fast switchable terahertz (THz) filters consisting of a metamaterial with ultra-small MEMS switches and fabricated static on- and off-state-filters offering a 55%-transmittance-difference at 0.61 THz. A 0.9 MHz-tuning-speed is expected.
Discussion on optical parameters of quartz crystal in the terahertz frequency
Authors: Takeya Kei , Ishizuki Hideki , Taira Takunori
Published: July 2023

For crystal quartz, a promising optical material for a high power terahertz waves, there is a lack of substantial reporting in the literature and other sources. For the refractive index, there is a lack of detailed reports on birefringence in THz frequency, while for the absorption coefficient, there is a variation in values in previous literature values. In this study, quartz samples with different geometries and impurity concentrations were analyzed by terahertz time-domain spectroscopy in order to discuss the optical parameters of quartz crystals in detail.
Alignment-Insensitive THz-OAM Wave Generator Based on Square Lattice Photonic Crystal
Authors: Hata Remma , Kishikawa Hiroki , Fujikata Junichi
Published: July 2023

For orbital angular momentum (OAM) wave generation, high-accuracy beam alignment is usually required. A photonic crystal (PhC)-based OAM wave generator is proposed and analyzed numerically. Very small alignment-dependence can be achieved with high efficiency.
Two-dimensional array of multiple-armed chiral surface reliefs in azo-polymers with rotating petal beams
Authors: Tomita Arata , Vallés Adam , Miyamoto Katsuhiko , Omatsu Takashige
Published: July 2023

We report on the formation of two-dimensional array of two-/four-armed chiral surface reliefs of azo-polymers by irradiation of a rotating petal-shaped beam with zero orbital angular momentum. Such chiral surface relief array will pave the way towards advanced rewritable ultrahigh-density optical data storages.
Processing the bulk of silicon using IR ultrashort laser pulses – from waveguides to welding
Authors: Nolte Stefan , Alasgarzade Namig , Alberucci Alessandro , Blothe Markus , Jisha Chandroth P. , Li Qingfeng , Matthäus Gabor , Chambonneau Maxime
Published: July 2023

We report on processing the bulk of silicon with infrared ultrashort laser pulses. The localized energy deposition and resulting material modifications enable various applications, from the inscription of waveguides to dicing and semiconductor–metal welding.
Multiphoton Photoreduction for Biomimetic Applications of Hydrogels
Authors: Nagano Yo , Tsunemitsu Kaneto , Onoe Hiroaki , Terakawa Mitsuhiro
Published: July 2023

Light-driven control of the flow velocity inside a hydrogel microchannel is demonstrated by fabricating metal microstructures by multiphoton photoreduction. A technique to evaluate the local strain and compression of the hydrogel will also be described.
Quantum Cascade Laser Frequency Comb for Comb-Calibrated Spectroscopy in the Long-Wave Infrared
Authors: Komagata K. N. , Gianella M. , Jouy P. , Kapsalidis F. , Shahmohammadi M. , Beck M. , Matthey R. , Wittwer V. J. , Hugi A. , Faist J. , Emmenegger L. , Südmeyer T. , Schilt S.
Published: July 2023

We demonstrate the suitability of mid-infrared quantum cascade laser frequency combs as highly-accurate frequency references. We exploit a fully-stabilized quantum cascade laser frequency comb to perform spectroscopy with 100-kHz frequency accuracy at 7.7 μm.
Fourier-transform spectroscopy with a mid-infrared frequency comb for line-shape study of CO-Ar
Authors: Nishiyama Akiko , Kowzan Grzegorz , Charczun Dominik , Masłowski Piotr
Published: July 2023

We developed a mid-infrared optical frequency comb-based Fourier-transform spectroscopy system and applied for line-shape study of fundamental vibrational band of CO. The technique allows to determine line-shape parameters precisely in wide range of mid-infrared region.
Tunable coupling of a single quantum emitter to a composite nanofiber cavity
Authors: Yalla Ramachandrarao , Shafi K. Muhammed , Nayak Kali P , Hakuta Kohzo
Published: July 2023

We demonstrate cavity-enhanced spontaneous emission over a broad wave-length range for a single quantum emitter using a composite nanofiber cavity. We also discuss how the longitudinal polarization of the light appears in the composite cavity.
Electron beam excited non-bridging oxygen hole centers in silica as nanophotonic probes
Authors: Sadgrove M. , Irita M. , Uemura Y. , Ito S. , Osawa Y. , Kikuchi S. , Homma Y.
Published: July 2023

Electron-beam cathode luminescence spectroscopy is a remarkable method for probing nanophotonic modes with deep sub-diffraction limited resolution. However, its use has been limited to modes which radiate to the far-field where detection occurs. Here, we electrically excited non-bridging oxygen hole centers (NBOHCs) in a silica fiber and collected their fluorescence through the fiber modes [1]. This allows the probing of the mode local density of states, despite the fiber modes being non-radiative. We discuss extensions of the technique and future applications.
Expanding ultrahigh-Q r/a range of L3 nanocavity by large-scale automated optimization
Authors: Kuramochi Eiichi , Kita Shota , Shinya Akihiko , Notomi Masaya
Published: July 2023

We reveal that highly-optimized L3 nanocavity (theoretical Q >107) are highly sensitive to design parameters. By optimizing the cavity in terms of design parameters, we demonstrated ultrahigh-Q L3 nanocavities at r/a far below/above 0.25.
Multi-level anti-counterfeiting based on covert structural features embedded in a fs-laser-treated gold/graphene layer
Authors: Jiang Shiru , Kim Su-Han , Park Chul-Soon , Lee Woo-Bin , Lee Sang-Shin
Published: July 2023

A gold/graphene hybrid layer works as triple-level anti-counterfeiting after femtosecond laser irradiation. The presence of graphene enables key structural information related to anti-counterfeiting signatures to be covert thoroughly under the surface of the hybrid layer.
Non-Hermitian nanophotonics with photonic crystal cavities
Authors: Takata Kenta , Nozaki Kengo , Kuramochi Eiichi , Matsuo Shinji , Takeda Koji , Fujii Takuro , Kita Shota , Roberts Nathan , Shinya Akihiko , Notomi Masaya
Published: July 2023

We review recent research of exceptional point degeneracies in on-chip coupled cavities, including our experimental demonstration with electrically pumped photonic crystal lasers and extended coupled-mode theory. We also discuss extra properties of such non-Hermitian systems.
High-Q fiber Fabry-Pérot resonator of sub-centimeter length for stimulated Brillouin scattering laser
Authors: Kato Shinya , Aoki Takao
Published: July 2023

We demonstrate a stimulated Brillouin scattering (SBS) laser using a high-Q optical fiber Fabry-Pérot resonator. The free spectral range coincides with the SBS shift and the resonator length is about 5 mm.
Imaging of Electromagnetic-Waves using RoF System Based on Si Photonics Microring Modulator Array
Authors: Li Liucun , Arai Hiroyuki , Baba Toshihiko
Published: July 2023

We propose an electromagnetic wave imaging RoF system consisting of RF sensor and Si microring modulator arrays. It was demonstrated in a POC experiment at 3.5 GHz, for which we confirmed the agreement with simulations.
Annealing sequence dependence of directly bonded InP/Si substrate for GaInAsP LDs on silicon platform
Authors: Zhao Liang , Sato Motonari , Shibukawa Kota , Ito Shingo , Agata Koji , Shimomura Kazuhiko
Published: July 2023

We demonstrated the bonding of thin film InP and Si using wafer direct bonding technique, described the heating process of the InP-Si directly attached substrate. The evaluation of the prepared InP-Si substrate by observing the surface state with Nomarski-mode images is better than previous annealing sequence. We have successfully obtained lasing characteristics of GaInAsP MQW LD using this substrate.
Photothermal nonlinearity in a graphene oxide covered silicon micro-ring resonator
Authors: Chen Chih-Hsien , Wu Chang-Yi , Cheng Nai-Wen , Yen Tzu-Hsiang , Huang Chia-Wei , Huang Chin-Shih , Hsieh Hao-Chun , Pan Hung-Chun , Wu Yu-Fu , Yang Tai-Chi , Hung Yung-Jr
Published: July 2023

We fabricated highly-oxidized graphene oxide (GO) thin film to provide enhanced photothermal nonlinearity in GO-covered silicon micro-ring resonators. We observed 2~3 times increases in wavelength shifts of ring resonators under a fixed pumping power.
Robust High-Order Free-Space Mode Sorting Enabled by a Software Defined Photonic Mesh
Authors: Boldin Aleksandr , Alsaigh Rakan Edrees , Milanizadeh Maziyar , Klitis Charalambos , Toso Fabio , Fontaine Nicolas , Melloni Andrea , Ferrari Giorgio , Sorel Marc , Miller David AB , Morichetti Francesco , Lavery Martin P.J.
Published: July 2023

We propose a new free-space mode-sorter that can distinguish 15 spatial-modes with high efficiency, high fill factor and low crosstalk in non-perfect optical systems through the integrations of custom mode filter coupled with software-controllable photonic-mesh.
Entropy of Mode Mixers for Optical Unitary Converter based on Multi-Plane Light Conversion
Authors: Tanomura Ryota , Taguchi Yoshitaka , Tang Rui , Tanemura Takuo , Nakano Yoshiaki
Published: July 2023

Requirement of mode mixers in optical unitary converters based on multi-plane light conversion is examined. The “entropy” of each mixer, which describes the degree of mixing, is revealed to be crucial in determining the performance.
Resonant Coupling between Image Dipoles of Gold Nanoparticles and Fano Resonance of Capped Gold Nanoslits for Enhanced Oligonucleotide Detection
Authors: Wang Sheng-Hann , Kuo Chia-Wen , Lo Shu-Cheng , Yong Wei-Han , Ho Ya-Lun , Delaunay Jean-Jacques , Tsai Wan-Shao , Wei Pei-Kuen
Published: July 2023

The progressing Bloch wave surface plasmon polaritons depressed by the image dipole of AuNPs on the capped gold nanoslit results in dramatic Fano peak drops and significantly enhance the oligonucleotide detection to 100 fM level.
Expanded optical waveguide theory with magneto-optical effect and magnetoelectrical effect
Authors: Honda Yoshihiro , Igarashi Eri , Amemiya Tomohiro
Published: July 2023

In this paper, we proposed a comprehensive optical waveguide theory including magneto-optical (MO) effect and magnetoelectrical (ME) effect. By using this theory, we analyzed an optical waveguide on which metamaterials and magnetic materials are arranged to control MO effect and ME effect independently. In addition, it was confirmed that the interaction between MO effect and ME effect appeared depending on the arrangement of metamaterials and the direction of magnetization, and it was shown that the nonreciprocity of the propagating light was greatly enhanced.
Background-Free Vibrational Spectroscopy based on Destructive Interference around 2.3 µm
Authors: Song Wenqing , Okazaki Daiki , Morichika Ikki , Ashihara Satoshi
Published: July 2023

We demonstrate background-free vibrational spectroscopy by using a mode-locked Cr:ZnS laser and a well-stabilized interferometer. The Allan deviation measurement indicates a potential sensitivity of 3.57×10-6 Hz-1/2 as normalized noise equivalent absorption.
Frequency stabilized hard x ray lasers
Authors: Yoneda Hitoki , Michine Yurina , Inubushi Yuichi , Yabashi Makina
Published: July 2023

By using Bragg condition inside x-ray laser medium, we have succeeded to achieve distribution feedback type laser in hard x ray region. We also use crystal lattice constant so that it is possible to demonstrate the first frequency stabilized hard x ray lasers.
XFEL single-nanometer focusing system at SACLA
Authors: Yamada Jumpei , Matsuyama Satoshi , Inoue Takato , Ito Atsuki , Inoue Ichiro , Osaka Taito , Inubushi Yuichi , Yumoto Hirokatsu , Koyama Takahisa , Ohashi Haruhiko , Yamauchi Kazuto , Yabashi Makina
Published: July 2023

A sub-10 nm focusing mirror system for the XFEL has been developed to generate an ultra-intense X-ray laser field. For the sub-10 nm focusing optic, an advanced Kirkpatrick- Baez mirror system based on Wolter-type III geometry has been adopted. The mirrors were fabricated based on a strategy of X-ray wavefront correction. As the results of the performance test at SACLA, we confirmed nearly diffraction-limited wavefront accuracy, 7 nm focusing spot size, more than 10 hours stability, and ~1022 W/cm2 intensity.
Energy-Scaling of Multi-Pass Cell Post-Compression: The Bow Tie MPC Scheme
Authors: Schönberg Arthur , Seidel Markus , Escoto Esmerando , Carlström Stefanos , Arisholm Gunnar , Lang Tino , Hartl Ingmar , Heyl Christoph M.
Published: July 2023

We introduce the bow tie multi-pass cell as a new scheme for post-compression of high-energy laser pulses, overcoming current limits of Herriott-type multi-pass cell-based postcompression imposed mainly by mirror damage threshold limitations.
Efficient Simulation of Supercontinua from Cubic, Quadratic and Cascaded Nonlinearities
Authors: Voumard Thibault , Ludwig Markus , Wildi Thibault , Herr Tobias
Published: July 2023

Chip-integrated nonlinear waveguides with quadratic and cubic optical nonlinearities can give rise to multi-octave spanning supercontinua. An efficient implementation for numerically simulating such ultra-broadband spectra is presented.
A New Method for Measuring AlGaOx Oxidation Width of Circular Defect in 2D Photonic Crystal (CirD) Laser
Authors: Zuo Rubing , Miyazaki Shunsuke , Kinoshita Ryosei , Ye Hanqiao , Morita Masaya , Kaichi Kenta , Morifuji Masato , Kajii Hirotake , Maruta Akihiro , Kondow Masahiko
Published: July 2023

To develop the CirD laser, which will be used in intra-chip optical interconnects, we investigate a new method to measure the oxidation width of AlGaOx precisely so that we can obtain the most appropriate Q factor.
An Optical Filter Based on Sidewall Long-Period Grating in Lithium Niobate on Insulator
Authors: Li Jun Hui , Wang Meng Ke , Chen Kai Xin
Published: July 2023

We propose an optical filter based on sidewall long-period waveguide grating with metal absorption layer in lithium niobite-on-insulator. Our designed filter achieves an extinction ratio >30 dB at 1550 nm wavelength and a 3-dB bandwidth of 78 nm.
Design of dual-wavelength waveplate made of single crystal for coherent anti-Stokes Raman endoscopy
Authors: Kawasaki Y. , Hashimoto M.
Published: July 2023

We have determined the quartz crystal thickness for dual-wavelength waveplate to maximize the intensity of coherent anti-Stokes Raman scattering (CARS). The CARS intensity with incident orthogonally polarized beams was 99.0% when excited with parallel polarization.
Fabrication of Flexible Artificial Compound Eyes for Real-time Focal Length Tuning
Authors: Jung Jihyun , Ahn Heesang , Song Hyerin , Lee Seunghun , Yoon Taerim , Kim Taeyeon , Kim Soojung , Kim Kyujung
Published: July 2023

We present a microlens arrays (MLAs) based artificial compound eye for tuning a focal length. The flexible MLAs-patterned poly (dimetylsiloxane) (PDMS) film was deformed from planar to curved shape with the increase of the fluid injection, acting as a focus-tunable lens. With a designed optical system, we compared focused beam intensity depending on the radius of curvature of the fabricated lens.
Photoacoustic image reconstruction with polynomial based interpolation algorithms
Authors: Paul Avijit , Warbal Pankaj , Mukherjee Amrita , Paul Subhadip , Saha Ratan K.
Published: July 2023

We employ the polynomial-based interpolation methods for photoacoustic tomography (PAT). The nearest-neighbour, bilinear, bicubic, and biquintic interpolation algorithms were utilized to construct the model matrix. The performance of these interpolation techniques was studied.
Novel Plasmonic Metamaterials based on Ag Nano-Hemispheres and Metal/Dielectric Multilayer Structures
Authors: Niguma R. , Maeda S. , Matsuyama T. , Wada K. , Okamoto K.
Published: July 2023

We have devised a novel plasmonic metamaterial based on Ag Nano-hemispheres and Ag/SiO2 multilayer structures. This structure enables the propagation of near-field light and is expected to be observed beyond the diffraction limit.
New Sensitive Biosensor Platform by Plasmon Field Enhanced Photoreaction and Fluorescence
Authors: Horio Shohei , Mizutani Koji , Sunayama Hirobumi , Takeuchi Toshifumi , Tawa Keiko
Published: July 2023

We used the plasmon-enhanced electric field not only as an excitation enhancement field for fluorescence but also as a photochemical reaction field, aiming to create a biosensor platform with highly sensitive detection in the area spatially controlled. The plasmonic chip used has a bull's eye structure with a pitch of 480 nm coated with silver and silica layers, composed of 2000 bull's-eye patterns array. 3-((2-formyl-3-methylphenyl) thio)propanoic acid (O-MBA) was modified on the aminated surface of the plasmonic chip and after exposure to UV light, the intermediates of O-MBA reacted with biotin-maleimide (Biotin-M). Cy5- Streptavidin (Cy5-SA) was added to biotinylated surface as a detection target and detected with transmitted-type fluorescence microscope. A bright fluorescence image was obtained in the Bull's eye pattern within the UV-irradiated spot. This is due to the fluorescence enhancement effect in the Bull's eye pattern and the higher density of binding site by the enhanced photochemical reaction of O-MBA. The calibration curve of fluorescence intensity against the Cy5-SA concentration show that a highly sensitive biosensor platform was constructed by promoting photochemical reactions and enhancing fluorescence.
Surface-enhanced low-frequency Raman spectroscopy
Authors: Morisaki Ryosuke , Umakoshi Takayuki , Verma Prabhat
Published: July 2023

In this research, we for the first time demonstrated surface-enhanced low-frequency Raman spectroscopy. Low-frequency Raman scattering from a thin layered MoS2, which arises from inter-layer interaction, was highly enhanced by silver nanoparticles.
Plasmon-Enhanced Solar-Driven Hydrogen Evolution Using Plasmonic Metasurface Broadband Absorbers
Authors: Peng Tzu-Yu , Yu Meng-Ju , Chang Chih-Li , Lan Hao-Yu , Chiao Zong-Yi , Chen Yu-Chia , Lee Ho Wai Howard , Chang Yia-Chung , Chang Shu-Wei , Tanaka Takuo , Tung Vincent , Chou Ho-Hsiu , Lu Yu-Jung
Published: July 2023

Broadband perfect absorbers in the visible region have attracted considerable attention in many fields, especially in solar thermophotovoltaic and energy harvesting systems. However, developing light absorbers with high absorptivity, thermal stability, and a broad bandwidth remains a great challenge. Here, we theoretically and experimentally demonstrate that transition metal nitride metasurface absorber exhibits broadband absorption with an average absorption of more than 92% over a wavelength range of 400 to 750 nm [1]. The increase in absorption is attributed to the localized surface plasmon resonance (LSPR). We report the plasmon-enhanced visible-light-driven hydrogen production from water using a polymer photocatalyst integrated with a TiN metasurface absorber. A 300% increase in the hydrogen evolution rate was observed due to the LSPR that enhances the rates of light absorption, carrier separation, and hot-carrier transfer in polymer photocatalyst. The concept is extensible to other types of photocatalyst such as 2D materials. We will also discuss the outlook for plasmonic metasurface in applications of solar energy harvesting systems.
Plasmon-Enhanced Upconversion Luminescence in Two-Dimensional Halide Perovskite Film
Authors: Wang Yen-Yu , Peng Tzu-Yu , Chen Jia-Wern , Liu Fang-Zhou , Leung Tik-Lun , Chu Chih-Wei , Djurišić Aleksandra B. , Lu Yu-Jung
Published: July 2023

We achieve Upconversion Luminescence Enhancement on 2D perovskite by using alternative plasmonic material (HfN) Bowtie Structure.
An Experimental Study on the Effect of Modulation Distortion on DDMZM Based OSSB+C Signal Generation
Authors: Suzuki Yusuke , Okajima Ryo , Kariyawasam Amila , Maeda Joji
Published: July 2023

We experimentally demonstrated the impact of fiber dispersion on modulation distortion of dual-drive Mach-Zehnder modulator-based OSSB+C transmission. Unlike in single-drive Mach-Zehnder modulator-based transmitter, fiber dispersion does not compensate modulation distortion in dual-drive Mach-Zehnder modulator-based transmitter.
Modeling and design of a resonantly pumped Q-switched Ho:YLF laser with an intracavity pumping scheme
Authors: Sato Atsushi , Ishii Shoken
Published: July 2023

An intracavity pumping scheme for a resonantly pumped Q-switched Ho:YLF laser was investigated. The results of simulations indicated that 100-mJ-level Q-switched operations of the Ho:YLF laser can be expected under 1.5-J diode pumping.
Covalent Organic Framework for Q-Switched All-Solid-State Laser
Authors: Wang Hsuan-Sen , EL-Mahdy Ahmed F. M. , Kuo Shiao-Wei , Su Sih-Po , Hou Kuan-Hong , Lee Chao-Kuei
Published: July 2023

In this work, A new type of organic material, Covalent Organic Frameworks (COF), was successfully demonstrated its functionality for pulsing the solid-state laser. This was based on π-bonding delocalization within the SA. ProPh-PyTA-COF exhibits versatile optical nonlinear absorption. Two saturable absorption behavior with the situation intensity of 92MW/cm2 and 1kW/cm2 were observed. Besides the first pulsed Q-switched all-solid-state laser using COFs as an absorber, the evolution of laser performance as pump power was also characterized and discussed.
Prevention of Intermittent Chaos in Semiconductor Laser with Optical Feedback
Authors: Inoue Sota , Kanno Kazutaka , Uchida Atsushi
Published: July 2023

We numerically predict the occurrence of intermittent chaos in a semiconductor laser with optical feedback using the information on a chaotic attractor. We succeed in preventing the intermittent chaos by perturbing the optical feedback phase.
Femtosecond Laser Writing Circular Cladding Waveguide in Er:SrF2 Crystal
Authors: Liu Kaixin , Zhang Zihao , Zhang Zhen , Su Liangbi , Wei Zhiyi , Wang Junli
Published: July 2023

We report on the use of femtosecond laser to inscribe circular cladding waveguides in Er:SrF2 infrared crystals, and the minimum propagation loss (0.612 dB/cm) of the waveguide is determined at 976 nm wavelength.
Direct Writing of Conductive Patterns by Bubble Printing of Liquid Metal Nanoparticles
Authors: Kobayashi Tatsuya , Mukai Masaru , Ueno Kazuhide , Furukawa Taichi , Maruo Shoji
Published: July 2023

Bubble printing of Ga-In liquid metal nanoparticles was demonstrated. Fine line patterns with line width of several µm were formed. The conductivity of the resultant line patterns was improved by galvanic replacement using silver nitrate.
Laser oscillation of spectral drill cavity including gain media
Authors: Ohno Seigo , Miyamoto Katsuhiko , Hayashi Shin’ichiro , Urata Yoshiharu , Seikine Norihiko
Published: July 2023

We have developed a spectral drill, which is a Fabry Perot cavity tunable through a geometric phase shifter. A gain medium was additionally introduced within the spectral drill cavity and laser oscillation was observed.
Active-dummy compensation of temperature drift in refractive-index-sensing optical comb by use of mechanically-sharing dual-comb configuration
Authors: Miyamura Shogo , Oe Ryo , Kajisa Taira , Tokizane Yu , Minamikawa Takeo , Taue Shuji , Yasui Takeshi
Published: July 2023

We suppress the temperature drift in the refractive-index-sensing optical frequency comb (RI-sensing OFC) by using the difference of repetition frequency between an active RI-sensing OFC and a dummy one in the mechanical-sharing dual-fiber-cavity configuration.
Development of mode-extracting optical frequency comb for rapid wavelength-scanning digital holography
Authors: Sadahiro Kazuki , Tokizane Yu , Hase Eiji , Minamikawa Takeo , Yasui Takeshi
Published: July 2023

We demonstrate mode-extracting optical frequency comb as a light source for rapid, high-precision wavelength-scanning digital holography, enabling the shape measurement of an object with wide axial dynamic range from the correlation between wavelength and phase.
Toward A 1D Chain Of Cold Rydberg Atoms Next To An Optical Nanofiber
Authors: Brown Dylan , Vylegzhanin Alexey , Raj Aswathy , Chormaic Süe Nic
Published: July 2023

We experimentally generate Rydberg atoms next to an optical nanofiber via the evanescent field to investigate the impact of the fiber on the excitation, with the goal of producing a 1D chain of Rydberg atoms.
Development of yellow (575 nm) laser by single-mode double-clad structured Dy3+ -doped waterproof fluoro-aluminate glass fiber
Authors: Koganei Ayaka , takahashi Kenta , Nashimoto Natsuho , Ishii Osamu , Yamazaki Masaaki , Fujimoto Yasushi
Published: July 2023

We have been developing a high-power, high-efficiency yellow laser using single-mode double-clad structured Dy3+-doped waterproof fluoro-aluminate glass fiber. This technique will provide a solid-state yellow laser with compact and easy maintenance.
A Multimode Interference method for power combining and coupling tunable optical power in a single mode fiber
Authors: Srivastava K. , Bhatia N.
Published: July 2023

We show that the input power of multiple launch fields in a square core multimode fiber can be combined, and continuously tuned to 0-6 dB of the input power by the phase control of inputs.
Study on improving the real-time performance of Self-Coupled Distance and Velocity Sensor
Authors: Sato Daiki , Higuchi Yuto , Tsuda Norio , Yamada Jun
Published: July 2023

Self-coupled distance and velocity sensors calculate distance and velocity using self-coupled signals, which are obtained using the triangular wave modulation of laser diodes. Previous research on distance and velocity sensors based on self-coupled signals used multiple triangular wave pulses to obtain data, which is time-consuming. To solve this problem, we have devised a method to completely measure distance and velocity using a single pulse of the self-coupled signal. This paper reports the verification results of distance and velocity based on a single pulse.
-infrared Sensing with a Stacked Photodiode
Authors: Sung Hyunjoon , Kim Yunkyung
Published: July 2023

For near-infrared sensing of CMOS image sensor, a pixel structure having stacked photodiode is suggested. The optical simulation confirms the suggested structure is useful for both visible and near-infrared imaging without thickening silicon.
Single Droplet Formation in the Ionic Liquid/Water Mixture by Optical Tweezers
Authors: Tanaka Maho , Tsuboi Yasuyuki , Yuyama Ken-ichi
Published: July 2023

We demonstrate the formation of a single core-shell droplet by focusing a near-infrared laser beam into a ionic liquid/water mixture. The droplet was characterized by means of fluorescence imaging and Raman spectroscopic analysis.
Fabrication of Lead-Halide Perovskite Film with Two-Dimensional Photonic Lattice
Authors: Morishita Junki , Adachi Yuji , Enna Takuya , Takahashi Shun , Yamamoto Yohei , Yamashita Kenichi
Published: July 2023

We succeeded in fabrication of two-dimensional photonic lattice structures in a lead-halide perovskite microcavity. Generally it is difficult to uniformly prepare a perovskite film even in a planar form due to its high crystallinity. To overcome this issue, we employed a simple strategy that is a combination of nanoimprint lithography and spin-coating methods. This scheme enables us to fabricate the wide-area two-dimensional photonic lattice in the perovskite active layer that is promising as room-temperature polariton material.
Electromagnetic Shielding of Electrically-Insulating Ionic Solution
Authors: Kwon Jisung , Hong Junpyo , Iqbal Aamir , Koo Chong Min , Kim Myung-Ki
Published: July 2023

Electrically-insulative ionic solutions of KBr, NaCl, and CaCl2 salts are employed as effective electromagnetic interference (EMI) shielding materials. Debye-Drude theoretical models is applied for illuminating the EMI shielding mechanism of ionic solution.
The Revolution of Silicon Photonics
Authors: Lipson Michal
Published: July 2023

We are now experiencing a revolution in optical technologies, where one can print and control massive optical circuits, on a microelectronic chip. This revolution is enabling a whole range of applications that are in need for scalable optical technologies and its opening the door to areas that only a decade ago were unimaginable.
Modal analysis of diffraction by snake gratings using a tensor product of pseudo-periodic functions and Legendre polynomials
Authors: Rinah Rasoamilanto Malalatiana , Randriamihaja Manjakavola Honoré , Andriamanampisoa Lala Bakonirina , Granet Gérard , Raniriharinosy Karyl
Published: July 2023

The problem of diffraction by snake gratings is presented and formulated as an eigenvalue eigenvector problem. A numerical solution is obtained thanks to the method of moments where a tensor product of pseudo-periodic functions and Legendre polynomials is used as expansion and test functions. The method is validated by comparison with the usual Fourier modal method (FMM) as applied to crossed gratings. Our method is shown to be more efficient than the FMM in the case of metallic gratings.
Two-mode squeezing over deployed fiber coexisting with conventional communications
Authors: Chapman Joseph C. , Miloshevsky Alexander , Lu Hsuan-Hao , Rao Nageswara , Alshowkan Muneer , Peters Nicholas A.
Published: July 2023

Squeezed light is a crucial resource for continuous-variable (CV) quantum information science. Distributed multi-mode squeezing is critical for enabling CV quantum networks and distributed quantum sensing. To date, multi-mode squeezing measured by homodyne detection has been limited to single-room experiments without coexisting classical signals, i.e., on “dark” fiber. Here, after distribution through separate fiber spools (5 km), −0.9 ± 0.1-dB coexistent two-mode squeezing is measured. Moreover, after distribution through separate deployed campus fibers (about 250 m and 1.2 km), −0.5 ± 0.1-dB coexistent two-mode squeezing is measured. Prior to distribution, the squeezed modes are each frequency multiplexed with several classical signals—including the local oscillator and conventional network signals—demonstrating that the squeezed modes do not need dedicated dark fiber. After distribution, joint two-mode squeezing is measured and recorded for post-processing using triggered homodyne detection in separate locations. This demonstration enables future applications in quantum networks and quantum sensing that rely on distributed multi-mode squeezing.
Anomalous absorption in TM polarization light by echelle gratings
Authors: Zhang Qian , Huang Zhisen , Jia Wei , Zhang Shanwen
Published: July 2023

Echelle grating plays an essential role in spectral analysis due to its broadband blaze, high dispersion, and high resolution; however, its absorption properties have received no attention. In this paper, we investigate the effect of parameters including incident wavelength, incident angle, and blaze angle on the absorption properties of the Al echelle grating. Based on calculations by the boundary integral equation method, we observe that the Al grating with a large blaze angle has an absorption enhancement effect on TM-polarized waves, and its intensity increases as the incident angle approaches the pseudo-Brewster angle (maximum absorption over 87%). In particular, this absorption enhancement effect is present in the wideband and somewhat generalizable to other metallic materials. In addition, the potential physical mechanisms underlying the absorption enhancement of the echelle grating are analyzed in detail through the electric field distribution. The resonance between the grating anomaly and the pseudo-Brewster effect results in the appearance of surface plasmon polariton and strong absorption. These findings will bring new understanding to the study of echelle gratings in case of high energy loss when the light incidents with a high angle for high resolution and will also show potential applications in electromagnetic stealth, photothermal conversion, and photodetection.
Field test of quantum key distribution with high key creation efficiency
Authors: Kao Yung-Cheng , Huang Sheng-Hsuan , Chang Chin-Hsuan , Wu Chih-Hsiang , Chu Shih-Hsien , Jiang Jian , Zhang An-Chi , Huang Sheng-Yao , Yan Jhih-Heng , Feng Kai-Ming , Chuu Chih-Sung
Published: July 2023

Quantum key distribution (QKD) promises unconditional security for communication. However, the random choices of the measurement basis in QKD usually result in low key creation efficiency. This drawback is overcome in the differential-phase-shift QKD, provided that each photon can be prepared in a large number of time slots with a proper waveform. In this work we develop a miniature room-temperature 1550-nm single-photon source to generate narrowband single photon in 50 time slots with a nearly optimal waveform for achieving unity key creation efficiency. By utilizing these single photons in the field test, we demonstrate the differential-phase-shift QKD with a key creation efficiency of 97%. Our work shows that the practical QKD can benefit from the narrowband single photons with controllable waveforms.