bluuebunny/crossref_metadata_2025 huggingface dataset:
Coherent modulation of the high harmonic generation from liquid water using double MIR pulses excitation
Authors: Yang Tianqi , Kurihara Takayuki , Mizuno Tomoya , Kanai Teruto , Harada Yoshihisa , Itatani Jiro
Published: July 2023

High harmonics are produced in a liquid water jet by two noncollinear MIR pulses. We observed a persisting interference-like modulation in high harmonic signals, suggesting the existence of a coherent polarization.
Phase Sensitive Surface Profile Measurement Using Swept Multigigahertz Supercontinuum Comb
Authors: Choi Samuel , Yamazaki Takuro , Hibino Hiroshi , Suzuki Takamasa , Shioda Tatsutoshi
Published: July 2023

A high-speed full-field surface profile measurement technique using frequency tunable supercontinuum multigigaherz comb was proposed. The phase modulation to the reference path of the microscopic interferometer resolved the previous non-measurable problem, and simultaneous detection of two modalities with amplitude and phase was realized. 3D measurements with a scan speed of 865 (depth) × 512 (length) × 640 (width) voxels/s was achieved. The depth resolution was improved to be approximately 30 μm.
Efficient Spin-Photon Interfaces for Quantum Networks
Authors: Wrachtrup J.
Published: July 2023

Spin defects in wide band gap semiconductors are a leading contender in various areas of quantum technology. Most notably they have been established as a novel tool for nanoscale sensing and as major hardware for long distance quantum entanglement, necessary for quantum repeater structures [1,2]. I will present the use of spin defects in Silicon Carbide (SiC) for quantum photonics and specifically for spin-photon interfaces [3]. Specifically, I will address the spin properties of the material and the interplay between photon emission and spin memory times. It turns out, that the silicon vacancy in SiC is an excellent compromise between photonic and spin quantum memory properties [4]. Even when incorporated into microscale photonic waveguides the optical transitions retain high quality such that long spin coherence times and almost transform-limited photon emission can be observed simultaneously.
Creation of Silicon Vacancy Center in Detonation Nanodiamonds by High Temperature Annealing
Authors: Shimazaki Konosuke , Kawaguchi Hiroki , Takashima Hideaki , Segawa Takuya Fabian , So Frederick T.-K. , Terada Daiki , Onoda Shinobu , Ohshima Takeshi , Shirakawa Masahiro , Takeuchi Shigeki
Published: July 2023

Single-digit detonation nanodiamonds (DNDs) have attracted attention as single-photon emitters in many research fields. Here, the creation of silicon vacancy centers in DNDs by an annealing treatment up to 1100oC in high vacuum is reported.
Photon Pair Correlations in Semiconductor-Superconductor Light Sources
Authors: Bouscher Shlomi , Panna Dmitry , Balasubramanian Krishna , Jacovi Ronen , Kumar Ankit , Schneider Christian , Hoefling Sven , Hayat Alex
Published: July 2023

We demonstrate evidence of photon pair correlations, resulting from injected Cooper-pairs in superconductor-semiconductor structures. Such structures can be utilized for multiple applications including enhanced two-photon gain, electrically-driven entangled-photon generation and Bell-state analyzers.
FEC-free dense WDM transmission with Kerr soliton microcombs in crystalline MgF2 microresonators
Authors: Tanikawa Koya , Tasaka Shun , Fujii Shun , Tanaka Shuya , Kumazaki Hajime , Wada Koshiro , Kogure Soma , Kawanishi Satoki , Tanabe Takasumi
Published: July 2023

We demonstrated forward-error-correction (FEC)-free dense wavelength division multiplexing communication utilizing a Kerr soliton frequency comb generated from a high-Q crystalline microresonator with a 20-GHz free spectral range.
Liquid Crystal Integrated Tunable Micro-ring For Energy-Efficient Programmable Photonic Circuit
Authors: Kallega Rakshitha , Yazdani Hassan , Kumar G.V. Pavan , Selvaraja Shankar Kumar
Published: July 2023

We demonstrate a liquid crystal (LC) integrated tunable silicon ring resonator with in-plane electro-optic tuning performance of 0.87π/mW or 30 pm/V. We present the simulation, fabrication, and characterization results of the device.
Experimental Investigation on Parallel Extension of Optoelectronic Hybrid FIR Filter
Authors: Otsuka Shuhei , Sakamoto Takahide
Published: July 2023

We experimentally demonstrated parallel extension of optoelectronic FIR filters that flexibly increases the number of taps, enhancing filter resolution. The FIR filter resolution was doubled from 6.17 GHz to 3.09 GHz by the dual parallelization.
Numerical demonstration of spatial photonic Ising machine by using time-division multiplexing
Authors: Shimomura Suguru , Okubo Ken-ichi , Yamashita Hiroshi , Ogura Yusuke , Suzuki Hideyuki , Tanida Jun
Published: July 2023

In this study, we present a method for enhancing a function of the spatial photonic Ising machine by using time-division multiplexing. Processing of multiple signals in which spin interaction is encoded provides the representation of the Ising Hamiltonian which functions as an indicator to solve combinational optimization problems. To evaluate the performance of the proposed system, we calculated the Ising Hamiltonian by simulating light propagation. We confirmed that the optimal solution of a given Knapsack problem is effectively obtained by the proposed system.
Experiment on Decision Making for Multi-Armed Bandit Problem Using Chaos and Low Frequency Fluctuations in Laser Network
Authors: Sasaki Keigo , Mihana Takatomo , Kanno Kazutaka , Naruse Makoto , Uchida Atsushi
Published: July 2023

We experimentally demonstrate decision making for solving the multi-armed bandit problem using the dynamics of a semiconductor laser network. We compare the performance of decision making by using chaos and low-frequency fluctuations.
Polarization probe polarization imaging in NIR regime using liquid crystal polarization grating
Authors: Sakamoto Moritsugu , Nhan Huynh Thanh , Ono Yuki , Doi Kimitaka , Noda Kohei , Sasaki Tomoyuki , Tanaka Masayuki , Kawatsuki Nobuhiro , Ono Hiroshi
Published: July 2023

In this presentation, we propose and demonstrate a polarization probe polarization imaging system using a liquid crystal polarization grating in NIR regime. Our system should be applied to a remote sensing, product inspection, and biomedical-imaging.
CNN Technique for Speaker Recognition using Laser Microphone based on Self-coupling Effect of Laser Diode
Authors: Mizushima Daisuke
Published: July 2023

The low signal-to-noise ratio of laser microphone should be solved for the speech recognition applications. In this paper, the image recognition technique adapts to laser microphone. From experiments, the speaker recognition is achieved under limited conditions.
Mechanical pressure to reduce skin attenuation coefficient for infrared light
Authors: de Souza Raquel Pantojo , Dominguez Christian T. , Bachmann Luciano , Cardoso George C.
Published: July 2023

Phototherapies often require efficient light penetration into the skin. Using OCT, we found that gentle mechanical pressures of a few kilopascals, exerted by the light source on the skin, reduce dermis attenuation for IR light.
High sensitive fiber biosensor for Listeria monocytogenes detection
Authors: Chen Ling , Tian Jiajun , Yang Bang , Tang Kedi , Piao Dongze , Yao Yong
Published: July 2023

A label-free immunobiosensor with higher RI sensitivity of 1020 nm/RIU and 3696.8 nm/RIU at the RI range of 1.33 and 1.38 is successfully demonstrated for Listeria monocytogenes detection whose detection limit is 102 CFU/mL.
Tunable single frequency diamond Raman laser at 590-615 nm
Authors: Yang Xuezong , Feng Yan , Mildren Richard P.
Published: July 2023

Diamond Raman lasers provide a highly efficient scheme for achieving single frequency visible output based on Yb-doped fiber (YDF) lasers and frequency doubling technology. Here, a single-frequency laser tunable across 590 to 615 nm with output power up to 8 W is demonstrated in an intracavity frequency-doubled diamond Raman resonator. The spectral linewidth of the frequency doubling was less than 8 MHz. The results reveal a practical approach to obtain tunable high-power single-frequency laser in a wavelength region not well served by other laser technologies.
Thermally self-stabilized Brillouin laser in diamond
Authors: Jin Duo , Bai Zhenxu , Mildren Richard P. , Wang Yulei , Lu Zhiwei
Published: July 2023

We report a diamond-based, passive thermo-optical-locked continuous-wave high-power Brillouin laser. This laser outputs a power of 17.3 W with a root-mean-square amplitude variation of less than 1.9% over 60 mins.
Design of Scatterer Configuration for Spectral Optimization of Random Lasers
Authors: Okamoto Takashi , Kajisa Kouki , Ohshige Ryo
Published: July 2023

The two-dimensional structure of a random gain medium was designed to obtain the specified emission spectrum from a random laser. Structural optimization was performed using a direct binary search method. The simulation results showed that the emitted light can be concentrated within one or more specific wavelength ranges. The effect of the fabrication errors on the optimized laser emission spectrum was also examined.
Handedness control of watt-level 1173 nm vortex mode output from a self-Raman Nd:GdVO4 laser
Authors: Ma Yuanyuan , Sugahara Haruna , Lee Andrew J. , Pask Helen M. , Miyamoto Katsuhiko , Omatsu Takashige
Published: July 2023

We demonstrate, for the first time of the best of our knowledge, the handedness control of a continuous-wave 1173 nm optical vortex output from a self-Raman Nd:GdVO4 laser by employing an off-axis pumping geometry. Maximum vortex output of over 1.2 W was achieved.
Direct bonded microchip gain aperture laser system
Authors: Kausas Arvydas , Tsuji Akihiro , Yahia Vincent , Taira Takunori
Published: July 2023

We report on gain apertured pre-amplifier system for a microchip laser with beam cleaning stage. Increase in output is expected by use high peak power pump laser diodes both for oscillator and pre-amplifier. In addition, bonded chips for efficient heat removal are incorporated into setup in order to improve overall system performance.
Mode-locked and Cavity-dumped Cr:LiSAF Lasers Far Off The Gain Peak: Tunable ns and fs Pulses Near 1 µm
Authors: Demirbas Umit , Thesinga Jelto , Kellert Martin , Reuter Simon , Sumpf Bernd , Pergament Mikhail , Kärtner X.
Published: July 2023

We have developed Cr:LiSAF oscillators around 1 µm, producing sub-200-fs pulses with 80pJ energy at 150 MHz and 2.5-500 ns pulses with 100nJ energy at 100 kHz in mode-locked and cavity-dumped regimes, respectively.
Broadband and Efficient Out-Coupling of Intra-Cavity High Harmonics by a Coated Grazing-Incidence Plate
Authors: Fischer Julian , Drs Jakub , Labaye François , Modsching Norbert , Müller Michael , Wittwer Valentin J. , Südmeyer Thomas
Published: July 2023

We develop and implement a coated grazing-incidence-plate for broadband out-coupling of XUV light generated inside a 45-fs thin-disk laser oscillator. We reach >25% XUV out-coupling efficiency for photon energies between 10 to 60 eV.
Attosecond electron dynamics in molecules, clusters and liquids
Authors: Wörner Hans Jakob
Published: July 2023

The measurement of photoionization delays from isolated molecules over clusters to liquids and the first observation of decoherence and revival of attosecond charge migration in a neutral molecule will be presented.
Green Home Applications by fs Laser-based Laser-Induced-Graphene Formation Technology on Woods
Authors: Nam Han Ku , Le Truong-Son Dinh , Yang Dongwook , Lee Younggeun , Kim Byunggi , Kim Young-Ryeul , Kim Seung-Woo , Kim Young-Jin
Published: July 2023

High quality Laser-Induced-Graphene formation on wood by using femtosecond-laser-direct-writing technology is demonstrated for green and smart construction applications. Graphene based heater, temperature sensor, boiler, and inter-connecting electrodes on woods were fabricated.
Fabrication of laser-induced graphene-based diffractive optical device using femtosecond laser
Authors: Lee Younggeun , Yang Dongwook , Nam Han Ku , Le Truong-Son Dinh , Kim Young-Ryeul , Kim Byunggi , Yoo Hongki , Lee JooHyung , Yoon Hyo-sang , Kim Seung-Woo , Kim Young-Jin
Published: July 2023

This is a study to generate laser-induced graphene on colorless polyimide using a femtosecond laser, and to find applications and applications for it as various types of Fresnel zone plates and diffractive optical devices.
High-speed ablation of crystalline silicon by femtosecond laser BiBurst mode with GHz burst in MHz burst
Authors: Obata Kotaro , Caballero-Lucas Francesc , Kawabata Shota , Miyaji Godai , Sugioka Koji
Published: July 2023

We demonstrate highly efficient ablation of silicon by use of BiBurst mode, which is composed of GHz bursts in MHz bursts. Ablation by the conventional irradiation scheme of femtosecond laser pulses (single-mode) generates detrimental damage on the ablated surface due to air ionization at the intensity above a critical value. In contrast, the BiBurst mode ablation can prevent the air ionization at the input power equal to or even higher than the single-mode due to lower intra-pulse intensities. Thus, BiBurst mode can achieve 23 times ablation speed without degrading the ablation quality compared to that by the single-mode ablation under the conditions that avoid the air ionization.
Comprehensive Research on LIPSS Formation on ZnO Substrates by Ultrafast Laser Irradiation
Authors: Bai Shi , Obata Kotaro , Sugioka Koji
Published: July 2023

A comprehensive research is conducted to fabricate laser-induced periodic surface structures (LIPSS) with different morphologies on zinc oxide substrates by ultrafast laser. 1-dimensional or 2-dimensional LIPSS can be created depending on types of laser polarizations.
Femtosecond Laser Processed Web-like Silicon Nanostructures and Application in Surface Enhanced Raman Spectroscopy
Authors: Beeram Reshma , Banerjee Dipanjan , Mangababu A. , Rao Soma Venugopal
Published: July 2023

Web-like Si nanostructures were fabricated by laser ablation of Silicon in air with a femtosecond laser oscillator. Further, after gold coating, these nanostructures were used for SERS studies with methylene blue as a probe molecule.
Polarization multiplex dual-comb fiber laser for precise spectroscopy
Authors: Takahashi Aki , Okubo Sho , Iwakuni Kana
Published: July 2023

Dual-comb spectroscopy (DCS) has offered new approach for precise molecular spectroscopy. Recently, dual-comb laser attracts a lot of attention as an alternative to the conventional DCS owing to relatively simple architecture. However, most of dual-comb lasers are supposed to be used under free-running operation and their performance might be not suitable for precise spectroscopy. In this work, a new dual-comb laser, which is polarization-multiplex NALM-based mode-locked laser with gain sharing, is developed. The laser cavity has electro-optic phase modulator to control the cavity length, expecting high mutual phase stability in the short-term region as well as in the long-term region. The output spectra from the cavity are well overlapped with frep of 59 MHz and Δfrep of 116 kHz. The stability of Δfrep under free-running operation is investigated and Allan deviation of 0.025 Hz at 1 s averaging times is obtained.
Comb-line Resolved Dual-comb Spectroscopy Using Free-Running Mechanical Sharing Combs
Authors: Tian Haochen , Li Runmin , Endo Takeru , Asahara Akifumi , Sterczewski Lukasz A. , Minoshima Kaoru
Published: July 2023

Phase digital correction is applied to the interferograms sampled from free-running mechanical sharing combs, resulting RF comb modes with > 50 dB SNR. Absorption of hydrogen cyanide gas is verified at 1559.8 nm.
Mode-spacing multiplication of optical frequency combs without power loss
Authors: Hasegawa Taro , Kageyama Taiki
Published: July 2023

We demonstrate multiplication of optical frequency comb mode spacing by interleaving and phase demodulation. This scheme provides mode spacing multiplication without power loss in principle, in contrast to the conventional method of mode filtering technique.
Distance Measurement Based on a Coherently Synthesized Two-color EO Comb towards High-accuracy Air-refractive Index Self-Correction
Authors: Li Runmin , Tian Haochen , Kato Takashi , Asahara Akifumi , Minoshima Kaoru
Published: July 2023

A distance measurement system with <1 µm resolution is demonstrated based on a coherently synthesized two-color EO comb. Air-refractive index self-correction is possible through measuring the optical distances that follow group and phase refractive indices.
Spectral Characterization of Parametric Biphoton States Enabled by Frequency-to-time Mapping Technique
Authors: Kashi Anahita Khodadad , Wetzel Benjamin , Kues Michael
Published: July 2023

Spectral correlations of a biphoton state from a parametric process are characterized with the use of the well-developed frequency-to-time mapping technique, enabling the first demonstration of the Hanbury Brown and Twiss experiment in frequency domain.
Stimulated Raman scattering imaging with quantum-enhanced balanced detection
Authors: Xu Zicong , Oguchi Kenichi , Taguchi Yoshitaka , Miyawaki Yu , Sano Yuki , Takahashi Shun , Harashima Fumiya , Cheon Donguk , Katoh Kazuhiro , Ozeki Yasuyuki
Published: July 2023

We demonstrate the experimental realization of a high-power quantum-enhanced stimulated Raman scattering (QE-SRS) microscopy. By using a 25-mW squeezed light, we achieved 1.74±0.28 dB quantum enhancement in high-speed hyperspectral SRS imaging.
Effect of detuning on noise characteristics in a microcomb-based light source
Authors: Kogure Soma , Fujii Shun , Kumazaki Hajime , Sota Shota , Hashimoto Yosuke , Kobayashi Yuta , Araki Tomohiro , Tanabe Takasumi
Published: July 2023

We investigated the pump effective detuning dependence of noise and linewidth characteristics of modulation instability combs. Modulation instability combs are useful for applications if the detuning is smaller than several times the resonace linewidth.
Silicon-on-Insulator Architectures for Brillouin scattering
Authors: Subham B Om , A. Siva Shakthi , Venkataraman Vivek , Selvaraja Shankar K. , Choudhary Amol
Published: July 2023

We report Brillouin scattering gain in two novel Silicon-on-Insulator architectures – double slab and double-lobed waveguides. We show that the geometrical parameters influence the Brillouin gain and frequency shift, thereby offering flexibility to maximize gain.
Observation of Motion and Discrimination of Targets using Si FMCW LiDAR Chip
Authors: Suyama S. , Tamanuki T. , Nawa S. , Ito H. , Abe H. , Baba T.
Published: July 2023

We used a Si FMCW LiDAR chip with a slow-light grating beam scanner to image the motion of objects. Living objects and fixed solid objects can be distinguished from Doppler shifts in the range signal.
Hybrid Quantum Systems using Optical Nanofibers Integrated with Cold Rubidium Atoms
Authors: Chormaic Síle Nic , Vylegzhanin Alexey , Shahrabifarahani Zohreh , Raj Aswathy , Gupta Ratnesh Kumar , Brown Dylan , Everett Jesse L.
Published: July 2023

We discuss work on the integration of optical nanofibers with cold atoms. We focus on two aspects, one related to Rydberg atom formation mediated by the nanofiber and the other to optimizing atom trapping.
Layered Hybrid Perovskites: From Supramolecular Templating to Multifunctional Materials
Authors: Milić Jovana V.
Published: July 2023

Hybrid organic-inorganic perovskite materials have become one of the most promising semiconductors in optoelectronics, yet their instability under operating conditions obstructs their application.[1] This has stimulated a range of strategies to address this challenge, including the development of low-dimensional or layered perovskite architectures comprising of organic spacer moieties templating hybrid perovskite slabs.[2] We purposefully tailor supramolecular interactions with the organic components to template hybrid perovskite architectures,[3–6] such as through halogen bonding[4] or π-based interactions,[5–6] as well as host-guest complexation,[7] which has been uniquely assessed by solid-state NMR crystallography. As a result, we have achieved perovskite solar cells with superior operational stabilities without compromising their photovoltaic performances,[3,5,7] which provides a versatile strategy for hybrid perovskite photovoltaics. Moreover, we have extended the functionality of the organic spacer layers by introducing electroactive components into layered hybrid perovskite frameworks[8–9] and exploiting their mechanochromism,[10] providing a new platform for advanced optoelectronic applications.
Integrated lithium niobate photonics: when performance meets scalability
Authors: Zhang Mian
Published: July 2023

Thin film lithium niobate photonics can provide high performance and scalable solution for optical communication and many emerging applications. We discuss the advantage, challenge and future promises of this platform.
Ultrastrong Light-Matter and Matter-Matter Coupling
Authors: Kono Junichiro
Published: July 2023

This talk will describe our recent studies of light-matter and matter-matter coupling phenomena in condensed matter in the ultrastrong coupling regime.
Controlling Emission Wavelength and Chirality of Quantum Emitters in 2D Heterostructures
Authors: Htoon Han
Published: July 2023

Quantum emitters capable of operating in previously in assessable telecommunication wavelength range were realized in MoTe2 multilayers. Proximity induced chiral quantum light generation is also achieved via strain-engineering of WSe2/NiPS3 heterostructures.
High-speed live-cell vibrational imaging with a mid-infrared photothermal quantitative phase microscope
Authors: Ishigane Genki , Toda Keiichiro , Tamamitsu Miu , Shimada Hiroyuki , Ideguchi Takuro
Published: July 2023

We demonstrate high-speed live-cell imaging at 50 frames/s with a mid-infrared photothermal quantitative phase microscope by implementing nanosecond pulsed lasers and a high-full-well-capacity image sensor.
Transcutaneous monitoring of hemoglobin derivatives using camera-based diffuse reflectance spectroscopy
Authors: Nishidate Izumi
Published: July 2023

This paper describes a simple and affordable imaging technique to evaluate transcutaneously hemoglobin derivatives including methemoglobin and multiple physiological parameters such as heart rate, respiratory rate, and hemoglobin oxygen saturation using a digital red-green-blue camera.
Widefield Heterodyne Optical Coherence Microscopy for Volumetric Vibration Imaging
Authors: Choi Samuel , Yoshimizu Kaito , Ota Takeru , Nin Fumiaki , Hibino Hiroshi , Muramatsu Shogo , Suzuki Takamasa
Published: July 2023

We propose a method for simultaneous tomographic vibration visualization of an entire volume of a target object using a scanning low-coherence interferometric microscope. By combining the difference frequency component produced by the phase modulated reference beam and the object vibration into the time-domain OCT signal, we could capture the internal vibration distribution at a frequency of 43 kHz, which far exceeds the frame rate of the CMOS image sensor as a detector, with 25 nm sensitivity.
Quantitative Evaluation of Raman Scattering Intensity Enhanced by Propagating Surface Plasmon Resonance
Authors: Honda Koichi , Ishitobi Hidekazu , Inouye Yasushi
Published: July 2023

The incident angle dependence of Raman scattering intensity of Rhodamine 6G enhanced by propagating surface plasmon resonance was quantitatively evaluated, and the dependence was found to be in good agreement with electromagnetic field analysis.
Light powered nanomotors and control of light momentum via engineering localized plasmon resonances
Authors: Tanaka Yoshito Y. , Shimura Tsutomu
Published: July 2023

We demonstrate a linear nanomotor using lateral optical force due to directional side scattering by a plasmonic nanoparticle. We also propose of the nanomotors with different functions, direction-controllable nanomotor and nonlinear optical nanomotor.
Trapping of poly (N-isopropylacrylamide) by optical tweezers using silver plasmon
Authors: Nishiguchi Maho , Kubota Maho , Yuyama Ken-ichi , Nakata Yoshiki , Tsuboi Yasuyuki
Published: July 2023

We trapped a water-soluble chain polymer by silver plasmonic optical tweezers. Three types of silver plasmonic nanostructures were examined as substrates. We demonstrate that silver plasmonic optical tweezers are a powerful tool for manipulation of nanomaterials.
Frequency-shifted feedback mode-locked and tunable 3.5 µm fiber laser and Bragg grating interrogator
Authors: Henderson-Sapir Ori , Bawden Nathaniel , Theodosiou Antreas , Majewski Matthew R. , Kalli Kyriacos , Jackson Stuart D. , Ottaway David J.
Published: July 2023

A mode-locked, dual-wavelength pumped 3.5 µm fiber laser using frequency-shifted feedback is reported. Pulses of 3.8 ps with 8.7 nJ were obtained. An electronically wavelength swept, mid-IR interrogator is built to characterize a mid-IR fiber Bragg grating.
Numerical Analysis on the Effects of Spectral Ripple for Saturable Absorber Based Mode-Locking
Authors: Liu Bowen , Yamashita Shinji , Set Sze Yun
Published: July 2023

We report numerical study on spectral ripple effects in a mode-locked fiber laser towards steady single-pulse states. Maps of nonlinear saturable absorption threshold required for stable mode-locking generation are explored. Ripple cancellation is also demonstrated.
Scalable Quantum Dot Single-photon Sources Based on Dual-mode Waveguides
Authors: Midolo L. , Papon C. , Zhou X. , Uppu R. , Wang Y. , Scholz S. , Wieck A. D. , Ludwig A. , Lodahl P.
Published: July 2023

We present a photonic integrated circuit for the simultaneous resonant excitation of two distinct InAs quantum dots and for the generation of coherent streams of single photons, towards on-chip quantum information and computing.
Generalized Stokes-space analysis of modal dispersion in fibers for space-division multiplexing with mode-dependent loss
Authors: Antonelli Cristian , Mecozzi Antonio , Shtaif Mark , Fontaine Nicolas , Chen Haoshuo , Mazur Mikael , Ryf Roland
Published: July 2023

We present a unified model for modal dispersion and mode-dependent loss in fibers for space-division multiplexed transmission. The proposed model, based on a generalized Stokes-space representation of multi-modal fields, is validated by comparison with experimental data.
Cumulative Dynamic Inter-Core Skew Measurements in Spooled Uncoupled Core Multicore Fibers
Authors: Luis Ruben S. , Puttnam Benjamin J. , Rademacher Georg , Awaji Yoshinari , Furukawa Hideaki
Published: July 2023

We measured the propagation delay fluctuations and dynamic inter-core skew of 125 µm cladding, 4-core fibers with 15.7, 29.5, and 50 km lengths. The measurements provide insight on the skew dependence on transmission distance.
Ultrafast and high-power green micro-LED for visible light communications
Authors: Wang Junfei , Ma Chicheng , Li Dong , Hu Junhui , Yi Shulan , Wang Shanshan , Hou Yuqi , Ma Yingnan , Shi Jianyang , Zhang Junwen , Li Ziwei , Chi Nan , Shen Chao
Published: July 2023

High power green micro-LED is essential for extending the range of free-space and underwater visible light communication systems. We demonstrate a ~520nm micro-LED with 11.5mW output power, achieving a data rate of 3.77Gbps.
Simulations of two-well THz-QCL structures with non-equilibrium Green’s function method
Authors: Yasuda Hiroaki , Sekine Norihiko , Hosako Iwao
Published: July 2023

We designed a two-well terahertz quantum cascade laser that has the highest gain in the positive differential conductance region and confirmed better THz-QCL performance by using the non-equilibrium Green’s function method.
Metamaterial Thermoelectric Generation under Uniform Temperature Environment
Authors: Kubo Wakana
Published: July 2023

We propose a thermoelectric device that can produce a thermal gradient even in a uniform-temperature environment.
Phase Modulated Frequency Comb Seed Source for High Power Spectral Beam Combining
Authors: Arora Shilpi , C.G. Lakshmi , Vikram B.S. , Supradeepa V.R.
Published: July 2023

We have demonstrated a seed laser architecture that can be used for spectral beam combining to generate high output powers from a single laser. The proposed method reduces stimulated Brillouin scattering through line shape control.
Mode-locking of an Erbium doped fiber laser using a Ti2AlN based saturable absorber
Authors: Kwon Suh-young , Lee Jinho , Lee Ju Han
Published: July 2023

The feasibility of using MAX phase Ti2AlN for fiber laser mode-locking at 1.5-μm wavelengths was investigated. Our Ti2AlN-based saturable absorber with a ~7% modulation depth was successfully used for generation of ~4.62-ps pulses.
Terahertz Time-Domain Spectroscopy using Chirped-Pulse Up-Conversion with Dispersion Compensation
Authors: Tamaki Ryo , Suzuki Masashi , Takeda Jun , Katayama Ikufumi
Published: July 2023

Chirped-pulse up-conversion was applied to detect an accurate terahertz waveform. The waveform distortion was suppressed by using dispersion compensation via the chirped-pulse up-conversion, providing a scheme for terahertz time-domain spectroscopy on a single-shot basis.
Interlayer Phonon Modes of MoSe2 and WSe2 Observed by THz Emission Spectroscopy
Authors: Afalla Jessica C. , Muldera Joselito E. , Takamizawa Semmi , Fukuda Takumi , Ueno Keiji , Tani Masahiko , Hase Muneaki
Published: July 2023

Terahertz (THz) time domain emission spectroscopy was performed on bulk single crystal MoSe2 and WSe2. Results show THz emission signals which comprise of a single cycle transient current-driven signal and damped oscillatory signals arising from coherent phonon modes. The damped oscillations have frequencies below 1 THz and are attributed to interlayer shear and breathing modes.
Ultrabroadband infrared coherent spectroscopy using solids as nonlinear media
Authors: Matsubara Eiichi , Ashida Masaaki
Published: July 2023

The use of multiple thin fused-silica plates for pulse compression and that of a single crystal of diamond for detection have been found to contribute to the efficient and stable ultrabroadband infrared coherent spectroscopy.
Single-shot Detection of Terahertz Radiation Waveform Emitted from Femtosecond Laser Ablation
Authors: Tamaki Ryo , Kasai Tatsuki , Asai Gaku , Hata Daiki , Kubo Hajime , Takigawa Yuichi , Takeda Jun , Katayama Ikufumi
Published: July 2023

Initial charge emission dynamics during femtosecond laser ablation was visualized by detecting the terahertz radiation waveform using a highly sensitive single-shot terahertz spectrometer. Pulse-to-pulse changes of the terahertz waveforms were clearly observed.
Characteristics of Terahertz Notch Filter using Two Monolayer Guided-Mode Resonance Filters
Authors: Bark Hyeon Sang , Kim Gyeong-Ryul , Park Mun-Won , Jang Kyu-Ha , Lee Kitae , Jeong Young Uk , Jeon Tae-In
Published: July 2023

We present the THz transmission characteristics of a guided-mode resonance (GMR) notch filter made of all-dielectric material. When the polarization angle for the ideal 1-D GMR filter changes from 0° to 180°, the transmittance variation changes from 0 to 1 as a function of cos2 (Φ), where Φ is polarization angle. However, if the second filter is installed at a rotation angle between 0° and 90° compared to the first filter, then the transmittance ranges for the polarization angles change from 0 to any value less than 1.
A compact optical set-up to create high-order vectorial structured light beams
Authors: Kumar Praveen , Nishchal Naveen K. , Omatsu Takashige , Rao A Srinivasa
Published: July 2023

Structured light beams having non-uniform polarization distributions are of huge interest for many optical applications. This paper describes a method to generate vectorial structured beams using a compact and flexible experimental set-up. A single SLM with calibrated phase response has been used for phase modulation through on-axis configuration. Experimental results have been presented.
Micro Raman Tomographic Imaging on Laser Beam Internal Damage into Sapphire for Laser Cleaving Process
Authors: Onuki Teppei , Kuroda Junnosuke , Kaneko Kazuki , Ojima Hirotaka , Shimizu Jun , Zhou Libo
Published: July 2023

Controllability of laser induced damages (LID) in sapphire using focused ultrashort pulsed laser beam has been studied to develop kerf-loss less slicing process in wafer manufacturing by scanning focus spot into sapphire ingot. Micro Raman tomographic imaging technique (µRTI) is used for nondestructive measurement of LID, and residual stress accompanied with damaging marks. Stress field distribution can be observed surrounding LID at 15 micron-depth from the surface, in the tomographic images with the peak features of 2D Raman spectral dataset. The severity of LID mark could be controlled by the energy and the shot number of laser pulses at a spot area.
Microfabrication using Laser-Induced Bubble (microFLIB) of thermoset polymer and its potential techniques
Authors: Hanada Yasutaka
Published: July 2023

We present microFabrication using Laser-Induced Bubble (microFLIB) of thermoset polymer PDMS. The fundamental characteristics of microFLIB reveals some advantages over the conventional laser direct writing techniques. We also discuss potential techniques of the microFLIB.
Strong Phase-Noise Suppression of a Kerr Comb via Synchronization to an Optical Parametric Oscillator
Authors: Jang Jae K. , Zhao Yun , Okawachi Yoshitomo , Ji Xingchen , Lipson Michal , Gaeta Alexander L.
Published: July 2023

We demonstrate near-complete suppression of phase noise associated with thermo-refractive noise in microresonator Kerr soliton comb via all-optical synchronization of the comb to an optical parametric oscillator all on a single silicon-nitride chip.
Wide-field mid-infrared imaging based on adiabatic frequency upconversion
Authors: Fang Jianan , Huang Kun , Yan Ming , Wu E , Zeng Heping
Published: July 2023

Adiabatic frequency upconversion based on a chirped-poling nonlinear crystal was used to realize a large-field-of-view mid-infrared imaging, which further facilitated unprecedented performances with single-photon sensitivity and a MHz-level frame rate.
Fast and Accurate Dual-Comb Spectroscopy with Mid-Infrared Quantum Cascade Laser Frequency Combs
Authors: Komagata Kenichi N. , Vogel Simon , Wittwer Valentin J. , Bertrand Mathieu , Schilt Stéphane , Faist Jérôme , Südmeyer Thomas , Emmenegger Lukas , Gianella Michele
Published: July 2023

We present a dual-comb spectrometer combining absolute frequency accuracy (600-kHz), fast acquisition (54-ms), and broadband mid-infrared coverage (40-cm-1) near 1300 cm-1. These unique characteristics are realized by chip-based quantum cascade laser frequency combs.
Coherent optical-to-terahertz down-conversion via photomixing of comb-rooted optical frequencies
Authors: Shin Dong-Chel , Kang Guseon , Kim Byung Soo , Kim Young-Jin , Kim Seung-Woo
Published: July 2023

Coherent down-conversion of an optical reference for the terahertz domain is demonstrated, yielding a residual instability of 3×10–15 at 1-s and a residual phase noise of −53.2 dBc/Hz at 1 Hz offset.
Generation of a mW-class broadband mid-infrared comb using a waveguide-type PPLN crystal and its application to dual-comb spectroscopy
Authors: Yoshii Kazumichi , Kuse Naoya , Inoue Kazuki , Mitsumoto Ryo , Nakajima Yoshiaki , Yasui Takeshi , Minoshima Kaoru
Published: July 2023

We generated a broadband mid-infrared comb of 2.7-4.6 μm with an output of 2.7 mW based on an Er:fiber comb as a fundamental light using a waveguide-type PPLN crystal. A dual-comb spectrometer using these combs was developed.
Mid-infrared Dual-comb Spectroscopy using Bidirectional Dual-comb Fiber Laser for Greenhouse N2O Gas Detection
Authors: Li Jiajie , Asahara Akifumi , Tian Haochen , Yoshii Kazumichi , Kato Takashi , Nakajima Yoshiaki , Minoshima Kaoru
Published: July 2023

We demonstrate mid-infrared dual-comb gas spectroscopy using a bidirectional dual-comb fiber laser. Without complex tight-locking, we detect N2O absorption lines consistent with HITRAN database. The developed scheme is useful for practical greenhouse gas detection.
Femtosecond Laser Direct Writing of Path Encoded Two-qubit and Multiqubit Photonic Quantum Gate Chips
Authors: Li Meng , Li Chu , Chen Yang , Feng Lan-Tian , Ren Xi-Feng , Gong Qihuang , Li Yan
Published: July 2023

We demonstrate the first realization of path encoded two-qubit photonic quantum gate chip for generating Bell states, three-qubit Toffoli gate and four-qubit Controlled-Controlled-Controlled NOT gate via combining logic gates together by femtosecond laser direct writing.
Single- and Multi-Phonon Subtraction to a Mechanical Thermal State via Optomechanics
Authors: Svela A. Ø. , Enzian G. , Freisem L. , Price J. J. , Clarke J. , Shajilal B. , Janousek J. , Buchler B. C. , Lam P. K. , Vanner M. R.
Published: July 2023

By heralding events of single- and multi-phonon subtraction to a mechanical thermal state in a Brillouin optomechanical system and using heterodyne tomography, we observe non-Gaussianity in the s-parameterised Wigner phase-space distribution.
Cold Atomic Demonstration of Datta-Das Transistor
Authors: Madasu Chetan Sriram , Hasan Mehedi , Rathod Ketan , Kwong Chang Chi , Wilkowski David
Published: July 2023

We experimentally demonstrate an atomtronic analog of the Datta-Das transistor using ultracold atoms, where a sensitive control of the spin rotation in the gate region is achieved using three gaussian beams.
Strontium-88 cold atomic source with double color Zeeman slower
Authors: Li Jianing , Das Swarup , Kwong Chang Chi , Zanon Thomas , Lan Shau-Yu , Wilkowski David
Published: July 2023

We design and build up a compact Strontium atomic source based on a new scheme of double-frequency and cross polarization Zeeman slower. With the atomic flux of 2.3×109 atom/s, we aim to demonstrate inertial quantum sensing using clock transition of bosonic strontium-88 atoms.
400-m-Long Polarization-Maintaining Fibers for Magneto-Optical Trapping of Francium Atoms
Authors: Nakamura Keisuke , Nagase Shintaro , Nakashita Teruhito , Hayamizu Tomohiro , Aoki Takatoshi , Nagahama Hiroki , Ozawa Naoya , Sato Motoki , Yamane Kazeki , Fukase Mirai , Uehara Daisuke , Takamine Aiko , Sakemi Yasuhiro
Published: July 2023

We installed a 400-m-long polarization-maintaining fibers for magneto-optical trapping of Francium atoms. Fiber polarization stability of ~9×10-4 was achieved with an averaging time of 10 seconds, which even allows fluorescence observation at 20 atoms.
Efficient graphene-based photodetector with an asymmetric hybrid plasmonic waveguide
Authors: Ono Masaaki , Yoshioka Katsumasa , Nozaki Kengo , Shinya Akihiko , Notomi Masaya
Published: July 2023

We designed a compact photodetector with a graphene-loaded hybrid plasmonic waveguide that enhances light absorption to 32.1% for a 5-µm length. The asymmetric structure generates photovoltage by the photothermoelectric effect without dark current.
Towards >100 Tb/s Ultra-Wideband Transmission Systems
Authors: Renaudier J. , Calo C. , Ghazisaeidi A.
Published: July 2023

We report on the use of semiconductor optical amplifiers to enlarge optical bandwidth of next generation WDM systems. We review recent advances and achievements paving the way for >100 Tb/s fiber communications systems.
Real-time 80 × 200-Gb/s DWDM Transmission over 3600-km G.652.D Fiber with 6-THz Bandwidth C-Band Amplifiers
Authors: Feng Lipeng , Zhang Anxu , Zhang Rong , Ma Yingqing , Lv Kai , Kang Kai , Lou Xiaowei , Huo Xiaoli , Li Junjie
Published: July 2023

We successfully demonstrate a record real-time transmission over 3600-km G.652.D fiber with at least 7.9-dB OSNR margins using commercially available 200-Gb/s PDM-QPSK transponders, which reserves more than 3-dB engineering link budget for each 100-km span.
3-Dimensional Constellation Shaping in High Spectral Efficiency Multidimensional Optical Transmission
Authors: Park Jinwoo , Lee Joung-Moon , Ha Inho , Han Sang-Kook
Published: July 2023

Multidimensional optical modulation is critical in next-generation optical communication to achieve high spectral efficiency. 3-Dimensional geometric and probabilistic constellation shaping technique is proposed in multidimensional optical modulation and performance is verified with transmission simulation.
Modulation Format Conversion From Three BPSK to One 8QAM Based on Coherent Interference and XPM
Authors: Ishida Taiga , Kishikawa Hiroki , Fujikata Junichi
Published: July 2023

Modulation format conversion from three BPSK to one 8QAM based on coherent interference and cross phase modulation is proposed. Calculated BER performance and constellation diagram show that error-free conversion can be achieved.
Performance Enhancement of 4-D QAM-MDPSK Optical Transmission Using Set-Partitioning
Authors: Lee Joungmoon , Ha Inho , Park Jinwoo , Han Sang-Kook
Published: July 2023

In multidimensional optical modulation combining both optical intensity and phase signals, inter-dimensional interference (IDI) occurs which degrades the error performances. We propose 4-D set partitioning QAM-MDPSK optical transmissions which lowers the error floor effectively, and more than 3 dB SNR gain was obtained in simulations.
Overview of COVID-19
Authors: Tamiya Eiichi
Published: July 2023

The pandemic caused by the new coronavirus began in 2019 and was named COVID-19; unlike the pandemic of 100 years ago, humans have been able to rapidly identify this virus, establish diagnostic methods from infection to disease onset, and try to prevent the spread of infection. Photonics has contributed extremely much to them. An overview of photonics to fight COVID-19 was presented here.
Non-Contact Aerial Interfaces
Authors: Yamamoto Hirotsugu
Published: July 2023

Non-contact interfaces are expected to be immune to infectious diseases. Aerial display with 3D sensing enables us directly to handle information without physical touch. This paper reviews recent developments and prospects of aerial display.
Solid State VCSEL Beam Scanners for 3D Sensing
Authors: Koyama Fumio
Published: July 2023

We review our recent activities on solid-state 1D and 2D VCSEL beam scanners for 3D sensing, exhibiting high resolutions of 1,400 and 33,000, respectively. We show the time-of-flight 3D real-time sensing over 60m distance.
Photonic Integrated Circuits for LiDAR: Solid-State 2D Beamsteering
Authors: Dahlem Marcus S. , Prost Mathias , Dwivedi Sarvagya , Kjellman Jon Ø. , Figeys Bruno , Kongnyuy Tangla D. , Marinins Aleksandrs , Saseendran Sandeep S. , Soussan Philippe , Rottenberg Xavier , Jansen Roelof , Bogaerts Wim
Published: July 2023

In this work, we summarize our recent advances in 2D beamsteering using optical phased arrays operating in NIR and SWIR wavelengths, covering different architectures and steering techniques based on active phase shifting and wavelength tuning.
Mode-locking state switchable Er-doped fiber laser based on a hybrid scheme of graphene oxide and nonlinear polarization rotation
Authors: Cai Wei , Cheng Chih-Hsien , Ye Guanyu , Jin Lei , Li Li , Set Sze Y. , Yamashita Shinji
Published: July 2023

We demonstrated a mode-locking state switchable Er-doped fiber laser based on the hybrid mode-locking scheme composed by nonlinear polarization rotation and graphene oxide coated side-polished fiber. Four stable switchable mode-locking states were confirmed.
Cascaded Wavefront-Matching-Method Designed Mode-Exchangers for MDL Management in MDM Transmission
Authors: Asama Yuichi , Fujisawa Takeshi , Sato Takanori , Mori Takayoshi , Sakamoto Taiji , Imada Ryota , Yamashita Yoko , Nakajima Kazuhide , Saitoh Kunimasa
Published: July 2023

6-mode-exchangers composed of side- and top-grating-like waveguides designed with an optimization algorithm is proposed for mode-division-multiplexing system. By cascading these devices, an efficient reduction of mode-dependent-loss is possible with only one-time mode exchanging operation.
Time reversed optical waves by arbitrary vector spatiotemporal field generation
Authors: Carpenter Joel , Mounaix Mickael , Fontaine Nicolas K. , Neilson David T. , Ryf Roland , Chen Haoshuo , Alvarado-Zacarias Juan Carlos
Published: July 2023

We demonstrate how to generate arbitrary optical vector fields in the full C band (1535nm - 1570nm), with a new class of ultrafast wavefront shaper. A device capable of generating a sequence of arbitrary 2D spatial/polarization wavefronts at a bandwidth-limited rate of 4.4 THz.
A low crosstalk optical wavelength filter consisting of a Si arrayed-waveguide grating and Bragg grating tunable filters
Authors: Yagi Yuta , Tsuda Hiroyuki
Published: July 2023

A low crosstalk optical wavelength filter consisting of a Si arrayed-waveguide grating and Bragg grating tunable filters was designed and fabricated. The simulation results indicated the crosstalk of the optical wavelength filter was dramatically improved.
Integrated Microwave Photonics for Radar Applications
Authors: Serafino Giovanni , Maresca Salvatore , Reza Manuel , Porzi Claudio , Malacarne Antonio , Scotti Filippo , Ghelfi Paolo , Bogoni Antonella
Published: July 2023

Integrated microwave photonics enables high-performance, compact, and rugged radar systems for applications in diverse domains. This paper provides a brief overview of promising photonic integrated solutions for maritime surveillance and Earth observation.
Demonstration of highly efficient EO polymer modulator in visible light
Authors: Kamada Shun , Ueda Rieko , Yamada Chiyumi , Tanaka Kouichi , Yamada Toshiki , Otomo Akira
Published: July 2023

We demonstrated the optical modulator using electro-optic polymers at visible wavelength. Modulation properties was evaluated using a Mach-Zehnder interferometer. The modulator was driven at wavelength 640 nm and successfully operated at a low voltage-length product.
Metasurfaces for molecular emitter
Authors: Nishijima Yoshiaki
Published: July 2023

We demonstrate extraordinarily spectrally selective narrowband mid-infrared radiation absorbance and thermal emittance with the strong surface enhancement of molecular infrared absorption (SEIRA) using mid-midinfrared metasurfaces. This was achieved by harnessing mode coupling between a plasmonic metal-insulator-metal (MIM) metasurface and molecular vibrational mode resonances. We found that the weak/strong coupling has a high potential for the future application of thermal emitters for mid-infrared light sources. We will present recent advances in the coupling of molecular vibration and metasurfaces.
Phase calculation scheme for designing highly customizable metalens-based devices
Authors: Li Hongliang , Zhou Changyi , Lee Woo-Bin , Choi Duk-Yong , Lee Sang-Shin
Published: July 2023

A phase calculation scheme, which gives required phase profiles extracted from pre-designed geometric lenses, was proposed and demonstrated for designing highly customizable metalens-based devices expanding the related research and practical applications.
Nonlocality-enabled Topological Engineering Towards New Applications of Anisotropic Metamaterials
Authors: Janaszek Bartosz , Kieliszczyk Marcin , Tyszka-Zawadzka Anna , Szczepanski Pawel , Li Xiaowei , Huang Lingling , Su Zhaoxian , Gong Yandong
Published: July 2023

We investigate topological phase transitions of iso-frequency of dispersion of anisotropic metamaterials via use of nonlocality engineering, which may lead to optical isolation or simultaneous generation of orthogonally polarized beams at different frequencies.
Detecting the Source of Surface Plasmon Hot Electron Emission in Rectennas
Authors: Poushimin Rana , Antonio Braulio , Nunzi Jean-Michel
Published: July 2023

Using gold nanoparticles coated on ITO as a polarization-sensitive photodetector, we intend to locate the source of hot electron emission in rectenna. This plasmonic photodetector is polarisation sensitive and has the potential to achieve high efficiency across a wide range of frequencies.
High NA and Size Reduction in Prism Lens for Silicon Photonics SLG Beam Scanner
Authors: Kubota R. , Kamata M. , Tetsuya R. , Tamanuki T. , Baba T.
Published: July 2023

Specific prism lenses have been developed for Si photonics SLG beam scanner and solid-state FMCW LiDAR. This study enhanced the NA and reduced the size of this lens for more efficient and compact scanner device.