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Liquid crystal variable retarder with microchannels for high-power continuous laser application

Journal of Molecular Liquids 2025年 419卷

作者： Wang, Jundong Zhao, Yuan-an Tao, Chunxian Wang, Jianguo Chen, Yi Wang, Fajia Zhao, Yadi Liu, Xiaofeng Hong, Ruijin Zhang, Dawei Shao, Jianda School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai200093 China Laboratory of Thin Film Optics Shanghai Institute of Optics and Fine Mechanics No.390 Qinghe Road Jiading District Shanghai201800 China Key Laboratory of Materials for High Power Laser Chinese Academy of Sciences Shanghai201800 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China Center for Excellence in Ultra-Intense Laser Science Chinese Academy of Sciences Shanghai201800 China

A liquid crystal variable retarder (LCVR) experiences significant thermal effects when exposed to high-power continuous-wave lasers, leading to the degradation of its phase delay. When the temperature surpasses the clear point temperature of the liquid crystal material, the device loses its phase delay performance. To address this issue, we designed an LCVR based on microchannel water cooling and heat dissipation. A microchannel fabricated within the substrate of the LCVR in an annular shape can transmit a large-aperture beam. We evaluated the phase delay degradation under continuous-wave laser loading with a spot diameter of 15 mm (1/e2 diameter) at a wavelength of 1070 nm, as well as the phase delay variation under voltage control. By integrating simulation models, we determined the usable area of the microchannel LCVR where the phase distortion on the device is less than λ/50 under continuous-wave laser irradiation at varying power densities. Our results indicate that the microchannel LCVR can maintain a usable area with a diameter of 4.8 mm under continuous-wave laser irradiation at 46 W/cm2. Furthermore, the microchannel LCVR can still achieve a phase delay of 90° by setting the voltage to 7.2 V. The maximum power density tolerated by the LCVR without a microchannel is 22 W/cm2, which is 40 W/cm2 lower than that of the microchannel LCVR. As long as the power density of the irradiation does not exceed 62 W/cm2, the microchannel LCVR can be used in high-power laser systems. © 2024 Elsevier B.V.

关键词： Irradiation

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Photovoltaic induced self-powered gas sensor based on 2D MoS2 incorporated NbSe2 nanorods heterostructure for NH3 gas sensing at room temperature

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Chemical engineering Journal 2024年 491卷

作者： Saravanan, Adhimoorthy Huang, Bohr-Ran Hwang, Seung-Kyu Kathiravan, Deepa Wei-Wen Hsiao, Wesley Jayachitra, Ravichandran Abun, Abebaw Hong, Po-Da Mohammadi, Ali Vilian, A.T. Ezhil Han, Young-Kyu Suk Huh, Yun Graduate Institute of Electro-Optical Engineering and Department of Electronic and Computer Engineering National Taiwan University of Science and Technology Taipei106 Taiwan Department of Materials Science and Engineering National Taiwan University of Science and Technology 43 Keelung road Section 4 Taipei10607 Taiwan Department of Chemical Engineering National Taiwan University of Science and Technology Taipei10607 Taiwan Department of Biological Sciences and Bioengineering Nano Bio High-Tech Materials Research Center Inha University Incheon22212 Korea Republic of Department of Energy and Materials Engineering Dongguk University-Seoul Seoul100-715 Korea Republic of

Two-dimensional (2D) transition metal dichalcogenides (TMDs) have attracted significant attention for their optical and gas-sensing applications due to their exceptional sensitivity. Reliable selectivity and low power consumption are two major requirements for photodetector and gas sensor applications in next-generation electronic devices and the Internet of Things. Self-powered sensors (especially photovoltaic gas sensors) can solve these problems. In this study, for the first time, we report 2D TMDs (NbSe2-MoS2 hybrid) on a SiO2/Si substrate to fabricate photovoltaic self-powered gas sensors. The gas sensors are operated by the photovoltaic effect of the NbSe2-MoS2 nanostructure, which is prepared using the liquid phase exfoliation process. Initially, it was revealed that the present hybrid material exhibits photovoltaic properties under light illumination, with a circuit current of 0.25 µA and a circuit voltage of 34 mV. The NbSe2-MoS2 nanostructure characteristics were then used for NH3 gas sensing at different concentrations, and the gas sensing response was detected from low (8.8 % at 10 ppm) to high (28.8 % at 500 ppm) concentrations. The built-in electric field occurred between the NbSe2-MoS2 junction and eventually operated as a driving force for NbSe2-MoS2 gas sensing without an external bias voltage. The physisorption of gas molecules on their surface prompts a charge-transfer mechanism that improves the gas sensor response. The combined outcome of NbSe2-MoS2 heterostructures could pave way to next-generation gas sensing device fabrications. © 2024 Elsevier B.V.

关键词： Molybdenum compounds

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Photovoltaic Induced Self-Powered Gas Sensor Based on 2d Mos2 Incorporated Nbse2 Nanorods Heterostructure for Nh3 Gas Sensing at Room Temperature

SSRN

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SSRN 2024年

作者： Saravanan, Adhimoorthy Huang, Bohr-Ran Hwang, Seung-Kyu Kathiravan, Deepa Hsiao, Wesley Wei-Wen Ravichandran, Chitra Abun, Abebaw Hong, Po-Da Mohammadi, Ali Vilian, Ezhil Han, Young-Kyu Huh, Yun Suk Graduate Institute of Electro-Optical Engineering Department of Electronic and Computer Engineering National Taiwan University of Science and Technology Taipei106 Taiwan Department of Materials Science and Engineering National Taiwan University of Science and Technology 43 Keelung road Section 4 Taipei10607 Taiwan Department of Chemical Engineering National Taiwan University of Science and Technology Taipei10607 Taiwan Department of Biological Sciences and Bioengineering Nano Bio High-Tech Materials Research Center Inha University Incheon22212 Korea Republic of Department of Energy and Materials Engineering Dongguk University-Seoul Seoul100-715 Korea Republic of

Two-dimensional (2D) transition metal dichalcogenides (TMDs) have attracted significant attention for their optical and gas-sensing applications due to their exceptional sensitivity. Reliable selectivity and low power consumption are two major requirements for photodetector and gas sensor applications in next-generation electronic devices and the Internet of Things. Self-powered sensors (especially photovoltaic gas sensors) can solve these problems. In this study, for the first time, we propose 2D TMDs (NbSe2-MoS2 hybrid) on a SiO2/Si substrate to fabricate photovoltaic self-powered gas sensors. The gas sensors are operated by the photovoltaic effect of the NbSe2-MoS2 nanostructure, which is prepared using the liquid phase exfoliation process. Initially, it was revealed that the present hybrid material exhibits photovoltaic properties under light illumination, with a circuit current of 0.25 µA and a circuit voltage of 34 mV. The NbSe2-MoS2 nanostructure characteristics were then used for NH3 gas sensing at different concentrations, and the gas sensing response was detected from low (8.8% at 10 ppm) to high (28.8% at 500 ppm) concentrations. The built-in electric field occurred between the NbSe2-MoS2 junction and eventually operated as a driving force for NbSe2-MoS2 gas sensing without an external bias voltage. The physisorption of gas molecules on their surface prompts a charge-transfer mechanism that improves the gas sensor response. The combined outcome of NbSe2-MoS2 heterostructures could pave way to next-generation gas sensing device fabrications. © 2024, The Authors. All rights reserved.

关键词： Molybdenum compounds

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Design and Realization of Octave-Spanning, Low fceo Microcombs at Sub-Telecom Wavelengths in Silicon Nitride

Design and Realization of Octave-Spanning, Low fceo Microcom...

引用

Conference on Lasers and Electro-Optics (CLEO)

作者： Gabriel Colación Lala Rukh Tristan Melton Alwaleed Aldhafeeri Hsiao-Hsuan Chin Chee Wei Wong Tara Drake Optical Science & Engineering Center for High Technology Materials University of New Mexico Albuquerque NM USA Mesoscopic Optics and Quantum Electronics Laboratory University of California Los Angeles CA USA Deptartment of Physics and Astronomy University of New Mexico Albuquerque NM USA

We present design and experimental characterization of microcombs with octave bandwidth, harmonic dispersive waves, and low carrier-envelope-offset frequency $(\mathrm{f}_{\text{ceo}})$ for f-2f self-referencing. Th... 详细信息

ISBN: (纸本)9798350369311

关键词： Silicon nitride Bandwidth Lasers and electrooptics Harmonic analysis Laser tuning Electro-optical waveguides Dispersion

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Classifying Vibration Modes Generated by The Michelson Interferometer Using Machine Learning Methods

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Journal of Modern Physics 2024年第12期15卷 2169-2192页

作者： Xin-Han Tsai Anthony An-Chih Yeh Chen-Hsin Lu Shang-Yu Chou Shih-Wei Wang Chi-Wei Lee Po-Han Lee The Affiliated Senior High School of National Taiwan Normal University Taipei City Department of Materials Science and Engineering National Tsing Hua University Hsinchu City The Department of Dentistry National Defense Medical Center Taipei City Mechanical Science & Engineering Department University of Illinois at Urbana-Champaign Urbana US Department of Physics National Tsing Hua University Hsinchu City Department of Electro-Optical Engineering National Taipei University of Technology Taipei City

In this paper, we explore the classification of vibration modes generated by handwriting on an optical desk using deep learning architectures. Three deep learning models—Long Short-Term Memory (LSTM) networks with attention mechanism, Video Vision Transformer (ViViT), and Long-term Recurrent Convolutional Network (LRCN)—were evaluated to determine the most effective method for analyzing time series patterns generated by a Michelson interferometer. The interferometer was used to detect vibration modes created by handwriting, capturing time-series data from the diffraction patterns. Among these models, the LSTM-Attention network achieved the highest validation accuracy, reaching up to 92%, outperforming both ViViT and LRCN. These findings highlight the potential of deep learning in material science for detecting and classifying vibration patterns. The powerful performance of the LSTM-Attention model suggests that it could be applied to similar classification tasks in related fields.

关键词： Michelson Interferometer Machine Learning Vibration Modes Long Short-Term Memory (LSTM)

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Phase equilibria and thermodynamics assessment of the Co–Fe–Nb ternary system

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Intermetallics 2024年 168卷

作者： Hutabalian, Yohanes Hermana, Gita Novian Laksono, Andromeda Dwi Chen, Sinn-wen Department of Chemical Engineering National Tsing Hua University Taiwan Hsinchu30013 Taiwan Research and Development Center PT. Gotion Indonesia Materials Jakarta12950 Indonesia Department of Advanced Materials Engineering Bandung Polytechnic for Manufacturing West Java Bandung40135 Indonesia Department of Materials Science and Engineering National Taiwan University of Science and Technology Taiwan Taipei10672 Taiwan Study Program of Materials and Metallurgical Engineering Institut Teknologi Kalimantan Soekarno-Hatta Street Km. 15 Karang Joang East Kalimantan Balikpapan76127 Indonesia High Entropy Materials Center National Tsing Hua University Taiwan Hsinchu30013 Taiwan

The Co–Fe–Nb materials system is a crucial material for magnetic applications. Despite its importance, the phase equilibria and thermodynamic characteristics of this ternary system have not been explored in detail. This study employs the Calphad method to model the phase equilibria of the Co–Fe–Nb ternary system. To obtain the ternary interaction parameters, the experimental data on the isothermal sections at temperatures ranging from 700 °C to 1300 °C was evaluated. These findings indicate that the Co–Fe–Nb system contains no ternary compound, and the (Co,Fe)7Nb6 phase exists as a single solid solution. Significant solubility of the third element in the binary compounds of Co2Nb (Laves C14) and Fe2Nb (Laves C15) is also observed. The results are in good agreement with the experimental data. Furthermore, a liquidus projection of the system is presented, for the first time, revealing eight primary solidification phases in the Co–Fe–Nb ternary system. © 2024

关键词： Phase equilibria

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Giant 2D Skyrmion Topological Hall Effect with Ultrawide Temperature Window and Low-Current Manipulation in 2D Room-Temperature Ferromagnetic Crystals

arXiv

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arXiv 2023年

作者： Zhang, Gaojie Luo, Qingyuan Wen, Xiaokun Wu, Hao Yang, Li Jin, Wen Li, Luji Zhang, Jia Zhang, Wenfeng Shu, Haibo Chang, Haixin State Key Laboratory of Material Processing and Die & Mold Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Wuhan National High Magnetic Field Center Institute for Quantum Science and Engineering Huazhong University of Science and Technology Wuhan430074 China College of Optical and Electronic Technology China Jiliang University Hangzhou310018 China School of Physics Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan430074 China Shenzhen R&D Center of Huazhong University of Science and Technology Shenzhen518000 China

The discovery and manipulation of topological Hall effect (THE), an abnormal magnetoelectric response mostly related to the Dzyaloshinskii-Moriya interaction (DMI), are promising for next-generation spintronic devices based on topological spin textures such as magnetic skyrmions. However, most skyrmions and THE are stabilized in a narrow temperature window either below or over room temperature with high critical current manipulation. It is still elusive and challenging to achieve large THE with both wide temperature window till room temperature and low critical current manipulation. Here, by using controllable, naturally-oxidized, sub-20 and sub-10 nm 2D van der Waals room-temperature ferromagnetic Fe3GaTe2-x crystals, robust 2D THE with ultrawide temperature window ranging in three orders of magnitude from 2 to 300 K is reported, combining with giant THE of ~5.4 μΩ·cm at 10 K and ~0.15 μΩ·cm at 300 K which is 1-3 orders of magnitude larger than that of all known room-temperature 2D skyrmion systems. Moreover, room-temperature current-controlled THE is also realized with a low critical current density of ~6.2×105 A·cm-2. First-principles calculations unveil natural oxidation-induced highly-enhanced 2D interfacial DMI reasonable for robust giant THE. This work paves the way to room-temperature, electrically-controlled 2D THE-based practical spintronic devices. © 2023, CC BY-NC-ND.

关键词： Room temperature

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Design and Characterization of high-Q Micro-Ring Resonator using X-Cut LNOI

Design and Characterization of High-Q Micro-Ring Resonator u...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Ravi Kiran Chityala Arjun Aryal Scott Madras Michael Gehl Aleem Siddiqui Tito Busani Center for High Technology Materials (CHTM) University of New Mexico Albuquerque NM USA Electrical and Computer Engineering (ECE) University of New Mexico Albuquerque NM USA Optical Science and Engineering (OSE) University of New Mexico Albuquerque NM USA Sandia National Laboratories Albuquerque NM USA

We present the optimum fabrication/design of 200nm thick X-cut Lithium Niobate on an Insulator (LNOI) micro-ring resonator where we report Q-factors in excess of 75,000, the highest reported to date in this material s... 详细信息

ISBN: (纸本)9781957171258

关键词： Extinction ratios Lithium niobate optical resonators Q factor Ring resonators Tunable lasers

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Mn2+-Si4+ Co-Doped Al2o3- CE: (Y, Tb) Ag Composite Ceramic Phosphors for high Color Rendering White Led/Ld Illumination: An Investigation on the Luminescence Properties and Energy Transfer Mechanism

SSRN

引用

SSRN 2024年

作者： Jiang, Renjie Chen, Jie Li, Mingqin Tian, Yanna Shen, Shiji Yang, Xuan Tang, Yanru Sun, Yan Lin, Hui Zhou, Shengming Key Laboratory of Materials for High-Power Laser Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Shanghai Tech University Shanghai201210 China Engineering Research Center of Optical Instrument and System University of Shanghai for Science and Technology Shanghai200093 China Zhejiang Lab Hangzhou311121 China

Ce: YAG- Al2O3 composite ceramics are regarded as highly promising materials for laser illumination application due to their high luminous efficacy and thermal stability. Nevertheless, pure YAG-based ceramics exhibit limited color rendering index (CRI) for indoor lighting due to their low red emission component. In this study, we synthesized high-performance Ce, Mn-doped (Y, Tb)3Al5O12-Al2O3 composite ceramic phosphors via a solid-state reaction method. It was observed that the introduction of Mn2+ ions created a secondary luminescence center with an emission peak centered at 580 nm. As the Mn2+ concentration increased, the emission peak redshifted from 580 nm to 591 nm, leading to a significant enhancement in the color rendering index of the ceramics. The cross-energy transfer between Tb3+ and Mn2+, Ce3+ ions augmented the absorption and conversion of blue light by the ceramics, thereby reducing the correlated color temperature greatly. Based on these findings, ceramics with a Ce3+ concentration of 3 at% and a Mn2+ concentration of 4 at% exhibited the highest CRI values (81.3 and 75.6) under both laser excitation and LED excitation, establishing them as strong candidates for achieving high color rendering in white LED/LD illumination applications. © 2024, The Authors. All rights reserved.

关键词： Energy transfer

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Graphene calorimetric single-photon detector

arXiv

引用

arXiv 2024年

作者： Huang, Bevin Arnault, Ethan G. Jung, Woochan Fried, Caleb Russell, B. Jordan Watanabe, Kenji Taniguchi, Takashi Henriksen, Erik A. Englund, Dirk Lee, Gil-Ho Fong, Kin Chung Intelligence Community Postdoctoral Research Fellowship Program Massachusetts Institute of Technology CambridgeMA02139 United States Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology CambridgeMA02139 United States Department of Physics Pohang University of Science and Technology Pohang790-784 Korea Republic of Department of Physics Washington University in St. Louis St. LouisMO United States Research Center for Electronic and Optical Materials National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan Research Center for Materials Nanoarchitectonics National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan RTX BBN Technologies Quantum Engineering and Computing Group CambridgeMA02138 United States

Single photon detectors (SPDs) [1, 2] are essential technology in quantum science, quantum network, biology, and advanced imaging [3-5]. To detect the small quantum of energy carried in a photon, conventional SPDs rely on energy excitation across either a semiconductor bandgap or superconducting gap. While the energy gap suppresses the false-positive error, it also sets an energy scale that can limit the detection efficiency of lower energy photons and spectral bandwidth of the SPD [6-8]. Here, we demonstrate an orthogonal approach to detect single near-infrared photons using graphene calorimeters [9-13]. By exploiting the extremely low heat capacity of the pseudo-relativistic electrons in graphene near its charge neutrality point [14], we observe an electron temperature rise up to ∼2 K using a hybrid Josephson junction. In this proof-of-principle experiment, we achieve an intrinsic quantum efficiency of 87% (75%) with dark count © 2024, CC BY.

关键词： Particle beams

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