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SSRN 2024年

作者： Liu, Yin Wan, Jie Xiao, Yongbao Yu, Dechao College of Metallurgy and Materials Engineering Chongqing University of Science and Technology Chongqing401331 China Laboratory of Infrared Materials and Devices Advanced Technology Research Institute Ningbo University Ningbo315211 China State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques Institute of Optical Communication Materials South China University of Technology Guangzhou510641 China College of Materials Science and Engineering Chongqing University Chongqing400045 China Engineering Research Center of Optical Instrument and System Ministry of Education Shanghai Key Lab of Modern Optical System University of Shanghai for Science and Technology Shanghai200093 China

Glass forming regions of Al2O3-CaO-SrO (AlCaSr) system were systematically studied and clearly depicted by a combination of thermodynamic calculation method and traditional melt-quenching experiments. The glass forming region was first found with a composition range of Al2O3: 12-32 mol%, CaO: 43-68 mol%, and SrO: 20-36 mol%. Moreover, two representative glass compositions, 26.6Al2O3-49.4CaO-24SrO (AlCaSr-1) and 17.48Al2O3-58.52CaO-24SrO (AlCaSr-2), in central part of the experimental glass forming region and the corresponding glass doped with 1 mol% Er2O3, i.e., AlCaSr-1-Er and AlCaSr-2-Er, were selected and carefully prepared in our lab. Detailed investigations proved that the AlCaSr glasses had excellent comprehensive properties with high Tg temperature (~ 800 °C), wide transparency wavelength range (0.3-6 μm), and low maximum phonon energy (~ 770 cm-1), and good 2.7 μm mid-infrared emitting properties via doping Er3+ activators. These results highlight the potential application of AlCaSr glasses as infrared materials, and could benefit the development of high-performance infrared glasses. © 2024, The Authors. All rights reserved.

关键词： Aluminum oxide

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Hierarchical Micro/Nano Structures with Anti-Reflection and Superhydrophobicity on the Silicon Surface Fabricated by Femtosecond Laser

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SSRN 2024年

作者： Duan, Junyu Long, Gui Xu, Xu Liu, Weiming Li, Chuankun Zhang, Jianguo Xu, Jianfeng Xiao, Junfeng State Key Laboratory of Intelligent Manufacturing Equipment and Technology School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Hubei Jiuzhiyang Infrared System Co. Ltd. Wuhan430223 China Huazhong Institute of Electro-Optics Wuhan National Laboratory for Optoelectronics Wuhan430223 China China Ship Development and Design Center Wuhan43006 China Hunan University China

In this paper, hierarchical micro/nano structures composed of periodic microstructures, LIPSS, and nanoparticles were fabricated by femtosecond laser processing. A layer of hydrophobic species was formed on the micro/nano structures through perfluorosilane modification. The reflectivity and hydrophobicity’s influence mechanisms of structural height, duty cycle, and size are experimentally elucidated. The average reflectivity of the silicon surface in the visible light band is reduced to 3.0% under the optimal parameters, and the surface exhibits a large contact angle of 172.3 ± 0.8 ° and a low sliding angle of 4.2 ± 1.4 °. Finally, the durability of anti-reflection and superhydrophobicity is also confirmed. This study deepens the understanding of the principles of anti-reflection and superhydrophobicity and expands the design and preparation methods for self-cleaning and anti-reflective surfaces. © 2024, The Authors. All rights reserved.

关键词： Femtosecond lasers

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Evolution of Multiple Pulses and Pump Hysteresis Phenomenon in a Passively Mode-Locked Er-Doped Fiber Laser Based on an Sb2S3-PVA Saturable Absorber

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SSRN 2023年

作者： Hu, Qiongyu Yang, Kejian Li, Ming Li, Ping Zhao, Haoxu Zhang, Bin Liu, Jing Yang, Yongming Chen, Xiaohan Center for Optics Research and Engineering Key Laboratory of Laser & Infrared System Ministry of Education Shandong University Shandong Qingdao266237 China Institute of Novel Semiconductors State Key Laboratory of Crystal Materials Shandong University Jinan250100 China School of Information Science and Engineering Shandong Provincial Key Laboratory of Laser Technology and Application Shandong University Shandong Qingdao266237 China

The evolution of multiple pulses and the pump hysteresis phenomenon were observed in a passively mode-locked Er-doped fiber laser using an Sb2S3-PVA saturable absorber. As the pump power was increased, the generations of onefold, twofold, and threefold pulses were meticulously documented. When the pump power was decreased, the evolution of fivefold and sixfold pulses was carefully recorded, accompanied by a clear pump hysteresis phenomenon. A thorough analysis was conducted to examine and reveal the inversely proportional relationship between the RF spectrum modulation periods and the total pulse intervals of the multi-pulse bunches including from onefold to sixfold pulses. © 2023, The Authors. All rights reserved.

关键词： Hysteresis

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Dual-band high quality-factor perfect absorber based on uniaxial/biaxial anisotropic van der Waals polar crystals

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Results in Physics 2024年 61卷

作者： Song, Didi Wu, Biyuan Liu, Yufang Wu, Xiaohu Yu, Kun Henan Key Laboratory of Infrared Materials & Spectrum Measures and Applications School of Physics Henan Normal University Henan Xinxiang 453007 China Thermal Science Research Center Shandong Institute of Advanced Technology Shandong Jinan 250100 China

Phonon polaritons (PhPs) in two-dimensional van der Waals crystals, such as hexagonal boron nitride (hBN) and α-phase molybdenum trioxide (α-MoO3), exhibit remarkable spatial confinement and extremely low optical lo... 详细信息

Phonon polaritons (PhPs) in two-dimensional van der Waals crystals, such as hexagonal boron nitride (hBN) and α-phase molybdenum trioxide (α-MoO₃), exhibit remarkable spatial confinement and extremely low optical losses, offering possibilities for the development of novel micro and nanophotonic devices at mid-infrared wavelengths. Here, we demonstrate the potential of the proposed Tamm structure to achieve dual-band high quality-factor perfect absorption within the mid-infrared range. This structure utilizes upper and lower spacer layers to isolate the anisotropic materials hBN and α-MoO₃ from one-dimensional photonic crystals, where the Tamm phonon polaritons (TPhPs) are respectively excited at the interfaces, facilitating strong coupling with incident light and leading to significant dual-band perfect absorption phenomena. The results demonstrate that due to polariton resonances, the absorption peaks exhibit extremely narrow absorption bandwidths, with the maximum quality-factor reaching up to 297. In addition, tunable resonant wavelengths and polarization-dependent absorption properties are also demonstrated in the proposed Tamm structure. This study provides an alternative and straightforward approach for constructing dynamic and multifunctional optical devices such as optical modulators, tunable multi-band filters and biosensors. © 2024 The Authors

关键词： Dual-band absorber Hexagonal boron nitride Polarization-dependent Tamm phonon polaritons α-phase molybdenum trioxide

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Back-Scattering Suppression for Broad-Spectral High-Absorption Silicon Extended Area Blackbody

arXiv

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arXiv 2024年

作者： Zhou, Hong-Shuai Zhang, Jin-Hao Bai, Ben-Feng Mei, Xi-Ran Chen, Kun-Peng Hao, Xiao-Peng Song, Jian Guo, Guo-Rui Chen, Jia-Lin Tian, Tian Shen, Wan-Jie Zhong, Zi-Heng Liu, Jia-Yao Zhao, Ji-Hong Sun, Hong-Bo State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instrument Tsinghua University Beijing100084 China Shenzhen International Graduate School Tsinghua University Shenzhen518055 China Remote Sensing Calibration Laboratory National Institute of Metrology Beijing100029 China Technology Innovation Center of Infrared Remote Sensing Metrology Technology State Administration for Market Regulation Beijing100029 China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and Engineering Jilin University Changchun130012 China

The stability and emissivity of the online calibration blackbody used in high-precision infrared remote sensing detectors in extreme environments are the primary limiting factors for their measurement accuracy. Due to the limitations of microstructure size effects, traditional calibration extended area blackbody cannot achieve an optimal balance between emissivity and stability, thus hindering further improvement in infrared remote sensing accuracy. This work proposes a new method that utilize suppressing near-field backscattering to control far-field reflectance. Specifically, through simultaneously reducing backscattering intensity and the backscattering solid angle, the reflectance is significantly reduced to an extremely low limit, which is validated through numerical simulations. Additionally, by combining the femtosecond laser self-convergent processing technique, the spontaneous energy negative feedback mechanism during femtosecond laser processing is utilized to achieve the fabrication of a high emissivity, thermally stable, mechanically stable, and highly uniform extended area blackbody. The blackbody fabricated using this technique can be applied for online calibration in various extreme environments, significantly improving measurement accuracy and service life. © 2024, CC BY-NC-SA.

关键词： Reflection

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Coherent Microwave Emission of Gain-Driven Polaritons

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Physical Review Letters 2023年第14期130卷 146702-146702页

作者： Bimu Yao Y. S. Gui J. W. Rao Y. H. Zhang Wei Lu C.-M. Hu Department of Physics and Astronomy University of Manitoba Winnipeg R3T 2N2 Canada State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China

By developing a gain-embedded cavity magnonics platform, we create a gain-driven polariton (GDP) that is activated by an amplified electromagnetic field. Distinct effects of gain-driven light-matter interaction, such as polariton auto-oscillations, polariton phase singularity, self-selection of a polariton bright mode, and gain-induced magnon-photon synchronization, are theoretically studied and experimentally manifested. Utilizing the gain-sustained photon coherence of the GDP, we demonstrate polariton-based coherent microwave amplification (∼40 dB) and achieve high-quality coherent microwave emission (Q>109).

关键词： Coupled oscillators Magnetization dynamics Magnons Optical & microwave phenomena Polaritons Spintronics Synchronization

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Photonic slide rule with metasurfaces

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Light(science & Applications) 2022年第4期11卷 674-685页

作者： Feilong Yu Jin Chen Lujun Huang Zengyue Zhao Jiuxu Wang Rong Jin Jian Chen Jian Wang Andrey E.Miroshnichenko Tianxin Li Guanhai Li Xiaoshuang Chen Wei Lu State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of Sciences500 Yu Tian Road200083 ShanghaiChina. Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesNo.1 Subl ane Xiangshan310024 HangzhouChina SShanghai Research Center for Quantum Sciences 99 Xiupu Road201315 ShanghaiChina University of Chinese Academy of Science No.19 Yuquan Road100049 BejingChina. School of Engineering and Information Technology University of New South WalesCanberra 2602Australia

As an elementary particle,a photon that carries information in frequency,polarization,phase,and amplitude,plays a crucial role in modern science and ***,how to retrieve the full information of unknown photons *** ultracompact manner over broad bandwidth remains a challenging task with growing ***,we demonstrate a versatile photonic slide rule based on an ll-silicon metasurface that enables uS to reconstruct incident photons'frequency and polarization *** underlying mechanism relies on the coherent interactions of frequency-driven phase diagrams which rotate at various angular velocities within broad *** rotation direction and speed are determined by the topological charge and phase ***,our metasurface leverages both achromatically focusing and azimuthally evolving phases with topological charges+1 and-1 to ensure the confocal annular intensity *** combination of geometric phase and interference holography allows the joint manipulations of two distinct group delay coverages to realize angle-resolved in-pair spots in *** manner-a behavior that would disperse along longitudinal direction in conventional *** spin-orbital coupling between the incident photons and vortex phases provides routing for the simultaneous identifcation of the photons'frequency and circular polarization state through recognizing the spots'*** work provides an analog of the conventional slide rule to flexibly characterize the photons in an ultracompact and multifunctional way and may find applications in integrated optical circuits or pocketable devices.

关键词： rule topological elementary

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High-Parameters Experimental Linear Plasma Device For Fusion Wall-Conditioning Studies

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SSRN 2023年

作者： Wang, Junru Yu, Yaowei Zuo, Guizhong Cao, Bin Chen, Zongsheng Shi, Jiaming Fan, Bin Hu, Jiansheng Anhui Provincial Laboratory of Advanced Laser Technology State Key Laboratory of Pulsed Power Laser Technology College of Electronic Engineering National University of Defense Technology Hefei230037 China Key Laboratory of Infrared Low Temperature Plasma of Anhui Province College of Electronic Engineering National University of Defense Technology Hefei230037 China Institute of Plasma Physics Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei230031 China

The tungsten impurity caused by sputtering of the first wall is an issue influencing the plasma wall interaction (PWI) research of EAST, ITER and other future fusion devices. The linear plasma device (LPD) serves as an effective divertor simulator for developing the wall conditioning of W impurity control from the source. This work presents the design and construction of High-parameters Experimental Linear Plasma Device (HELPD) in detail, including its layout and operation parameters. The preliminary results show that the device could produce a steady state plasma of incident ion energy of 1~10 eV and the flux of 1022 m-2s-1, with 10 kW helicon wave. And the target sample could be exchanged in a separate material pretreatment vessel for wall conditioning, such as lithium coating and glow discharge cleaning (GDC) without breaking vacuum conditions. The divertor plasma environment is properly simulated. HELPD would provide valuable platform for PWI evolution experiments towards future longer pulse high performance H-mode operation. © 2023, The Authors. All rights reserved.

关键词： Glow discharges

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Composition-Dependent Optical, Dielectric and D-Orbital Electron Characteristic of High-Throughput Horizontal Composition Gradient Li1-Xmgxti2o4 Combinatorial Film

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SSRN 2024年

作者： Wang, Yueming Li, Yongfu Wei, Mingyang Jin, Kui Li, Qian Zhang, Ding Zhou, Xiang'an Han, Yating Lian, Jie School of Information Science and Engineering Shandong Provincial Key Laboratory of Laser Technology and Application Shandong University Qingdao266237 China Center for Optics Research and Engineering Key Laboratory of Laser & Infrared System Ministry of Education Shandong University Qingdao266237 China National Lab for Superconductivity Institute of Physics Chinese Academy of Sciences Beijing100190 China State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing100084 China

The unique physical properties of LiTi2O4 and MgTi2O4 have attracted extensive research interest in various fields, including new type batteries and high-temperature superconductors. However, the intricate mechanism governing the d-orbital electron within this system still awaits further excavation. Herein, we employed the combinatorial laser molecular beam epitaxy technique to fabricate a high-quality composition-spread Li1-xMgxTi2O4 film and evaluated its structure, composition, surface morphology and phonon modes by X-ray diffraction, X-ray photoelectron spectroscopy, atomic force microscopy, and Raman scattering spectroscopy. The optical constants and dielectric properties of diverse microregions with varying Li/Mg content over a wide spectral range (189-1658 nm) were measured nondestructively using the ellipsometer, revealing the composition-dependent optical properties of Li1-xMgxTi2O4. By fitting the second derivative spectra (d2Ε/dE2) using the standard critical point model, five transitions within the detected spectral range were observed. Combining previous analyses and first-principles calculation, we attribute the critical points to crystal field (CF) transition 4A2 →4T1 originating from the spin state of tetrahedral Li/Mg ions, the binding of Ti-related pairs and electron transitions between O-2p to Ti-3d orbits. This exploration of the precise structure of the d-metal band provides a positive reference for the regulation and application of relevant devices. © 2024, The Authors. All rights reserved.

关键词： Lithium compounds

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Rethinking Generalizable infrared Small Target Detection: A Real-scene Benchmark and Cross-view Representation Learning

arXiv

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arXiv 2025年

作者： Lu, Yahao Li, Yuehui Guo, Xingyuan Yuan, Shuai Shi, Yukai Lin, Liang School of Information Engineering Guangdong University of Technology Guangzhou510006 China Southern Power Grid Ltd. Guangzhou510000 China Xi’an Key Laboratory of Infrared Technology and System School of Optoelectronic Engineering Xidian University Xi’an710071 China School of Data and Computer Science Sun Yat-sen University Guangzhou510006 China

infrared small target detection (ISTD) is highly sensitive to sensor type, observation conditions, and the intrinsic properties of the target. These factors can introduce substantial variations in the distribution of acquired infrared image data, a phenomenon known as domain shift. Such distribution discrepancies significantly hinder the generalization capability of ISTD models across diverse scenarios. To tackle this challenge, this paper introduces an ISTD framework enhanced by domain adaptation. To alleviate distribution shift between datasets and achieve cross-sample alignment, we introduce Cross-view Channel Alignment (CCA). Additionally, we propose the Cross-view Top-K Fusion strategy, which integrates target information with diverse background features, enhancing the model’s ability to extract critical data characteristics. To further mitigate the impact of noise on ISTD, we develop a Noise-guided Representation learning strategy. This approach enables the model to learn more noise-resistant feature representations, to improve its generalization capability across diverse noisy domains. Finally, we develope a dedicated infrared small target dataset, RealScene-ISTD. Compared to state-of-the-art methods, our approach demonstrates superior performance in terms of detection probability (Pd), false alarm rate (Fa), and intersection over union (IoU). The code is available at: https://***/luy0222/RealScene-ISTD. © 2025, CC BY.

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