2021
2021
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Record 253 of
Title:Thermal Analysis of Visible Emission from Micro-Ring Resonators by Third-Harmonic Generation
Author(s):Wang, Shao Hao(1); Li, Yuhua(2); Wang, Leiran(3); Little, Brent E.(3); Chu, Sai Tak(4)Source: IEEE Photonics Technology Letters Volume: 33 Issue: 5 DOI: 10.1109/LPT.2021.3054379 Published: March 1, 2021Abstract:We present a thermal model to describe the interaction between the visible modes in micro-ring resonators from the third harmonic generation (THG) nonlinear process. We demonstrate that the model can predict the thermal characteristics of the orthogonal THG modes from the interaction and of the resonance coupling between them in micro-ring resonators having a strong nonlinear thermo-optic coefficient. Furthermore, the model can be used to extract the THG efficiency, the linear and nonlinear thermo-optic coefficients and the polarization dependency of the THG modes from the measurement data. ? 1989-2012 IEEE.Accession Number: 20210709904693 -
Record 254 of
Title:Optical design of a snapshot image mapping spectrometer
Author(s):Ding, Xiaoming(1,2); Yan, Qiangqiang(2); Hu, Liang(3); Zhou, Shubo(4); Wang, Xiaocheng(1); Li, Yupeng(1)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 12064 Issue: DOI: 10.1117/12.2606321 Published: 2021Abstract:This paper introduces the optical design method of an IMS prototype and proposes an entire optical system optimization approach. The final performance evaluation reveals that the optimized system could meet the requirements. The spectral range of the prototype is designed to be from 450 nm to 700 nm, containing 31 bands. The spectral resolution at the central wavelength is about 8 nm. The field angle (2ω) is 1.86 deg, and the spatial angle resolution (Δω) is designed to be 0.013 deg. Copyright ? 2021 SPIE.Accession Number: 20220211450474 -
Record 255 of
Title:Non-interferometric accurate phase imaging via linear-convergence iterative optimization
Author(s):Huang, Jianhui(1,2); Pan, An(3); Jin, Huiliang(1); Meng, Guoxiang(1); Ye, Qian(1,4)Source: Optics and Lasers in Engineering Volume: 144 Issue: DOI: 10.1016/j.optlaseng.2021.106630 Published: September 2021Abstract:This paper reported a general non-interferometric high-accuracy quantitative phase imaging (QPI) method for arbitrary complex-valued objects. Given by a typical 4-f optical configuration as the imaging system, three frames of small-window phase modulation are applied on the object's Fourier spectrum so that redistributed intensity patterns are produced on the image plane, in which the object phase emerges at different degree. Then, an algebraic relationship that connects the object phase with the output intensity is established to provide us with an approximate closed-form phase recovery. Further, an efficient iterative optimization strategy is developed to turn that approximate solution into an accurate one. Due to the linear convergence property of the iteration, a high-accuracy phase recovery is achieved without requiring heavy iterations. The feasibility and accuracy of the proposed method are verified by both numerical simulations and experiments on diverse phase objects including biomedical tissues. ? 2021Accession Number: 20211610236399 -
Record 256 of
Title:Chirality-Assisted Aharonov-Anandan Geometric-Phase Metasurfaces for Spin-Decoupled Phase Modulation
Author(s):Ji, Ruonan(1); Xie, Xin(1); Guo, Xuyue(1); Zhao, Yang(1); Jin, Chuan(2); Song, Kun(1); Wang, Shaowei(3); Yin, Jianbo(1); Liu, Yahong(1); Jiang, Chengming(4); Yang, Chaoshun(1); Zhao, Xiaopeng(1); Lu, Wei(3)Source: ACS Photonics Volume: 8 Issue: 6 DOI: 10.1021/acsphotonics.1c00505 Published: June 16, 2021Abstract:In this work, a quasi-nondispersive and spin-decoupled phase modulation strategy was proposed based on the chiral structure. Owing to the spin-dependent response of the chiral structure, the evolution of the Aharonov-Anandan (AA) geometric phase can be controlled by tuning different structural parameters independently. Additionally, the chiral structure was designed nonresonant or weak-resonant to minimize the influence of strong resonant absorption and large dispersive propagation phase shift, leading to an efficiently quasi-nondispersive phase modulation. To prove the validity of the strategy, a series of umbrella-shaped reflection-Type metal-insulator-metal structures were designed as the unit cells and simulated with the finite element method. Moreover, the metasurfaces were designed based on such unit cells to generate broadband orbital angular momentums with different topological charges and spin-switchable holograms, respectively. Simulated and experimental results are in good agreement with the theoretical results. To the best of our knowledge, broadband spin-dependent phase modulation has been achieved without intentionally merging other types of phases for the first time in this work. We believe that this strategy provides a flexible approach for complex spin-or polarization-related applications in optical communication, integrated optics, optical sensing, and other related fields. ?Accession Number: 20212510541323 -
Record 257 of
Title:Numerical simulation of dielectric barrier discharge with asymmetrical electrode in atmospheric helium
Author(s):Wang, Jing(1,2); Li, Jing(1,2); Lei, Bingying(1,2); Ran, Shuang(1,2); Xu, Boping(1,2); Liu, Yinghua(1,2); Li, Xinzhong(3); Wang, Yishan(1,2); Tang, Jie(1,2); Zhao, Wei(1,2); Duan, Yixiang(4)Source: Plasma Sources Science and Technology Volume: 30 Issue: 3 DOI: 10.1088/1361-6595/abe613 Published: March 2021Abstract:The characteristics of the dielectric barrier discharge (DBD) equipped with asymmetrical electrode (ring electrode on the upper and disk electrode on the lower) in atmospheric helium are investigated by a two-dimensional self-consistent fluid model. Simulation results show that as the applied voltage increases, the discharge enhances and the onset of discharge advances, which is similar to the results of traditional DBD. However, with the applied voltage increasing, the symmetry of the discharge current pulses in the positive and negative half cycles disappears because of the asymmetric electrode configuration. In addition, only the spatial distribution of the electron density at the peak moments of the first and second current pulses satisfies the complementary characteristics, while the spatial distribution at other peak moments does not meet the complementary characteristics. Moreover, the electric field, near the upper dielectric barrier surface, presents a curtain-like distribution with considerable radial electric field components, which results from the non-uniform radial surface charge distribution and the ring electrode configuration. The relative variation of the radial distribution of surface charge density is largely determined by the geometry of the opposite electrode. ? 2021 IOP Publishing Ltd.Accession Number: 20211410165684 -
Record 258 of
Title:High-stability three-field TV detection system
Author(s):Peng, Jian-Wei(1); Ma, Ying-Jun(1); Chen, Wei-Ning(1); Shi, Kui(1); Zhang, Gao-Peng(1)Source: Guangxue Jingmi Gongcheng/Optics and Precision Engineering Volume: 29 Issue: 7 DOI: 10.37188/OPE.20212907.1559 Published: July 2021Abstract:To meet the strict requirements of stability and consistency of the optical axis for the current three-field TV detection system with a photoelectric search and tracking device, a three-field TV detection system with a rotary switching mechanism was studied. Through the analysis of the system indicators, an optical system for cut-in and cut-out field of view switching was selected, and the structure of the rotary switching mechanism was presented. Based on this, a precise rotating shafting, position-limit mechanism with a powerful neodymium magnet and a high elastic plunger, and worm drive mechanism with self-locking characteristics were designed. The selection process and results of the limit mechanism and the drive mechanism were given. A method of optical axis consistency adjustment with theodolite and cross-reticle was proposed. With this design and adjustment process, a high-stability three-field TV detection system was realized. The test results show that the stability of the optical axis of the M-FOV is less than 8", and the consistency of the optical axis of the three fields of view is within 1 pixel size, which meets the indicator requirements. The results of laboratory and outdoor experiments show that the imaging quality of each field of view of the system is excellent, and the detection range is long, which can meet the requirements of use. ? 2021, Science Press. All right reserved.Accession Number: 20213310779846 -
Record 259 of
Title:Writing nanopores on a ZnS crystal with ultrafast Bessel beams
Author(s):Chang, Gai-Yan(1,2); Wang, Yu-Heng(3); Cheng, Guang-Hua(4)Source: Chinese Optics Volume: 14 Issue: 1 DOI: 10.37188/CO.2020-0101 Published: January 2021Abstract:Zinc sulfide (ZnS) crystal is one of the important materials used to make the wide-spectrum infrared window. The ultrafast laser technology for manufacturing the nanopores with high aspect ratio provides an important approach to fabricate the photonic devices such as mid-infrared waveguide Fourier transform spectrometer etc. In this paper, a 40-times-demagnification ultrafast laser direct-writing system was built with a 4f system and a Gaussian-Bessel beam generated by a quartz axicon and a Yb:KGW laser source that operated at a wavelength of 1030 nm, a repetition rate of 100 kHz and a pulse width tunable from 223 fs to 20 ps. When the pulse energy was changed from 36 μJ to 63 μJ and the pulse duration was changed from 12.5 ps to 20 ps, the nanopore structure with a diameter of 80~320 nm was successfully written on the ZnS crystal. The surface morphology, diameter and depth of the nanopores were determined by FIB (Focused Ion Beams) ablation and SEM (Scanning Electron Microscopy) imaging. The influence of laser pulse energy and pulse width on the nanopores was studied. The results show that when the pulse width is 20 ps and the pulse energy is 48 μJ, the depth of a nanopore is about 270 μm. Copyright ?2021 Chinese Optics. All rights reserved.Accession Number: 20210609886711 -
Record 260 of
Title:Thermochromic Film Based on VO2@SiO2 Core-shell Nanoparticles
Author(s):Wang, Xin(1); Hu, Wenjie(1); Xu, Yao(1)Source: Guangzi Xuebao/Acta Photonica Sinica Volume: 50 Issue: 7 DOI: 10.3788/gzxb20215007.0731001 Published: July 25, 2021Abstract:A thermochromic film was prepared with VO2@SiO2 core-shell nanoparticles to enhance the visible light transmittance and weather resistance of thermochromic film and also decrease the agglomeration of VO2 nanoparticles prepared by thermal decomposition method. VO(OH)2@SiO2 core-shell nanoparticles were prepared by coating SiO2 layer on the surface of VO(OH)2 nanoparticles via the surface electric interaction between nagatively charged VO(OH)2 nanoparticles and positively charged NH2 groups of aminopropyltriethoxylsilane. Then a normal heat treatment of VO(OH)2@SiO2 under Ar atmosphere was utilized to obtain VO2@SiO2 nanoparticles. Subsequently optical film with good thermochromic property was prepared by coating the resin dispersion of VO2@SiO2 on well cleaned glass. The thermochromic property and the weather resistance of thermochromic film were studied. From TEM images, we find that SiO2 shell prevents the agglomeration of VO(OH)2 during heat treatment. Research on the optical properties of the film shows that the SiO2 and air of low refractive index can improve the optical properties of thermochromic films, and when the mass fraction of VO2@SiO2 nanoparticles is 10wt%, the optical performance of the composite film is the best. The protective effect of the SiO2 shell to the VO2 core obviously improves the oxidation resistance and corrosion resistance of VO2 in damp heating and acidic environment, which makes longer life of VO2 thermochromic film. ? 2021, Science Press. All right reserved.Accession Number: 20213110707199 -
Record 261 of
Title:Design of wide view aerial camera system in low-light
Author(s):Peng, Jianwei(1); Chen, Weining(1); Zhang, Gaopeng(1); Fang, Yao(1); Dong, Sen(1); Yang, Hongtao(1)Source: Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering Volume: 50 Issue: 12 DOI: 10.3788/IRLA20210312 Published: December 25, 2021Abstract:In order to meet the requirements of quick acquisition of aerial image information in low light condition, a wide view imaging system which can be adapted to low-light environments was studied. Based on the camera working mode of frame-sweep imaging, the technology route of adopting a large relative aperture and low distortion optical system, combining a low-noise and high-sensitivity CMOS detector with vacuum cooling, and compensating the scanning image motion by high-speed steering mirror was clarified. The design ideas of the mechanical configuration of the camera were explained in detail, and a set of calculation methods of imaging capabilities in low-light which can be applied in engineering were summarized. The basic principle of compensating image motion with steering mirror was studied, and the main frame of the camera was simulated, analyzed and calculated. According to the design and research results, the processing and assembly of the wide view aerial camera in low-light were completed. The camera has a ground sample distance (GSD) of 0.1 meters (height 1 km), and adaptable illumination range of 10-100000 lx, and a large view width of 3 times the height when the speed to height ratio is less than 0.04. The imaging quality of the system is excellent, and test results show that the MTF of the center field of view at 77 lp/mm is greater than 0.45. The images obtained from laboratory and field flight tests are clear, with high contrast and resolution, which can meet the requirements of use. At the same time, the system is 190 mm×140 mm×140 mm in actual size and 2800 g in weight, which is light and small. Copyright ?2021 Infrared and Laser Engineering. All rights reserved.Accession Number: 20220211449156 -
Record 262 of
Title:Grain-Orientation dependence about luminescence modulation behavior upon electric polarization in Sm3+ doped KSr2Nb5O15 textured ceramics
Author(s):Cao, Shuyao(1); Chen, Qian(1); Li, Yangping(1); Wu, Changying(2); Feng, Xiaoying(1); Xu, Jie(1); Cheng, Guanghua(2,3); Gao, Feng(1)Source: Materials Letters Volume: 295 Issue: DOI: 10.1016/j.matlet.2021.129866 Published: July 15, 2021Abstract:Sm3+ doped KSr2Nb5O15 textured ceramics with grain-orientation were fabricated using tape casting technology. The influences of the grain orientation on the microstructures, dielectric and ferroelectric properties were characterized. Moreover, the samples possessed luminescence modulation behavior after polarization, which exhibited obvious grain-orientation dependence. A considerable modulation ratio of approximately 69% was obtained along the [00l] direction of textured ceramics, which was almost twice that of ceramics without grain orientation. This work provided a new strategy for the enhancement of luminescence modulation properties in rare-earth activator-doped ferroelectric oxides. ? 2021 Elsevier B.V.Accession Number: 20211710255818 -
Record 263 of
Title:Novel strategy for the enhancement of anti-counterfeiting ability of photochromic ceramics: Sm3+ doped KSr2Nb5O15 textured ceramics with anisotropic luminescence modulation behavior
Author(s):Cao, Shuyao(1); Chen, Qian(1); Li, Yangping(1); Wu, Changying(2); Xu, Jie(1); Cheng, Guanghua(2,3); Gao, Feng(1)Source: Journal of the European Ceramic Society Volume: 41 Issue: 9 DOI: 10.1016/j.jeurceramsoc.2021.03.039 Published: August 2021Abstract:Sm3+ doped KSr2Nb5O15 (KSN-Sm) textured ceramics with anisotropic photochromic and luminescence modulation behaviors provided a new strategy for the enhancement of anti-counterfeiting ability. The KSN-Sm textured ceramics were fabricated by the tape casting technology, which exhibited obvious grain-orientation, with Lotgering factor f(00l) of 0.62. The textured sample possessed evident difference of reflectivity, photochromic, luminescent and luminescence modulation properties among various grain-orientated directions. The difference of luminescent emission intensity was over than 30 % and the luminescence modulation ratios Rt are 75.3 % and 63.3 % along paralleled and vertical [00l] orientations, respectively. These optical anisotropies were attributed to the different refractive indexes, distributions of photochromic centers and energy transfer rates at various orientations. This work is hopeful to achieve the multidirectional data recording and enhancement of anti-counterfeiting ability of photochromic ceramics by the anisotropic properties of textured ceramics. ? 2021 Elsevier LtdAccession Number: 20211410183041 -
Record 264 of
Title:A New Design of Large-format Streak Tube with Single-lens Focusing System
Author(s):Tian, Liping(1,2); Shen, Lingbin(1); Chen, Lin(1); Li, Lili(2); Tian, Jinshou(2); Chen, Ping(2); Zhao, Wei(2)Source: Measurement Science Review Volume: 21 Issue: 6 DOI: 10.2478/msr-2021-0026 Published: December 1, 2021Abstract:Streak tubes with large-format and high spatial resolution are central to mm-spatial-resolved STIL detection system and hyperspectral resolved ICF experiment. In this paper, we established a large-format streak tube with a three-coaxial-cylindrical single-lens focusing system, a spherically curved photocathode and phosphor screen model in CST Particle Studio. The temporal and spatial resolution were calculated and mimicked based on the Monte-Carlo sampling method in static and dynamic mode. The simulated results show that the static spatial resolution reaches 50 lp/mm over the whole 50 mm effective photocathode length, and the physical temporal resolution is better than 45 ps. Furthermore, in dynamic working mode, the streak tube can achieve spatial resolution of 10 lp/mm and temporal resolution of 60 ps. The simulation results will be used to guide the design and production for large-format with high spatial resolution streak tube development. ? 2021 Liping Tian et al., published by Sciendo.Accession Number: 20214511135998