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Research on the Performance of Non-Line-of-Sight Ultraviolet Communication in Rain and Fog Environment
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作者 Siqi Zhang 《Journal of Computer and Communications》 2024年第8期191-201,共11页
Wireless ultraviolet communication is a new type of communication mode. It refers to the transmission of information through the scattering of ultraviolet light by atmospheric particles and aerosol particles. The scat... Wireless ultraviolet communication is a new type of communication mode. It refers to the transmission of information through the scattering of ultraviolet light by atmospheric particles and aerosol particles. The scattering characteristics can enable the wireless ultraviolet communication system to transmit ultraviolet light signals in a non-line-of-sight manner, which overcomes the weakness that other free space optical communications must work in a line-of-sight manner. Based on the basic theory of scattering and absorption in atmospheric optics, taking the ultraviolet light with a wavelength of 266 nm as an example, this paper introduces the classical model of non-line-of-sight single-scattering coplanarity based on the ellipsoid coordinate system. The model is used to simulate and analyze the relationship between the geometric parameters such as transmission distance, transceiver elevation angle and transceiver half-angle and the received optical power per unit area. The performance of non-line-of-sight ultraviolet communication system in rain and fog environment is discussed respectively. The results show that the transmission quality of non-line-of-sight ultraviolet atmospheric propagation is greatly affected by the communication distance. As the distance increases, the received light power per unit area gradually decreases. In addition, increasing the emission elevation angle, the receiving elevation angle and the receiving half angle is an important way to improve the system performance. 展开更多
关键词 Ultraviolet Light Single Scattering optical Scattering Communication NLOS MATLAB
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Optical polarization imaging for underwater target detection with non-scatter background 被引量:7
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作者 GUAN Jin-ge ZHAO Yong +3 位作者 ZHENG Yong-qiu MA Miao SUN Peng XUE Chen-yang 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2020年第4期335-342,共8页
For conventional optical polarization imaging of underwater target,the polarization degree of backscatter should be pre-measured by averaging the pixel intensities in the no target region of the polarization images,an... For conventional optical polarization imaging of underwater target,the polarization degree of backscatter should be pre-measured by averaging the pixel intensities in the no target region of the polarization images,and the polarization property of the target is assumed to be completely depolarized.When the scattering background is unseen in the field of view or the target is polarized,conventional method is helpless in detecting the target.An improvement is to use lots of co-polarization and cross polarization detection components.We propose a polarization subtraction method to estimate depolarization property of the scattering noise and target signal.And experiment in a quartz cuvette container is performed to demonstrate the effectiveness of the proposed method.The results show that the proposed method can work without scattering background reference,and further recover the target along with smooth surface for polarization preserving response.This study promotes the development of optical polarization imaging systems in underwater environments. 展开更多
关键词 polarization imaging underwater optical scattering optical information processing target detection
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Optical scattering imaging with sub-nanometer precision based on position-ultra-sensitive giant Lamb shift
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作者 Zeyang Liao Yu-Wei Lu +1 位作者 Wei Li Xue-Hua Wang 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2024年第6期96-105,共10页
The Lamb shift of a quantum emitter in close proximity to a plasmonic nanostructure can be three or more orders of magnitude larger than that in the free space and is ultra-sensitive to the emitter position and polari... The Lamb shift of a quantum emitter in close proximity to a plasmonic nanostructure can be three or more orders of magnitude larger than that in the free space and is ultra-sensitive to the emitter position and polarization.We demonstrate that this large Lamb shift can be sensitively observed from the scattering or absorption spectrum dip shift of the coupled system when the plasmonic nanoparticle or tip scans the emitter.Using these observations,we propose a scanning optical scattering imaging method based on the plasmonic-enhanced Lamb shift with achieves sub-nanometer resolution.Our method is based on the scattering or absorption spectrum of the plasmon-emitter coupling system,which is free of the fluorescence quenching problem and easier to implement in a plasmon-emitter coupling system.In addition,our scheme works even if the quantum emitter is slightly below the dielectric surface,which can bring about broader applications,such as detecting atoms and molecules or quantum dots above or under a surface. 展开更多
关键词 Lamb shift PLASMON optical scattering imaging
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Artificial intelligence assisted light control and computational imaging through scattering media 被引量:9
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作者 Shengfu Cheng Huanhao Li +2 位作者 Yunqi Luo Yuanjin Zheng Puxiang Lai 《Journal of Innovative Optical Health Sciences》 SCIE EI CAS 2019年第4期32-45,共14页
Coherent optical control within or through scattering media via wavefront shaping has seen broad applications since its invention around 2007.Wavefront shaping is aimed at overcoming the strong scattering,featured by ... Coherent optical control within or through scattering media via wavefront shaping has seen broad applications since its invention around 2007.Wavefront shaping is aimed at overcoming the strong scattering,featured by random interference,namely speckle patterns.This randomness occurs due to the refractive index inhomogeneity in complex media like biological tissue or the modal dispersion in multimode fiber,yet this randomness is actually deterministic and potentially can be time reversal or precompensated.Various wavefront shaping approaches,such as optical phase conjugation,iterative optimization,and transmission matrix measurement,have been developed to generate tight and intense optical delivery or high-resolution image of an optical object behind or within a scattering medium.The performance of these modula-tions,however,is far from satisfaction.Most recently,artifcial intelligence has brought new inspirations to this field,providing exciting hopes to tackle the challenges by mapping the input and output optical patterns and building a neuron network that inherently links them.In this paper,we survey the developments to date on this topic and briefly discuss our views on how to harness machine learning(deep learning in particular)for further advancements in the field. 展开更多
关键词 optical scattering deep learning wavefront shaping adaptive optics computational imaging
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A STUDY ON PENETRATION DEPTH OF POLARIZATION IMAGING 被引量:1
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作者 RAN LIAO NAN ZENG +3 位作者 DONGZHI LI TIANLIANG YUN YONGHONG HE HUI MA 《Journal of Innovative Optical Health Sciences》 SCIE EI CAS 2010年第3期177-181,共5页
Optical clearing improves the penetration depth of optical measurements in turbid tissues.Polarization imaging has been demonstrated as a potentially promising tool for detecting cancers in superficial tissues,but its... Optical clearing improves the penetration depth of optical measurements in turbid tissues.Polarization imaging has been demonstrated as a potentially promising tool for detecting cancers in superficial tissues,but its limited depth of detection is a major obstacle to the effective application in clinical diagnosis.In the present paper,detection depths of two polarization imaging methods,i.e.,rotating linear polarization imaging(RLPI)and degree of polarization imaging(DOPI),are examined quantitatively using both experiments and Monte Carlo simulations.The results show that the contrast curves of RLPI and DOPI are different.The characteristic depth of DOPI scales with transport mean free path length,and that of RLPI increases slightly with g.Both characteristic depths of RLPI and DOPI are on the order of transport mean free path length and the former is almost twice as large as the latter.It is expected that they should have different response to optical clearing process in tissues. 展开更多
关键词 Polarization imaging penetration depth optical scattering
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Influence of trap-assisted tunneling on trap-assisted tunneling current in double gate tunnel field-effect transistor 被引量:1
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作者 蒋智 庄奕琪 +2 位作者 李聪 王萍 刘予琪 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第2期463-467,共5页
Trap-assisted tunneling(TAT) has attracted more and more attention, because it seriously affects the sub-threshold characteristic of tunnel field-effect transistor(TFET). In this paper, we assess subthreshold perf... Trap-assisted tunneling(TAT) has attracted more and more attention, because it seriously affects the sub-threshold characteristic of tunnel field-effect transistor(TFET). In this paper, we assess subthreshold performance of double gate TFET(DG-TFET) through a band-to-band tunneling(BTBT) model, including phonon-assisted scattering and acoustic surface phonons scattering. Interface state density profile(D_(it)) and the trap level are included in the simulation to analyze their effects on TAT current and the mechanism of gate leakage current. 展开更多
关键词 trap-assisted tunneling (TAT) tunnel field-effect transistors (TFETs) optical phonon scattering (OP) acoustic phonon scattering (AP)
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FRACTAL NATURE OF LIGHT SCATTERING IN TISSUES
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作者 STEVEN L.JACQUES 《Journal of Innovative Optical Health Sciences》 SCIE EI CAS 2011年第1期1-7,共7页
Light scattering by a tissue has a wavelength dependence that depends on the size distribution of scatterers in the tissue.By measuring the wavelength dependence of scattering,one can deduce changes in the nanoscale a... Light scattering by a tissue has a wavelength dependence that depends on the size distribution of scatterers in the tissue.By measuring the wavelength dependence of scattering,one can deduce changes in the nanoscale architecture of cells and tissues.This report discusses the connection between nanoscale architecture and measurable light scattering.The significance of this work is to develop label-free optical imaging that describes tissue structure,to complement the absorption,fluorescence,and Raman scattering spectra that describe the chemical constituents of a tissue. 展开更多
关键词 optical scattering FRACTAL biomedical optics
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Angular-modulated spatial distribution of ultrahigh-order modes assisted by random scattering
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作者 阚雪芬 殷澄 +4 位作者 许田 陈凡 李建 韩庆邦 陈险峰 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第11期254-257,共4页
In designing an optical waveguide with metallic films on a nanometer scale, the random scattering by the natural roughness of the thin film is always ignored. In this paper, we demonstrate that for the ultrahigh-order... In designing an optical waveguide with metallic films on a nanometer scale, the random scattering by the natural roughness of the thin film is always ignored. In this paper, we demonstrate that for the ultrahigh-order modes(UOMs) in the symmetric metal cladding waveguide, such a scattering leads to drastic variations in their spatial distribution at different incident angles. Owing to the high mode density of the UOMs, the random scattering induced coupling can be easily related to different modes with different propagation directions or wavenumbers. At small incident angles, the intra-mode coupling dominates, which results in a spatial distribution in the form of concentric rings. At large incident angles, the inter-mode coupling plays the most important role and leads to an array-like pattern. Experimental evidence via optically trapped nanoparticles support the theoretical hypothesis. 展开更多
关键词 metallic waveguide random scattering optical trapping
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Iterative physical optics model for electromagnetic scattering and Doppler analysis
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作者 Changze Li Chuangming Tong +1 位作者 Yan Bai Lihui Qi 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2016年第3期581-589,共9页
An iterative physical optics(IPO) model is proposed to solve extra large scale electric electromagnetic(EM) scattering from randomly rough surfaces. In order to accelerate the convergence of the IPO model, the for... An iterative physical optics(IPO) model is proposed to solve extra large scale electric electromagnetic(EM) scattering from randomly rough surfaces. In order to accelerate the convergence of the IPO model, the forward-backward methodology and its modification with underrelaxation iteration are developed to simulate the rough surface scattering; the local iteration methodology and the fast far field approximation(Fa FFA) in the matrix-vector product are proposed to reduce greatly the computational complexity. These techniques make Monte Carlo simulations possible. Thus, the average Doppler spectra of backscattered signals obtained from the simulations are compared for different incident angles and sea states. In particular, the simulations show a broadening of the Doppler spectra for a more complicated sea state at a low grazing angle(LGA). 展开更多
关键词 electromagnetic(EM) scattering iterative physical optics(IPO) Doppler spectra high frequency surface wave radar(HFSWR)
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Optical tracking of picosecond coherent phonon pulse focusing inside a sub-micron object 被引量:3
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作者 Thomas Dehoux Kenichi Ishikawa +7 位作者 Paul H Otsuka Motonobu Tomoda Osamu Matsuda Masazumi Fujiwara Shigeki Takeuchi Istvan A Veres Vitalyi E Gusev Oliver B Wright 《Light(Science & Applications)》 SCIE EI CAS CSCD 2016年第1期653-659,共7页
By means of an ultrafast optical technique,we track focused gigahertz coherent phonon pulses in objects down to sub-micron in size.Infrared light pulses illuminating the surface of a single metal-coated silica fibre g... By means of an ultrafast optical technique,we track focused gigahertz coherent phonon pulses in objects down to sub-micron in size.Infrared light pulses illuminating the surface of a single metal-coated silica fibre generate longitudinal-phonon wave packets.Reflection of visible probe light pulses from the fibre surface allows the vibrational modes of the fibre to be detected,and Brillouin optical scattering of partially transmitted light pulses allows the acoustic wavefronts inside the transparent fibre to be continuously monitored.We thereby probe acoustic focusing in the time domain resulting from generation at the curved fibre surface.An analytical model,supported by three-dimensional simulations,suggests that we have followed the focusing of the acoustic beam down to a~150-nm diameter waist inside the fibre.This work significantly narrows the lateral resolution for focusing of picosecond acoustic pulses,normally limited by the diffraction limit of focused optical pulses to~1μm,and thereby opens up a new range of possibilities including nanoscale acoustic microscopy and nanoscale computed tomography. 展开更多
关键词 acoustic–optic fibre optical scattering PICOSECOND ULTRASONICS
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Recent Progress in Distributed Optical Fiber Raman Photon Sensors at China Jiliang University 被引量:8
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作者 Zaixuan ZHANG Jianfeng WANG +11 位作者 Yi LI HuapingGONG Xiangdong YU Honglin LIU Yongxing JIN Juan KANG Chenxia LI Wensheng ZHANG Wenping ZHANG Chunliu ZHAO Xinyong DONG Shangzhong JIN 《Photonic Sensors》 SCIE EI CAS 2012年第2期127-147,共21页
A brief review of recent progress in researches, productions and applications of full distributed fiber Raman photon sensors at China Jiliang University (CJLU) is presented. In order to improve the measurement dista... A brief review of recent progress in researches, productions and applications of full distributed fiber Raman photon sensors at China Jiliang University (CJLU) is presented. In order to improve the measurement distance, the accuracy, the space resolution, the ability of multi-parameter measurements, and the intelligence of full distributed fiber sensor systems, a new generation fiber sensor technology based on the optical fiber nonlinear scattering fusion principle is proposed. A series of new generation full distributed fiber sensors are investigated and designed, which consist of new generation ultra-long distance full distributed fiber Raman and Rayleigh scattering photon sensors integrated with a fiber Raman amplifier, auto-correction full distributed fiber Raman photon temperature sensors based on Raman correlation dual sources, full distributed fiber Raman photon temperature sensors based on a pulse coding source, full distributed fiber Raman photon temperature sensors using a fiber Raman wavelength shifter, a new type of Brillouin optical time domain analyzers (BOTDAs) integrated with a fiber Raman amplifier for replacing a fiber Brillouin amplifier, full distributed fiber Raman and Brillouin photon sensors integrated with a fiber Raman amplifier, and full distributed fiber Brillouin photon sensors integrated with a fiber Brillouin frequency shifter. The Internet of things is believed as one of candidates of the next technological revolution, which has driven hundreds of millions of class markets. Sensor networks are important components of the Internet of things. The full distributed optical fiber sensor network (Rayleigh, Raman, and Brillouin scattering) is a 3S (smart materials, smart structure, and smart skill) system, which is easy to construct smart fiber sensor networks. The distributed optical fiber sensor can be embedded in the power grids, railways, bridges, tunnels, roads, constructions, water supply systems, dams, oil and gas pipelines and other facilities, and can be integrated with wireless networks. 展开更多
关键词 Distributed optical fiber sensor Raman scattering Rayleigh scattering Brillouin scattering fusionprinciple of optical fiber nonlinear scattering optical time domain reflectometry (OTDR)
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Round-trip imaging through scattering media based on optical transmission matrix 被引量:2
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作者 Bin Zhuang Chengfang Xu +5 位作者 Yi Geng Guangzhi Zhao Hui Chen Zhengquan He Zhaoxin Wu Liyong Ren 《Chinese Optics Letters》 SCIE EI CAS CSCD 2018年第4期66-69,共4页
Traditional one-way imaging methods become invalid when a target object is completely hidden behind scattering media. In this case, it has been much more challenging, since the light wave is distorted twice.To solve t... Traditional one-way imaging methods become invalid when a target object is completely hidden behind scattering media. In this case, it has been much more challenging, since the light wave is distorted twice.To solve this problem, we propose an imaging method, so-called round-trip imaging, based on the optical transmission matrix of the scattering medium. We show that the object can be recovered directly from the distorted output wave, where no scanning is required during the imaging process. We predict that this method might improve the imaging speed and have potential application for real-time imaging. 展开更多
关键词 Round-trip imaging through scattering media based on optical transmission matrix
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Simple Raman scattering sensor integrated with a metallic planar optical waveguide: effective modulation via minor structural adjustment 被引量:1
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作者 陆炎 阚雪芬 +4 位作者 许田 方靖淮 王孟 殷澄 陈险峰 《Chinese Optics Letters》 SCIE EI CAS CSCD 2018年第1期71-75,共5页
We report experimental realization of Raman spectra enhancement of copper phthalocyanine, using an on-chip metallic planar waveguide of the sub-millimeter scale. The oscillating ultrahigh order modes excited by the di... We report experimental realization of Raman spectra enhancement of copper phthalocyanine, using an on-chip metallic planar waveguide of the sub-millimeter scale. The oscillating ultrahigh order modes excited by the direct coupling method yield high optical intensity at resonance, which is different from the conventional strategy to create localized "hot spots." The observed excitation efficiency of the Raman signal is significantly enhanced,owing to the high Q factor of the resonant cavity. Furthermore, effective modulation of the Raman intensity is available by adjusting the polymethyl methacrylate(PMMA) thickness in the guiding layer, i.e., by tuning the light–matter interaction length. A large modulation depth is verified through the fact that 10 times variation in the enhancement factor is observed in the experiment as the PMMA thickness varies from 7 to 23 μm. 展开更多
关键词 Simple Raman scattering sensor integrated with a metallic planar optical waveguide effective modulation via minor structural adjustment
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Infrared nanoimaging of nanoscale sliding dislocation of collagen fibrils 被引量:2
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作者 Zhi Qiao Mengfei Xue +4 位作者 Yongqian Zhao Yindong Huang Ming Zhang Chao Chang Jianing Chen 《Nano Research》 SCIE EI CSCD 2022年第3期2355-2361,共7页
Collagen,one of the major components in the mammalian connective tissues,plays an essential role in many vital physiological processes.Many common diseases,such as fibrosis,overuse injuries,and bone fracture,are assoc... Collagen,one of the major components in the mammalian connective tissues,plays an essential role in many vital physiological processes.Many common diseases,such as fibrosis,overuse injuries,and bone fracture,are associated with collagen arrangement defects.However,the underlying mechanism of collagen arrangement defects remains elusive.In this study,we applied infrared scattering-type scanning near-field optical microscopy to study collagen fibrils’structural properties.Experimentally,we observed two types of collagen fibrils’arrangement with different periodic characteristics.A crystal sliding model was employed to explain this observation qualitatively.Our results suggest that the collagen dislocation propagates in collagen fibrils,which may shed light on many collagen diseases’pathogenesis.These findings help to understand the regulation mechanism of hierarchical biological structure. 展开更多
关键词 scattering near-field optical microscopy collagen fibrils DISLOCATION D periodicity
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Model of Raman–Nath acousto-optic diffraction 被引量:1
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作者 翁存程 章小曼 《Chinese Optics Letters》 SCIE EI CAS CSCD 2015年第10期81-85,共5页
In this Letter, we discuss Raman–Nath acousto-optic diffraction, and a new model of Raman–Nath acousto-optic diffraction is presented. The model is based on the individual and simultaneous occurrences of phase-grati... In this Letter, we discuss Raman–Nath acousto-optic diffraction, and a new model of Raman–Nath acousto-optic diffraction is presented. The model is based on the individual and simultaneous occurrences of phase-grating diffraction and the Doppler effect and optical phase modulation and photon–phonon scattering. We find that the optical phase modulation can cause temporal and spatial fluctuations of the diffracted light power escaping from the acoustic field. 展开更多
关键词 optic Model of Raman phonon grating simultaneous transducer distilled spatially absorber scatter
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Folding model calculations for ~6He+^(12)C elastic scattering
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作者 Awad A.Ibraheem 《Chinese Physics C》 SCIE CAS CSCD 2016年第3期66-73,共8页
In the framework of the double folding model, we used the α+2n and di-triton configurations for the nuclear matter density of the ~6He nucleus to generate the real part of the optical potential for the system ~6He+... In the framework of the double folding model, we used the α+2n and di-triton configurations for the nuclear matter density of the ~6He nucleus to generate the real part of the optical potential for the system ~6He+^(12)C. As an alternative, we also use the high energy approximation to generate the optical potential for the same system. The derived potentials are employed to analyze the elastic scattering differential cross section at energies of 38.3, 41.6 and 82.3 Me V/u. For the imaginary part of the potential we adopt the squared Woods-Saxon form. The obtained results are compared with the corresponding measured data as well as with available results in the literature. The calculated total reaction cross sections are investigated and compared with the optical limit Glauber model description. 展开更多
关键词 optical model elastic scattering halo nuclei folding model glauber model
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