Photonics最新文献_第5页

Simulation of a Pulsed Metastable Helium Lidar 模拟脉冲可变氦激光雷达

Photonics Pub Date : 2024-05-15 DOI: 10.3390/photonics11050465

Jiaxin Lan, Yuli Han, Ruocan Zhao, Tingdi Chen, Xianghui Xue, Dongsong Sun, Hang Zhou, Zhenwei Liu, Yingyu Liu

引用次数: 0

Polarimeter Optical Spectrum Analyzer 偏振计光光谱分析仪

Photonics Pub Date : 2024-05-05 DOI: 10.3390/photonics11060486

Eyal Buks

引用次数: 0

Intermodal Fiber Interferometer with Spectral Interrogation and Fourier Analysis of Output Signals for Sensor Application 用于传感器应用的带光谱干涉和傅里叶分析输出信号的联运光纤干涉仪

Photonics Pub Date : 2024-05-02 DOI: 10.3390/photonics11050423

Aleksandr Petrov, Andrey Golovchenko, Mikhail Bisyarin, Nikolai Ushakov, Oleg Kotov

引用次数: 0

Synthesis of Robust Full Poincaré Polarization States via Spatial Coherence Engineering 通过空间相干工程合成稳健的全频谱极化状态

Photonics Pub Date : 2024-03-22 DOI: 10.3390/photonics11040286

Ruihui Zhang, Ming Zhang, Zhen Dong, Fei Wang, Yangjian Cai, Yahong Chen

{"title":"Synthesis of Robust Full Poincaré Polarization States via Spatial Coherence Engineering","authors":"Ruihui Zhang, Ming Zhang, Zhen Dong, Fei Wang, Yangjian Cai, Yahong Chen","doi":"10.3390/photonics11040286","DOIUrl":"https://doi.org/10.3390/photonics11040286","url":null,"abstract":"The full Poincaré (FP) beam, encompassing all possible polarization states in its beam cross-section, has demonstrated advantages in various applications. However, conventional FP beams are typically considered as spatially fully coherent, rendering them sensitive to disturbances in the propagation path and susceptible to speckle effects. In this work, we propose an alternative approach to synthesize the optical beam with a FP polarization state through the spatial coherence engineering of a partially coherent beam. In this process, the FP polarization state is initially encoded into the spatial coherence structure of the beam source. We demonstrate that during the encoding process, the vector nature of the beam transitions from the FP polarization state to the spatial coherence structure of the source. However, during the propagation of the partially coherent beam, the vectorness reverts to the polarization state, resulting in the re-emergence of the encoded FP polarization in the output plane. We illustrate that the synthesized FP polarization state, achieved through spatial coherence engineering, is highly robust against obstructions in the propagation path. Furthermore, we examine the effect of the spatial coherence area of the beam on the quality of the recovered FP polarization state. The findings of this work can have valuable applications in optical trapping and optical imaging in complex environments.","PeriodicalId":503623,"journal":{"name":"Photonics","volume":" 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140217344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi-Mode Long-Wavelength GaAs/AlGaAs Quantum Well Infrared Photodetectors for Circular Polarization Detection 用于环形偏振探测的多模长波 GaAs/AlGaAs 量子阱红外光探测器

Photonics Pub Date : 2024-03-22 DOI: 10.3390/photonics11040285

Jianlin Feng, Hengrui Jiang, Jun Zhao, Dayuan Xiong

{"title":"Multi-Mode Long-Wavelength GaAs/AlGaAs Quantum Well Infrared Photodetectors for Circular Polarization Detection","authors":"Jianlin Feng, Hengrui Jiang, Jun Zhao, Dayuan Xiong","doi":"10.3390/photonics11040285","DOIUrl":"https://doi.org/10.3390/photonics11040285","url":null,"abstract":"We present an integrated device combining a double L-shaped chiral metasurface with long-wavelength GaAs/AlGaAs quantum well infrared photodetectors (QWIPs), achieving a circular polarized extinction ratio (CPER) as high as 45 in the long-wavelength infrared range of 7–9 μm. The unit of the chiral metasurface array consists of two structurally identical L-shaped gold structures with central symmetry. The CPER of the double L-shaped QWIPs is 14 times higher than that of a single L-shaped QWIP. The device operates in three modes within the detection band: the microcavity mode, the surface plasmon polariton (SPP) mode, and the hybrid mode. The double L-shaped chiral structure selects and reflects a small portion of left-handed circularly polarized light (LCP), while the majority enters the device and excites SPP modes with the bottom gold grating layer, leading to an absorption enhancement. In contrast, right-handed circularly polarized light (RCP) is mostly reflected with limited excitation of SPP waves. QWIPs exhibit a peak absorption of 0.8 and a coupling efficiency of 2700% in the active region of the quantum well due to the combined effects of the microcavity and SPP modes, in which the SPP mode plays a dominant role. The proposed device maintains high circular polarization discrimination capability under large incident angles and can be applied in spectral imaging.","PeriodicalId":503623,"journal":{"name":"Photonics","volume":" 56","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140213711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Line Illumination in Linear Array Photoacoustic Imaging Using a Powell Lens: A Proof-of-Concept Study 使用鲍威尔透镜的线性阵列光声成像中的线性照明：概念验证研究

Photonics Pub Date : 2024-03-22 DOI: 10.3390/photonics11040288

Seyed Mohsen Ranjbaran, Karl Kratkiewicz, Rayyan Manwar, K. Avanaki

引用次数: 0

Pseudo-Stilbene- and Azobenzene-Type Systems for Optical Frequency Conversion: Estimating the First-Order Molecular Hyperpolarizability 用于光频转换的伪二苯乙烯和偶氮苯型系统：估算一阶分子超极化率

Photonics Pub Date : 2024-03-21 DOI: 10.3390/photonics11030283

Raiane S. Araújo, J J Rodrigues, M. A. Alencar, Jamal Rafique, S. Saba, L. Abegão

{"title":"Pseudo-Stilbene- and Azobenzene-Type Systems for Optical Frequency Conversion: Estimating the First-Order Molecular Hyperpolarizability","authors":"Raiane S. Araújo, J J Rodrigues, M. A. Alencar, Jamal Rafique, S. Saba, L. Abegão","doi":"10.3390/photonics11030283","DOIUrl":"https://doi.org/10.3390/photonics11030283","url":null,"abstract":"This study investigates the potential of a set of pseudo-stilbene and azobenzene molecular structures to become optical frequency converters for optical communications based on a detailed exploration of the first-order molecular hyperpolarizability (βHRS), which is the microscopic counterpart of second harmonic generation (SHG). βHRS values were obtained via quantum chemical calculations using the Gaussian 16 software package in solvent and gas-phase media at different wavelengths, i.e., 1064 nm, 1310 nm, and 1510 nm. The latter two wavelengths are of particular interest for optical communications. Our study focused on discerning how the molecular structure influences the βHRS response, explicitly highlighting the influence of the azomethine group (CH=N). The results revealed that the molecular planarity, affected by this group, plays a crucial role in modulating the optical properties. The highest βHRS value in a solvent medium using the CAM-B3LYP/6-311+G(2d,p) level of theory achieved in this work was around 1400 ×10−30cm4startvolt−1, four orders of magnitude higher than KDP (0.2 ×10−30cm4startvolt−1), which is a reference in SHG experiments at 1064 nm. The highest calculated βHRS value at the same level of theory and solvent at 1310 nm and 1550 nm was 631 × 10−30cm4startvolt−1 and 456 × 10−30cm4startvolt−1, respectively. All these values belong to molecular structures with azo-coupling with donor (4-NMe2) and acceptor (4′-NO2) peripheral groups, designated as AB-3.","PeriodicalId":503623,"journal":{"name":"Photonics","volume":"2 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140222692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synergy of Nd:YAG Picosecond Pulsed Laser Irradiation and Electrochemical Anodization in the Formation of TiO2 Nanostructures for the Photocatalytic Degradation of Pesticide Carbofuran Nd:YAG 皮秒脉冲激光辐照和电化学阳极氧化在形成用于光催化降解农药克百威的 TiO2 纳米结构中的协同作用

Photonics Pub Date : 2024-03-21 DOI: 10.3390/photonics11030284

Miloš Tošić, V. Rajić, D. Pjević, S. Stojadinović, N. Krstulović, S. Dimitrijević-Branković, Miloš Momčilović

{"title":"Synergy of Nd:YAG Picosecond Pulsed Laser Irradiation and Electrochemical Anodization in the Formation of TiO2 Nanostructures for the Photocatalytic Degradation of Pesticide Carbofuran","authors":"Miloš Tošić, V. Rajić, D. Pjević, S. Stojadinović, N. Krstulović, S. Dimitrijević-Branković, Miloš Momčilović","doi":"10.3390/photonics11030284","DOIUrl":"https://doi.org/10.3390/photonics11030284","url":null,"abstract":"This study proposes a simple and controlled method for producing TiO2 with phase junction, oxygen vacancies, and Ti3+ by combining picosecond pulsed laser irradiation and electrochemical anodization. Ti mesh was pretreated by irradiating with a picosecond pulsed laser technique using an Nd:YAG laser (1064 nm) at two fluencies, 15 J/cm2 and 30 J/cm2. The samples were then subjected to electrochemical anodization to form TiO2 nanotube arrays on the previously laser-treated surface. This study will investigate the possibility of forming TiO2 nanotube arrays on a pre-laser-treated Ti substrate and determine their physicochemical and photocatalytic properties. The samples were characterized by FESEM, XRD, Raman, XPS, and UV-Vis DRS. UV-Vis spectroscopy was used to observe the progress of photocatalytic degradation for all samples, and degradation products were determined using GC-MS. With the synergistic effects of phase junction, oxygen vacancies, and Ti3+, the laser-treated TiO2 with 30 J/cm2 showed a higher photocatalytic degradation rate (85.1%) of the pesticide carbofuran compared to non-laser-treated TiO2 (54.8%), remaining stable during successive degradation cycles, which has promising practical applications.","PeriodicalId":503623,"journal":{"name":"Photonics","volume":" 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140222009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparison of Optogalvanic and Laser-Induced Fluorescence Spectroscopy 光致荧光光谱与激光诱导荧光光谱的比较

Photonics Pub Date : 2024-03-21 DOI: 10.3390/photonics11030279

L. Windholz

引用次数: 0

Numerical MCRT Simulation and Inter-Symbol Interference Analysis of Laser Multipath Transmission in Airborne Air-to-Air Channels 机载空对空信道中激光多径传输的 MCRT 数值模拟和符号间干扰分析

Photonics Pub Date : 2024-03-21 DOI: 10.3390/photonics11030280

Shiqi Wu, Yanan Li, Jun Wang, Haijun Zhou, Chengmao Tang, Yijie Guan, Fei Guo, Xiaofeng Li

引用次数: 0