Pub Date : 2024-11-18DOI: 10.1109/JPHOT.2024.3500358
Huicheng Guo;Chengpu Liu
By using the finite-difference time-domain (FDTD) method, this paper studys the entire-space distribution of terahertz emission generated by a two-color field induced micro-plasma based on photocurrent model. The spatial distributions of terahertz spectra and waveforms versus emission angle are investigated in three planes perpendicular with each other for the first time, and the results show that terahertz emission mainly focuses on forward direction with polarization same as the excitation field. When emission angle increasing, the bandwidth narrows, the peak frequency red shifts, the emission intensity decreases, and the obtained results are accurately explained based on coherent superposition mechanism. In addition, through comparing theoretical results with experimental data, the correctness of terahertz emission distribution in entire space is comfirmed.
{"title":"Investigation of Entire-Space Terahertz Emission From Gas Filament Excited by a Two-Color Field","authors":"Huicheng Guo;Chengpu Liu","doi":"10.1109/JPHOT.2024.3500358","DOIUrl":"https://doi.org/10.1109/JPHOT.2024.3500358","url":null,"abstract":"By using the finite-difference time-domain (FDTD) method, this paper studys the entire-space distribution of terahertz emission generated by a two-color field induced micro-plasma based on photocurrent model. The spatial distributions of terahertz spectra and waveforms versus emission angle are investigated in three planes perpendicular with each other for the first time, and the results show that terahertz emission mainly focuses on forward direction with polarization same as the excitation field. When emission angle increasing, the bandwidth narrows, the peak frequency red shifts, the emission intensity decreases, and the obtained results are accurately explained based on coherent superposition mechanism. In addition, through comparing theoretical results with experimental data, the correctness of terahertz emission distribution in entire space is comfirmed.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"16 6","pages":"1-6"},"PeriodicalIF":2.1,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10755969","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142713898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-18DOI: 10.1109/JPHOT.2024.3500772
Yitong Li;Jianguo Yu;Naibo Zhang;Kun Deng;Guangyao Yang;Ruiliang Song
We proposed and experimentally demonstrated a novel method to generate an adaptive N 2 -quadrature amplitude modulation ( N 2 -QAM) W-band vector millimeter wave (mm-wave) signal based on intensity modulators without digital to analog converter (DAC). Two N-amplitude shift keying (N-ASK) signals are synthesized into N 2 -QAM W-band mm-wave vector signals by employing two Mach-Zehnder modulators, paralleling phase shifters, attenuators and a single optical mixer. In this scheme, DAC and additional digital signal processing are omitted at the transmitter, and double bit rate can be obtained at the user end. Taking the case of N = 2 as an example, we finally used 2-ASK signals to generate 80-GHz 4-QAM W-band mm-wave, and completed its high-performance transmission over a 1-m wireless link. The measured bit error rate (BER) performance can reach below 7% hard-decision forward-error-correction (HD-FEC) threshold of 3.8 × 10 −3 .
我们提出并通过实验证明了一种基于强度调制器、无需数模转换器（DAC）即可生成自适应 N2-QAM W 波段矢量毫米波（mm-wave）信号的新方法。通过使用两个马赫-泽恩德（Mach-Zehnder）调制器、并联移相器、衰减器和单个光混频器，将两个 N 振幅移调（N-ASK）信号合成为 N2-QAM W 波段毫米波矢量信号。在这种方案中，发射器省略了 DAC 和额外的数字信号处理，用户端可获得双倍比特率。以 N = 2 的情况为例，我们最终使用 2-ASK 信号生成了 80-GHz 4-QAM W 波段毫米波，并在 1 米长的无线链路上完成了高性能传输。测得的误码率（BER）性能低于 7% 的硬判定前向纠错（HD-FEC）阈值 3.8 × 10-3。
{"title":"W-Band Vector Millimeter Wave Signal Generation Based on Intensity Modulators Without DAC","authors":"Yitong Li;Jianguo Yu;Naibo Zhang;Kun Deng;Guangyao Yang;Ruiliang Song","doi":"10.1109/JPHOT.2024.3500772","DOIUrl":"https://doi.org/10.1109/JPHOT.2024.3500772","url":null,"abstract":"We proposed and experimentally demonstrated a novel method to generate an adaptive \u0000<italic>N</i>\u0000<sup>2</sup>\u0000-quadrature amplitude modulation (\u0000<italic>N</i>\u0000<sup>2</sup>\u0000-QAM) W-band vector millimeter wave (mm-wave) signal based on intensity modulators without digital to analog converter (DAC). Two N-amplitude shift keying (N-ASK) signals are synthesized into \u0000<italic>N</i>\u0000<sup>2</sup>\u0000-QAM W-band mm-wave vector signals by employing two Mach-Zehnder modulators, paralleling phase shifters, attenuators and a single optical mixer. In this scheme, DAC and additional digital signal processing are omitted at the transmitter, and double bit rate can be obtained at the user end. Taking the case of N = 2 as an example, we finally used 2-ASK signals to generate 80-GHz 4-QAM W-band mm-wave, and completed its high-performance transmission over a 1-m wireless link. The measured bit error rate (BER) performance can reach below 7% hard-decision forward-error-correction (HD-FEC) threshold of 3.8 × 10\u0000<sup>−3</sup>\u0000.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 1","pages":"1-6"},"PeriodicalIF":2.1,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10755071","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Realizing always atomic translation frequency output, single-mode, high frequency stability, narrow linewidth semiconductor lasers, is one of the ultimate visions of areas related to quantums, such as quantum precision measurement and atomic physics. A single-mode Cs atom 852 nm Faraday laser, utilizing a corner cube retroreflector as the feedback element, is demonstrated and termed as a corner-cube-feedback Faraday laser. Its output frequency remains close to the Cs atomic Doppler-broadened transition line, and through the optimization of the working parameters of Faraday anomalous dispersion optical filter (FADOF), the laser output mode can still remain single, even though the diode current changes from 55 mA to 155 mA (with incremental step of approximately 2 mA) and the diode working temperature varies from $11.8 ,mathrm{^{circ }C}$ to $37.2 ,mathrm{^{circ }C}$ (with incremental step of approximately $3.5 ,mathrm{^{circ }C}$ ). Also, the single-mode laser oscillation can be achieved over a substantial angular range, specifically between +3 $mathrm{^{circ }}$ and −3 $mathrm{^{circ }}$ , where the angle is defined as the deviation of the incident light from the optical axis of the corner cube. Using the corner-cube retroreflector as external cavity feedback element, the environmental compatibility and reliability can be improved due to the precise reflection of the incident light beam back to its original direction. The most probable linewidth is 8 kHz measured by heterodyne beating with two identical lasers. The output power can achieve a maximum of 57 mW at 155 mA. As for the noise performance of the laser, the typical value of relative intensity noise (RIN) at 10 kHz is lower than −134 dBc/Hz. The pahse noise of the laser is superior than the commerical product. This single-mode corner-cube-feedback Faraday laser can be widely used in quantum precision measurement, such as atomic clocks, atomic gravimeters, and atomic magnetometers, etc.
{"title":"A Single-Mode 852-nm Faraday Laser","authors":"Zhiyang Wang;Zijie Liu;Jianxiang Miao;Hangbo Shi;Xiaomin Qin;Xiaolei Guan;Jia Zhang;Pengyuan Chang;Tiantian Shi;Jingbiao Chen","doi":"10.1109/JPHOT.2024.3501374","DOIUrl":"https://doi.org/10.1109/JPHOT.2024.3501374","url":null,"abstract":"Realizing always atomic translation frequency output, single-mode, high frequency stability, narrow linewidth semiconductor lasers, is one of the ultimate visions of areas related to quantums, such as quantum precision measurement and atomic physics. A single-mode Cs atom 852 nm Faraday laser, utilizing a corner cube retroreflector as the feedback element, is demonstrated and termed as a corner-cube-feedback Faraday laser. Its output frequency remains close to the Cs atomic Doppler-broadened transition line, and through the optimization of the working parameters of Faraday anomalous dispersion optical filter (FADOF), the laser output mode can still remain single, even though the diode current changes from 55 mA to 155 mA (with incremental step of approximately 2 mA) and the diode working temperature varies from \u0000<inline-formula><tex-math>$11.8 ,mathrm{^{circ }C}$</tex-math></inline-formula>\u0000 to \u0000<inline-formula><tex-math>$37.2 ,mathrm{^{circ }C}$</tex-math></inline-formula>\u0000 (with incremental step of approximately \u0000<inline-formula><tex-math>$3.5 ,mathrm{^{circ }C}$</tex-math></inline-formula>\u0000). Also, the single-mode laser oscillation can be achieved over a substantial angular range, specifically between +3\u0000<inline-formula><tex-math>$mathrm{^{circ }}$</tex-math></inline-formula>\u0000and −3\u0000<inline-formula><tex-math>$mathrm{^{circ }}$</tex-math></inline-formula>\u0000, where the angle is defined as the deviation of the incident light from the optical axis of the corner cube. Using the corner-cube retroreflector as external cavity feedback element, the environmental compatibility and reliability can be improved due to the precise reflection of the incident light beam back to its original direction. The most probable linewidth is 8 kHz measured by heterodyne beating with two identical lasers. The output power can achieve a maximum of 57 mW at 155 mA. As for the noise performance of the laser, the typical value of relative intensity noise (RIN) at 10 kHz is lower than −134 dBc/Hz. The pahse noise of the laser is superior than the commerical product. This single-mode corner-cube-feedback Faraday laser can be widely used in quantum precision measurement, such as atomic clocks, atomic gravimeters, and atomic magnetometers, etc.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"16 6","pages":"1-9"},"PeriodicalIF":2.1,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10756729","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142736407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-13DOI: 10.1109/JPHOT.2024.3497182
Dequan Li;Dong Wang
Piston error is the main component of the co-phase errors of segmented telescopes. In this paper, we innovatively performed frequency domain filtering and processing on the focal plane image of the segmented telescopes with mask added, and obtained the image that only reflects the piston error between each submirror and the reference submirror. The representation of feature image that reflects each submirror's piston error which obtained by this method is the same.Therefore, regardless of the number or the arrangement of submirrors, the single shallow convolutional neural network trained by any of the extracted submirror interference image dataset can be used to achieve high-precision detection of different submirror piston errors.Finally, simulation experiment results show the effectiveness of the proposed method.
{"title":"High Precision Piston Error Sensing of Segmented Telescope Based on Frequency Domain Filtering","authors":"Dequan Li;Dong Wang","doi":"10.1109/JPHOT.2024.3497182","DOIUrl":"https://doi.org/10.1109/JPHOT.2024.3497182","url":null,"abstract":"Piston error is the main component of the co-phase errors of segmented telescopes. In this paper, we innovatively performed frequency domain filtering and processing on the focal plane image of the segmented telescopes with mask added, and obtained the image that only reflects the piston error between each submirror and the reference submirror. The representation of feature image that reflects each submirror's piston error which obtained by this method is the same.Therefore, regardless of the number or the arrangement of submirrors, the single shallow convolutional neural network trained by any of the extracted submirror interference image dataset can be used to achieve high-precision detection of different submirror piston errors.Finally, simulation experiment results show the effectiveness of the proposed method.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"16 6","pages":"1-6"},"PeriodicalIF":2.1,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10752339","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142713900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Compared with conventional imaging methods, Fourier single-pixel imaging (FSPI) has efficient noise immunity, wide spectral coverage, non-local imaging ability and long imaging range. Leveraging FSPI for object detection holds promising applications. However, considering the imaging speed of FSPI, it is necessary to obtain the imaging scene information in the under-sampling condition. The quality of FSPI reconstructions with low sampling rate is low and utilizing low quality reconstruction results for object detection will lead to low detection accuracy. To address the challenges, a joint reconstruction-detection framework based on FSPI is proposed. The Spatial-Adaptive Reconstruction Network (SARN) is designed to rapidly reconstruct the low-sampling rate image to improve the image quality. The Mixed Spatial Pyramid Pooling Fast (MSPPF) and Deformable Convolution (DCN) are integrated into the object detection network to improve the detection performance. Through joint training strategy, the synergy between high-level and low-level vision tasks is strengthened, so as to further improve the detection accuracy. Numerical simulations and real-world experiments show that the proposed method not only improves the quality of FSPI reconstruction with low sampling rate, but also significantly improves the performance of object detection tasks.
{"title":"FSPI-R&D: Joint Reconstruction and Detection to Enhance the Object Detection Precision of Fourier Single-Pixel Imaging","authors":"Hancui Zhang;Haozhen Chen;Xu Yang;Zhen Yang;Long Wu;Yong Zhang;Jianlong Zhang","doi":"10.1109/JPHOT.2024.3495813","DOIUrl":"https://doi.org/10.1109/JPHOT.2024.3495813","url":null,"abstract":"Compared with conventional imaging methods, Fourier single-pixel imaging (FSPI) has efficient noise immunity, wide spectral coverage, non-local imaging ability and long imaging range. Leveraging FSPI for object detection holds promising applications. However, considering the imaging speed of FSPI, it is necessary to obtain the imaging scene information in the under-sampling condition. The quality of FSPI reconstructions with low sampling rate is low and utilizing low quality reconstruction results for object detection will lead to low detection accuracy. To address the challenges, a joint reconstruction-detection framework based on FSPI is proposed. The Spatial-Adaptive Reconstruction Network (SARN) is designed to rapidly reconstruct the low-sampling rate image to improve the image quality. The Mixed Spatial Pyramid Pooling Fast (MSPPF) and Deformable Convolution (DCN) are integrated into the object detection network to improve the detection performance. Through joint training strategy, the synergy between high-level and low-level vision tasks is strengthened, so as to further improve the detection accuracy. Numerical simulations and real-world experiments show that the proposed method not only improves the quality of FSPI reconstruction with low sampling rate, but also significantly improves the performance of object detection tasks.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"16 6","pages":"1-12"},"PeriodicalIF":2.1,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10750336","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To counter heterodyne measurements, correlation attacks, and known plaintext attacks, seed key refresh is critical to the security of a quantum noise stream cipher system. Integrated key distribution is an important means to reduce the deployment cost, as key exchange and public transmission are performed over the same channel. In this paper, we propose a novel method for integrated key distribution by optical steganography based on dither-remodulation in a bias controller of the Mach-Zehnder modulator. No extra wavelength or bandwidth is used for the stealth channel, which is transmitted together within the public channel. The concealing depth of the stealth signal reaches −36.2 dB, and its steganographic effect provides additional security, which further improves the overall security of the optical physical layer. The bidirectional stealth transmission can support light-weight temporary key exchange mechanism, combined with asymmetric encryption algorithm, to achieve high security and forward/backward security of seed keys. We experimentally demonstrate a real-time integrated key distribution via optical steganography in a QNSC system. The experimental results show that a real-time bidirectional stealth link is established at a rate of 1 kbps in a fiber transmission distance of 97 km for a public QNSC transmission at a rate of 32 Gbps, providing a seed key refresh frequency of over 1 Hz.
{"title":"Integrated Physical Layer Key Distribution by Optical Steganography in Quantum Noise Stream Cipher System","authors":"Yuanxiang Wang;Hanwen Luo;Tian Qiu;Linsheng Zhong;Xiaoxiao Dai;Qi Yang;Lei Deng;Deming Liu;Mengfan Cheng","doi":"10.1109/JPHOT.2024.3495834","DOIUrl":"https://doi.org/10.1109/JPHOT.2024.3495834","url":null,"abstract":"To counter heterodyne measurements, correlation attacks, and known plaintext attacks, seed key refresh is critical to the security of a quantum noise stream cipher system. Integrated key distribution is an important means to reduce the deployment cost, as key exchange and public transmission are performed over the same channel. In this paper, we propose a novel method for integrated key distribution by optical steganography based on dither-remodulation in a bias controller of the Mach-Zehnder modulator. No extra wavelength or bandwidth is used for the stealth channel, which is transmitted together within the public channel. The concealing depth of the stealth signal reaches −36.2 dB, and its steganographic effect provides additional security, which further improves the overall security of the optical physical layer. The bidirectional stealth transmission can support light-weight temporary key exchange mechanism, combined with asymmetric encryption algorithm, to achieve high security and forward/backward security of seed keys. We experimentally demonstrate a real-time integrated key distribution via optical steganography in a QNSC system. The experimental results show that a real-time bidirectional stealth link is established at a rate of 1 kbps in a fiber transmission distance of 97 km for a public QNSC transmission at a rate of 32 Gbps, providing a seed key refresh frequency of over 1 Hz.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"16 6","pages":"1-6"},"PeriodicalIF":2.1,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10750337","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-11DOI: 10.1109/JPHOT.2024.3496559
Yage Zhan;Kehan Li;Wenzhuo Zhang;Lirui Liu;Min Han;Zhaoyong Wang;Junqi Yang;Yifan Liu;Qing Ye
Earthquake early warning can effectively reduce the potential earthquake damage and is extremely strict to the sensor location and identification time. Distributed fiber acoustic sensing (DAS) is a novel seismic monitoring system with existing optical communication fiber as sensors and the passive seismic transducers are opt to densely deploy in harsh earthquake prone area, saving valuable time for earthquake to reach sensors. In order to shorten the earthquake identification time and increase the accuracy of earthquake identification at the same time, a fast earthquake identification method is proposed with DAS and DSR-Net (DAS Seismic Recognition Network) deep learning network. The signal time-frequency image samples are constructed to extract signal features, and DSR-Net is used for recognition. The feasibility is verified in natural earthquake monitoring, and the recognition accuracy of the first 5s seismic data is up to 88.29%. As the duration of the earthquake increases, the recognition accuracy reaches more than 93%. This method will be an important reference for earthquake early warning and natural disaster prevention.
{"title":"The DAS With Deep Neural Network Based on DSR-Net for Fast Earthquake Recognition","authors":"Yage Zhan;Kehan Li;Wenzhuo Zhang;Lirui Liu;Min Han;Zhaoyong Wang;Junqi Yang;Yifan Liu;Qing Ye","doi":"10.1109/JPHOT.2024.3496559","DOIUrl":"https://doi.org/10.1109/JPHOT.2024.3496559","url":null,"abstract":"Earthquake early warning can effectively reduce the potential earthquake damage and is extremely strict to the sensor location and identification time. Distributed fiber acoustic sensing (DAS) is a novel seismic monitoring system with existing optical communication fiber as sensors and the passive seismic transducers are opt to densely deploy in harsh earthquake prone area, saving valuable time for earthquake to reach sensors. In order to shorten the earthquake identification time and increase the accuracy of earthquake identification at the same time, a fast earthquake identification method is proposed with DAS and DSR-Net (DAS Seismic Recognition Network) deep learning network. The signal time-frequency image samples are constructed to extract signal features, and DSR-Net is used for recognition. The feasibility is verified in natural earthquake monitoring, and the recognition accuracy of the first 5s seismic data is up to 88.29%. As the duration of the earthquake increases, the recognition accuracy reaches more than 93%. This method will be an important reference for earthquake early warning and natural disaster prevention.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"16 6","pages":"1-6"},"PeriodicalIF":2.1,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10750371","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Optical coherence tomography (OCT) offers high-resolution imaging of internal finger structures, making it attractive for fingerprint recognition. Anti-spoofing research in OCT includes both static and liveness anti-spoofing. Liveness anti-spoofing is commonly detected by additional detection equipment or by extracting the liveness information from the OCT data. However, previous methods suffer from long data acquisition and computation times as well as low recognition accuracy. To address these problems, this paper proposes a fast liveness anti-spoofing method. The method requires no additional detection equipment, is fast in data acquisition and calculation, and has high computational accuracy. This study not only explores the method's effectiveness but also performs parameter analysis and optimization on multiple scales. In addition, this paper presents a comprehensive mathematical model that enables various types of OCT devices to calculate the optimal anti-counterfeiting parameters under different conditions. The experimental results show that this method can substantially improve the accuracy and real-time performance of anti-spoofing, and applies to various types of OCT systems, has a promising application in fingerprint identification and other medical diagnostic fields.
{"title":"Optimized Liveness Detection for Fast and Accurate Fingerprint Anti-Spoofing With Optical Coherence Tomography","authors":"Yilong Zhang;Heyou Yu;Haohao Sun;Yongbo Yao;Haixia Wang;Jian Liu;Yuanjie Dang;Ronghua Liang;Peng Chen","doi":"10.1109/JPHOT.2024.3495829","DOIUrl":"https://doi.org/10.1109/JPHOT.2024.3495829","url":null,"abstract":"Optical coherence tomography (OCT) offers high-resolution imaging of internal finger structures, making it attractive for fingerprint recognition. Anti-spoofing research in OCT includes both static and liveness anti-spoofing. Liveness anti-spoofing is commonly detected by additional detection equipment or by extracting the liveness information from the OCT data. However, previous methods suffer from long data acquisition and computation times as well as low recognition accuracy. To address these problems, this paper proposes a fast liveness anti-spoofing method. The method requires no additional detection equipment, is fast in data acquisition and calculation, and has high computational accuracy. This study not only explores the method's effectiveness but also performs parameter analysis and optimization on multiple scales. In addition, this paper presents a comprehensive mathematical model that enables various types of OCT devices to calculate the optimal anti-counterfeiting parameters under different conditions. The experimental results show that this method can substantially improve the accuracy and real-time performance of anti-spoofing, and applies to various types of OCT systems, has a promising application in fingerprint identification and other medical diagnostic fields.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"16 6","pages":"1-9"},"PeriodicalIF":2.1,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10750282","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142777728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This work elucidates the intricate interplay between the structural complexity of double absorber layered perovskite solar cells and the presence of defects, offering crucial insights for advancing the field of photovoltaics. The study systematically investigates the impact of a heterostructure featuring two perovskite absorber layers on device efficiency and highlights the challenges associated with defects. Our comprehensive analysis underscores the significance of a precisely tuned conduction band offset within the heterostructure, a parameter critical for achieving superior charge transport properties and overall device performance. Moreover, deliberate introduction of acceptor defects emerges as a strategic avenue for enhancing the structural integrity and photovoltaic output of the solar cell. This research contributes to the evolving understanding of defect engineering in perovskite solar cells, providing an intricate perspective on defect dynamics to improve device functionality. The identified parameters and insights presented in this study facilitate and guide the design and fabrication of advanced perovskite solar cells, emphasizing the importance of tailored heterostructure configurations and defect management strategies.
{"title":"Defect Density-Dependent Dynamics of Double Absorber Layered Perovskite Solar Cell","authors":"Jagupilla Lakshmi Prasanna;Ekta Goel;Amarjit Kumar","doi":"10.1109/JPHOT.2024.3494817","DOIUrl":"https://doi.org/10.1109/JPHOT.2024.3494817","url":null,"abstract":"This work elucidates the intricate interplay between the structural complexity of double absorber layered perovskite solar cells and the presence of defects, offering crucial insights for advancing the field of photovoltaics. The study systematically investigates the impact of a heterostructure featuring two perovskite absorber layers on device efficiency and highlights the challenges associated with defects. Our comprehensive analysis underscores the significance of a precisely tuned conduction band offset within the heterostructure, a parameter critical for achieving superior charge transport properties and overall device performance. Moreover, deliberate introduction of acceptor defects emerges as a strategic avenue for enhancing the structural integrity and photovoltaic output of the solar cell. This research contributes to the evolving understanding of defect engineering in perovskite solar cells, providing an intricate perspective on defect dynamics to improve device functionality. The identified parameters and insights presented in this study facilitate and guide the design and fabrication of advanced perovskite solar cells, emphasizing the importance of tailored heterostructure configurations and defect management strategies.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"16 6","pages":"1-10"},"PeriodicalIF":2.1,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10747762","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-06DOI: 10.1109/JPHOT.2024.3492209
Haitao Wei;Bowen Lv;Mengya Zhang;Yaping Yang;Tongcheng Yu;Kai Han
Violet phosphorus (VP) is a layered material developed in recent years with a tunable bandgap, high carrier mobility, and better thermal stability than its phosphorus allotrope, black phosphorus (BP). The bandgap of VP varies with thickness, ranging from 1.68 to 2.02 eV, with a high responsivity in the visible range. Combining lanthanide-doped upconversion nanoparticles (UCNPs) with VP and taking advantage of the energy transfer between them is a feasible strategy to achieve near-infrared (NIR) photodetection and expand the application scenarios of devices. In this work, we designed a novel strategy for NIR detection by simply combining UCNPs and VP using the spin-coating method. The prepared UCNPs/VP photodetector exhibits an excellent photoresponsivity of 2.8 mA/W and a high specific detectivity of 2.04×10 9 Jones (@ 980 nm, 2.8 mW/cm 2 , 10 V). Compared to the weak photoresponse of bare VP, the UCNPs/VP device shows a significant improvement in photoresponse in the near-infrared band. Additionally, we conducted the photoresponse characterization of the UCNPs/VP device at different temperatures, aiming to enhance its performance by adjusting the temperature. In conclusion, we found that the hybrid device performs better in high-temperature environment. This work provides new ideas and approaches for VP-based optoelectronic devices.
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