Jiayuan Lin;Qi Yu;Meng Teng;Xinmin Ding;Detang Xiao;Wenbo Wan;Qiegen Liu
{"title":"Mean-Reverting Diffusion Model-Enhanced Scattering Imaging","authors":"Jiayuan Lin;Qi Yu;Meng Teng;Xinmin Ding;Detang Xiao;Wenbo Wan;Qiegen Liu","doi":"10.1109/JPHOT.2025.3584754","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3584754","url":null,"abstract":"Scattering media disrupt the rectilinear propagation of light, significantly degrading the resolution and clarity of optical imaging systems. Current scattering imaging techniques usually focus on simple targets and present limitations in imaging quality and reconstruction efficiency. To address these limitations, a mean-reverting diffusion model-enhanced scattering imaging (MRDS) is proposed. During training, prior information is extracted by diffusing the training data into an intermediate state with stable Gaussian noise. Reconstruction begins with low-quality images from physically-guided inversion, followed by iterative solving of reverse-time stochastic differential equations via the Euler-Maruyama method, integrating learned prior information to efficiently reconstruct high-quality images. Simulative and experimental validations demonstrate that MRDS outperforms traditional methods in reconstructing images with fewer artifacts and enhanced detail clarity. Quantitative metrics further demonstrates excellent reconstruction performance, with average metrics reaching 41.19 dB for PSNR, 0.99 for SSIM and 0.0085 for LPIPS. The reconstruction time per image is 2.19 seconds, representing a 44.2-fold acceleration compared to conventional methods. The proposed method achieves high-quality reconstructions of complex targets in a significantly shorter time, which dramatically boosts the efficiency of scattering imaging.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 4","pages":"1-8"},"PeriodicalIF":2.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11061784","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144641079","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}
{"title":"Comparisons of Optical Properties of Glucose Sensing by Mueller Matrix Polarimetry Using Infrared and Visible Wavelengths","authors":"Yu-Ren Chen;Yu-Lung Lo;Wei-Chun Hung","doi":"10.1109/JPHOT.2025.3584221","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3584221","url":null,"abstract":"A Mueller matrix polarimetry system with 1650 nm wavelength is developed to extract the mean absorbance and anisotropic properties of turbid media as an enabling technology for non-invasive glucose sensing. It shows that the mean absorbance (<inline-formula><tex-math>${{A}_e}$</tex-math></inline-formula>), depolarization index (<italic>Δ</i>), and optical rotation (<italic>γ</i>) vary linearly with the glucose concentration. These findings highlight the interdependence of these parameters and their significance in characterizing the optical properties of glucose. Moreover, when conducting human testing, it was observed that glucose exhibited a notable time delay at the 532 nm wavelength instead of the 1650 nm wavelength. Furthermore, it was observed that the absorption of glucose at 532 nm is lower than at 1650 nm. Regarding the optical rotation, the response at 1650 nm is much clearer than that at 532 nm. This can be explained by the fact that the optical rotation reaction at 532 nm is more susceptible to interference from other interfering substances than at 1650 nm, leading to cancellation of each other out. As a result, the mean absolute relative deviation (MARD) value for the polarimetric system at 1650 nm wavelength is 1.8334%, and the correlation coefficient (R<sup>2</sup>) value for 1650 nm wavelength is 0.97629. It is found that the MARD and R<sup>2</sup> values for the polarimetric system at 532 nm wavelength, developed by the same group, have poorer results in terms of system accuracy and the linear relationship of the model, respectively. These observations suggest that using 1650 nm is more effective in accurately predicting the behavior of glucose in human tests.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 4","pages":"1-9"},"PeriodicalIF":2.1,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11059274","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144646506","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}
Lei Chen;Lei Zhu;Heng Du;Xiangyu Wang;Shiyang Shen;Yihao Wang;Shan Zhao;Xiaodong Wang
{"title":"Pointing Acquisition and Tracking System for Free Space Optical Communication Based on Integrated Optical Phased Array","authors":"Lei Chen;Lei Zhu;Heng Du;Xiangyu Wang;Shiyang Shen;Yihao Wang;Shan Zhao;Xiaodong Wang","doi":"10.1109/JPHOT.2025.3582266","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3582266","url":null,"abstract":"With proliferation of low-earth-orbit satellite (LEOs) constellations, air-to-space laser communications have the potential to realize aircraft broadband Internet services due to its high speed and low latency. A major challenge in aircraft to LEOs laser link is the fast scanning, high-bandwidth pointing acquisition tracking (PAT) approach to achieve rapid link establishment and handover as well as to compensate for errors caused by vibrations of the aircraft platform. In this paper, a PAT system based on integrated optical phased array (OPA) and four quadrant detector (QD) is demonstrated. Rapid azimuth beam scanning is achieved by controlling the OPA’s 512 thermal phase shifters, while elevation scanning is carried out by adjusting the laser’s wavelength. The arrival angle of the incident beacon is measured by QD and used to adjust the emission direction through FPGA. The experiment shows that the beam steering rise time is less than 60 μs in azimuth and 46 μs in elevation, while the pointing accuracy is <0.05°>2.5 kHz. The PAT system has low complexity, small size, mechanical-free beam agility steering, and high tracking bandwidth capability.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 4","pages":"1-8"},"PeriodicalIF":2.1,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11048403","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144536569","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}
{"title":"Ultrawide Dynamic Bandwidth Modulation of an Antiresonant Nanoweb Hollow-Core Fiber","authors":"Ricardo E. da Silva;Cristiano M. B. Cordeiro","doi":"10.1109/JPHOT.2025.3581681","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3581681","url":null,"abstract":"We experimentally demonstrate an acoustically modulated antiresonant nanoweb hollow-core fiber (N-HCF) for the first time. The N-HCF contains two off-center air cores with a diameter difference of 5 μm, separated by a nanoweb of silica. We analytically simulate the influence of the N-HCF’s core diameter, cladding wall, and nanoweb thicknesses on the confinement losses, effective indices, and beatlengths of the guided fundamental (HE11) and higher-order modes (TE01, TM01), from 750 to 1200 nm. The phase-matching of the acoustic waves and modal beatlengths is also estimated and discussed. The fabricated 3.6 cm long acousto-optic device modulates record-wide bandwidths (up to 450 nm) while providing high modulation depths (up to 8 dB) at low drive voltages (10 V). Simulated and measured results provide useful insights for designing, modeling, and characterizing the N-HCF’s transmission spectrum and modulation performance. These achievements lead to highly efficient, compact, and fast all-fiber sensors and modulators promising for application in pulsed fiber lasers.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 4","pages":"1-6"},"PeriodicalIF":2.1,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11045409","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144550521","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}
Zhiwei Zhang;Zhiyong Yang;Wei Cai;Mingdi Zhang;Xiaowei Wang
{"title":"A Phenomenological Polarized Spectral Bidirectional Reflectance Distribution Function Based on Spectral and Spatial Dependence","authors":"Zhiwei Zhang;Zhiyong Yang;Wei Cai;Mingdi Zhang;Xiaowei Wang","doi":"10.1109/JPHOT.2025.3581285","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3581285","url":null,"abstract":"The polarized bidirectional reflectance distribution function (pBRDF) model not only quantifies radiation intensity, but also effectively describes the polarization characteristics of the scattered light on the target surface. In this paper, the spectral and spatial dependence of specular and diffuse reflection of four coating fabric samples are analyzed, which are defined as the dependence on wavelength and observation positions. The analysis shows that the specular reflection has no spectral and a strong spatial dependence; the diffuse reflection has a strong spectral and weak spatial dependence. Based on the analysis, a phenomenological polarized spectral bidirectional reflectance distribution function (pSBRDF) is proposed, which further divides the diffuse reflection into directional diffuse reflection with both weak spectral and spatial dependence, and ideal diffuse reflection with a strong spectral and no spatial dependence. Then, the degree of linear polarization (DoLP) model is derived, when the incident light is natural light. The comparison of measured and modeled results shows that the model can accurately describe the spectral and spatial dependence of reflection and polarization of four samples, which provides theoretical support for analyzing the polarized spectral characteristics of targets.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 4","pages":"1-15"},"PeriodicalIF":2.1,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11045076","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144597763","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}
{"title":"Thermo-Optical Modulator Based on VO2 and Graphene Plasmonics","authors":"Sareh Vatani;Vahid Faramarzi;Jeongwon Park","doi":"10.1109/JPHOT.2025.3581488","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3581488","url":null,"abstract":"This paper details the design and theoretical analysis of a novel thermo-optical modulator that leverages the unique phase transition characteristics of vanadium dioxide (VO<sub>2</sub>) and the plasmonic properties of graphene. Employing a combination of transmission and reflection mode structures, the study explores four configurations designed to optimize modulation depth and minimize insertion loss. The analysis conducted using COMSOL Multiphysics with the finite element method (FEM) highlights the significant influence of geometrical parameters on the modulator’s performance. The specific attention to the interaction between VO<sub>2</sub>’s phase transition at critical temperatures and graphene’s conductivity adjustment provides insights into the dynamic control of optical signals in the mid-infrared spectrum.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 4","pages":"1-8"},"PeriodicalIF":2.1,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11043160","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144606216","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}
{"title":"Melanopic Contribution of Display Image to Alertness, Attention, Brightness Perception, and Visual Fatigue","authors":"Nianfang Zhu;Yan Tu;Lili Wang;Yunyang Shi","doi":"10.1109/JPHOT.2025.3580661","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3580661","url":null,"abstract":"The melanopic contribution to visual and non-visual effects has garnered growing concern, particularly in lighting research. However, its impacts caused by display images remain understudied. This research investigated the influence of melanopic luminance of display images on visual effects like brightness perception and visual fatigue, as well as non-visual effects such as alertness and attention based on a 65-inch four-primary display system. A 300 lx photopic environment was adopted to ensure rod saturation. The metameric images were modulated at two melanopic luminance levels (higher and lower). A multimodal assessment, including subjective brightness ratings, Karolinska Sleepiness Scale (KSS) evaluations, reaction time of Psychomotor Vigilance Task (PVT), d2 test of attention performance metrics, eye movement parameters, and visual function parameters was applied. The results showed that images with higher melanopic luminance level elicited longer fixation duration as well as fewer blinks and fixations, indicating improved attention. It was also supported by better d2 test performance at higher melanopic luminance level. Further, the difference in eye movement parameters between the two melanopic luminance levels showed that not only the Michelson contrast of the melanopic luminance levels, but also the melanopic luminance value itself played an important role. Moreover, a smaller increase in reaction time at higher melanopic luminance level implied heightened alertness, whereas the greater reduction in accommodation and convergence parameters indicated more pronounced visual fatigue. Subjective evaluation revealed that images with higher melanopic luminance level appeared brighter, supported by smaller pupil area.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 4","pages":"1-13"},"PeriodicalIF":2.1,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11039146","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144519267","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}
{"title":"Large Bandwidth Visible Electro-Optic Modulator for Data Transmission","authors":"K. Huang;X. Y. Ying;L. J. Yin;H. Hung","doi":"10.1109/JPHOT.2025.3580350","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3580350","url":null,"abstract":"We report the development of the world’s first single-mode optical fiber-coupled, fully packaged visible-wavelength electro-optic modulator. The device was experimentally characterized at representative wavelengths within the visible spectrum, including 520 nm, 633 nm, and 680 nm, demonstrating its broadband modulation capability. At a wavelength of 633 nm, the modulator exhibits a measured insertion loss of 7.6 dB, an extinction ratio of 27 dB, and a 3 dB bandwidth of 31.5 GHz. Digital data transmission was successfully demonstrated on the modulator, with a data rate of 12 Gbs<sup>−1</sup> and RF drive voltage of only 2 V peak-to-peak voltage, the bit error rate (BER) was measured to be less than 4.2 × 10<sup>−7</sup>.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 4","pages":"1-5"},"PeriodicalIF":2.1,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11037457","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144519428","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}
{"title":"Speckle Theory for Arbitrary Wavefront Illumination in Free-Space Surface Scattering","authors":"Qiyong Xu;Janan Zhou;Yipeng Mo;Zichun Le","doi":"10.1109/JPHOT.2025.3580173","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3580173","url":null,"abstract":"Speckle has been shown to cause significant degradation to the imaging quality of laser imaging systems. However, in certain complex imaging environments, it can also act as an effective information carrier. Therefore, accurate characterization of speckle is imperative. In this study, a speckle characterization theoretical model, which describes the features of speckle at arbitrary wavefront illumination in a free-space surface scattering optical path, is developed and experimentally verified. The current study elucidates the combined effect of illumination wavefront and laser wavelength on speckle contrast, further refining the statistical theory of speckle. The findings have potential applications in the prediction of speckle characteristics or environmental parameters, and are primarily relevant to non-imaging optics-related fields.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 4","pages":"1-7"},"PeriodicalIF":2.1,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11037532","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144519429","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}
Yunke Sun;Yifei Xie;Xiaotong Yan;Xu Xing;Pengcheng Hu
{"title":"Phase Response Identification of Photodetectors in High-Speed Interferometry Using Photoelectric Pseudorandom Signals","authors":"Yunke Sun;Yifei Xie;Xiaotong Yan;Xu Xing;Pengcheng Hu","doi":"10.1109/JPHOT.2025.3579506","DOIUrl":"https://doi.org/10.1109/JPHOT.2025.3579506","url":null,"abstract":"Dynamic accuracy and synchronization of high-speed interferometry are crucial for advanced manufacturing, semiconductor fabrication, and dynamic metrology, where asynchronous errors introduced by the nonlinear phase responses of photodetectors can severely degrade the measurement performance. The complex cross-physical processes make the phase responses of photodetectors challenging. Owing to their bandwidth, resolution, and test deviation limitations, the existing methods are not applicable to interferometric photodetectors. In this study, we employ a commonly available small form-factor pluggable module to generate optical pseudorandom signals as a photodetector’s excitation signals. Through correlation operations and phase spectrum analysis, the phase response of a photodetector with a 10-MHz bandwidth is identified with a model reliability of 90% and an uncertainty of 0.50° (k = 2). In practical applications, the identified phase response can help an interferometer suppress asynchronous errors to the sub-nm level within a maximum speed of 1.58 m/s. Comparative experiments verify the accuracy of the identified results and highlight substantial improvements in test precision, frequency resolution, practicality, and universality over existing methods.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":"17 4","pages":"1-10"},"PeriodicalIF":2.1,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11034693","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144536571","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}