Optics express最新文献_第3页

Precision molecular spectroscopy with a phase-locked terahertz quantum-cascade laser. 精确分子光谱与锁相太赫兹量子级联激光器。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-04-07 DOI: 10.1364/OE.553739

R Voigt, M Wienold, D Jayasankar, J Stake, X Lü, K Biermann, H W Hübers

引用次数: 0

Planar nonuniform and spatially dispersive metasurface as a substitute for optical system. 平面非均匀和空间色散超表面作为光学系统的替代品。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-04-07 DOI: 10.1364/OE.553758

Jeck Borne, Christopher Bouillon, Michel Piché, Simon Thibault

引用次数: 0

Generalized computational framework for phase image reconstruction in structured illumination digital holographic microscopy. 结构照明数字全息显微镜相像重建的广义计算框架。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-04-07 DOI: 10.1364/OE.543403

Sofía Obando-Vásquez, Raul Castaneda, Rene Restrepo, Carlos Trujillo, Ana Doblas

{"title":"Generalized computational framework for phase image reconstruction in structured illumination digital holographic microscopy.","authors":"Sofía Obando-Vásquez, Raul Castaneda, Rene Restrepo, Carlos Trujillo, Ana Doblas","doi":"10.1364/OE.543403","DOIUrl":"https://doi.org/10.1364/OE.543403","url":null,"abstract":"Correct demodulation and phase compensation are integral in digital holographic microscopy (DHM) with structured illumination (SI), i.e., SI-DHM, to reconstruct super-resolved phase images from raw SI-DHM holograms. The overall performance of the SI-DHM system depends heavily on the computational reconstruction framework utilized. This work presents a generalized reconstruction framework for SI-DHM that automatically demodulates the two laterally shifted object spectrums without prior knowledge of the phase shifts between the recorded holograms and automatically compensates for the linear phase term of each shifted object spectrum. The proposed framework reconstructs super-resolved phase images along one lateral direction with minimum inputs from the user, only requiring the two recorded phase-shifted holograms, the pixel size, and the source's wavelength. The framework's performance has been validated using simulated and experimental holograms recorded using an SI-DHM system for two different lateral modulation frequencies of the structured pattern, demonstrating its versatility and effectiveness in reconstructing super-resolved phase images.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 7","pages":"16454-16467"},"PeriodicalIF":3.2,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143984998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving efficiency of ghost imaging by tapping into the obtained data. 利用获得的数据，提高鬼影成像的效率。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-04-07 DOI: 10.1364/OE.559035

Chen Chang, Long-Kun Du, Shuai Sun, Wei-Tao Liu

引用次数: 0

Mitigation of inter-symbol interference in non-line-of-sight ultraviolet communication using a photon counting image sensor. 利用光子计数图像传感器减轻非视距紫外通信中的符号间干扰。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-04-07 DOI: 10.1364/OE.553542

Tao Shan, Nan He, Julian Cheng

{"title":"Mitigation of inter-symbol interference in non-line-of-sight ultraviolet communication using a photon counting image sensor.","authors":"Tao Shan, Nan He, Julian Cheng","doi":"10.1364/OE.553542","DOIUrl":"https://doi.org/10.1364/OE.553542","url":null,"abstract":"Scattering-based ultraviolet (UV) transmission is a crucial method for realizing non-line-of-sight (NLOS) optical communications. However, the inherent multipath characteristics of scattering channels can induce inter-symbol interference (ISI), significantly limiting signal transmission efficiency. To mitigate the effects of ISI on UV NLOS transmission, we propose a photon counting image sensor (PCIS) based receiver and the corresponding multiple scattering channel model. A photon counting reception mode for the PCIS has also been developed, incorporating two combining methods along with three types of counting-start instants that influence photon counting sampling. Simulation results reveal that the photon counting channels that account for ISI can be more accurately described as multipath channel models where the path with the maximum signal strength is not necessarily the shortest. Furthermore, the time-aligned equal gain selective combining method, when employed with a counting-start instant that maximizes photon counts in a single window, can concentrate a greater number of photons within one counting window, thereby substantially reducing the bit-error rate.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 7","pages":"15168-15186"},"PeriodicalIF":3.2,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143976318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Femtosecond laser melting upconversion nanoparticles for sub-micrometer optical patterning. 用于亚微米光学图形的飞秒激光熔化上转换纳米颗粒。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-04-07 DOI: 10.1364/OE.557532

Weizhao Gu, Simone Lamon, Min Gu, Qiming Zhang

引用次数: 0

Perturbation dimensional reduction theory assisted low complexity convolutional neural network equalizer for optical communications. 微扰降维理论辅助低复杂度卷积神经网络均衡器的光通信。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-04-07 DOI: 10.1364/OE.550530

Lu Han, Yongjun Wang, Haipeng Yao, Xingyuan Huang, Haifeng Yang, Qi Zhang, Xiangjun Xin

{"title":"Perturbation dimensional reduction theory assisted low complexity convolutional neural network equalizer for optical communications.","authors":"Lu Han, Yongjun Wang, Haipeng Yao, Xingyuan Huang, Haifeng Yang, Qi Zhang, Xiangjun Xin","doi":"10.1364/OE.550530","DOIUrl":"https://doi.org/10.1364/OE.550530","url":null,"abstract":"The integration of neural networks with perturbation theory has been recognized as a pivotal factor contributing to the enhancement of transmission efficiency in modern optical communication systems. Research focuses on balancing superior equalization performance against system complexity minimization. This paper presents a novel and efficient data dimensionality reduction compression methodology for developing low-complexity neural network-based equalizers intended to mitigate nonlinear impairments in optical fiber communication systems. Firstly, we propose a dimensionality reduction (DR) method exploiting the spatial symmetry of perturbation coefficients, enabling low-complexity DR feature map construction at the input end. Then, a complex-valued CNN (CvCNN) equalizer is then designed, utilizing single-channel complex-valued feature maps to preserve data characteristics while further reducing complexity. The effectiveness of the proposed equalizer is verified through numerical studies, and further performance comparisons and complexity analyses with other equalizers are conducted in a 20 GBaud PDM 64-QAM coherent optical transmission experimental system. The research and analysis are grounded in a fair performance comparison of Q-factors, accompanied by thorough analyses of time and space complexity under equivalent performance conditions. Finally, The DR feature map achieves an 82.64% reduction in effective feature units. When deployed in CvCNN, the equalizer reduces space and time complexity by 66.90% and 70.55%, respectively.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 7","pages":"15724-15741"},"PeriodicalIF":3.2,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143985528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Composition-controlled recovery time of SWIR (2-2.4 µm) GaSb-based SESAMs. 成分控制的SWIR（2-2.4µm）基于gasb的sesam恢复时间。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-04-07 DOI: 10.1364/OE.558108

Maximilian C Schuchter, Marco Gaulke, Nicolas Huwyler, Matthias Golling, Mircea Guina, Ursula Keller

{"title":"Composition-controlled recovery time of SWIR (2-2.4 µm) GaSb-based SESAMs.","authors":"Maximilian C Schuchter, Marco Gaulke, Nicolas Huwyler, Matthias Golling, Mircea Guina, Ursula Keller","doi":"10.1364/OE.558108","DOIUrl":"https://doi.org/10.1364/OE.558108","url":null,"abstract":"SEmiconductor Saturable Absorber Mirrors (SESAMs) have revolutionized the ultrafast laser industry. While SESAMs are well-established in the near-infrared regime, using GaAs-wafer epitaxy, there is an increasing interest for the short-wave infrared (SWIR) regime, for which SESAMs can be fabricated using the GaSb material system. Compared to GaAs-based SESAMs, the nonlinear response of GaSb absorbers has been reported to exhibit inherent ultrafast response and a different interplay between the response time and fabrication process. Here we report new advanced features of this interplay in a detailed study investigating the effects of lattice mismatch (LMM, e.g., strain) in the quantum wells (QWs), and barrier materials of SESAMs designed for a center wavelength between 2 and 2.4 µm. At 2 μm, SESAMs with ternary InGaSb, GaAsSb, and quaternary In(x)Ga(1-x)As(y)Sb(1-y) QWs embedded in GaSb were grown with varying levels of QW LMM, ranging from compressive strain (-1.7% LMM) to tensile strain (+0.9% LMM). We observed a strong dependence of the recovery time on the QW strain. While a maximum interband recovery time of 340 ps was measured for lattice matched QWs (-0.1% LMM), both compressively and tensilely strained QWs exhibit a shorter interband recovery time. Furthermore, a set of In0.27GaSb QW SESAMs embedded in AlxGa1-xAsSb barriers with different Al content have been grown. We observed that an increasing Al content in the barrier significantly slows down the interband recovery time. All findings are consistent for different heterostructures designed for operation at 2-2.4 µm.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 7","pages":"14750-14765"},"PeriodicalIF":3.2,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144011059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic graphical control of camouflage color with microwave/infrared stealth based on electromagnetic metastructures. 基于电磁元结构的微波/红外隐身伪装颜色的动态图形控制。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-04-07 DOI: 10.1364/OE.558179

Zhihui Yang, Yuhan Yang, Xiaotong Zhao, Xiaohang Wang, Chuang Sun, Chunlei Guo, Xixiang Su, Qun Hao

{"title":"Dynamic graphical control of camouflage color with microwave/infrared stealth based on electromagnetic metastructures.","authors":"Zhihui Yang, Yuhan Yang, Xiaotong Zhao, Xiaohang Wang, Chuang Sun, Chunlei Guo, Xixiang Su, Qun Hao","doi":"10.1364/OE.558179","DOIUrl":"https://doi.org/10.1364/OE.558179","url":null,"abstract":"Ground targets in complex environments demand adaptive camouflage that dynamically blends with the background. Conventional adaptive chromic materials often overlook radar wave absorption and infrared radiation reduction, compounded by rigidity constraints that hinder large-area deployments. This study presents a composite material with dynamic graphical control of camouflage color and microwave/infrared stealth capabilities enabled by electromagnetic metastructures. In the visible spectrum (380-760 nm), the material transitions between deep green, light green, earth yellow, and brown with a control voltage under 3 V and a response time of 25 seconds. A modular driving control circuit divides the material into 16 modules (4 × 4), allowing zoned color control, real-time pattern formation, and dynamic transformation. The material achieves broad-band microwave absorption from 8-18 GHz with at least -10 dB bandwidth of 6 GHz, and in the infrared band (8-14 µm), maintains an average emissivity below 0.4 and radiates 22.3°C cooler than the ground. These features enable effective microwave and infrared attenuation and dynamic optical control for various targets. By optimizing the film-forming process, the composite can be produced via screen printing and laser etching, facilitating low-cost, large-scale, flexible production. Its application via pasting or draping on target surfaces underscores its practical potential.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"33 7","pages":"15032-15043"},"PeriodicalIF":3.2,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144011042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

THz-TDS: extracting complex conductivity of two-dimensional materials via neural networks trained on synthetic and experimental data. THz-TDS：通过合成和实验数据训练的神经网络提取二维材料的复合电导率。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2025-04-07 DOI: 10.1364/OE.557580

Ben Beddoes, Nicholas Klokkou, Jon Gorecki, Patrick R Whelan, Peter Bøggild, Peter U Jepsen, Vasilis Apostolopoulos

引用次数: 0