Optics express最新文献_第5页

High-precision beam tracking using liquid crystal spatial light modulator based on spatially partitioned time-interleaved phase updating. 基于空间分割时间交错相位更新的液晶空间光调制器高精度光束跟踪。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2026-04-20 DOI: 10.1364/OE.596887

Mingyang Sun, Duorui Gao, Mingze He, Chunhui Luo, Wen Shao, Wei Wang, Xiaoping Xie

{"title":"High-precision beam tracking using liquid crystal spatial light modulator based on spatially partitioned time-interleaved phase updating.","authors":"Mingyang Sun, Duorui Gao, Mingze He, Chunhui Luo, Wen Shao, Wei Wang, Xiaoping Xie","doi":"10.1364/OE.596887","DOIUrl":"https://doi.org/10.1364/OE.596887","url":null,"abstract":"The liquid crystal spatial light modulator (LCSLM) represents a promising solution for next-generation pointing, acquisition, and tracking (PAT) in space laser communication, owing to its non-mechanical steering, compact form factor, low power consumption, and programmable phase control capability. However, the inherent viscosity of liquid crystal molecules fundamentally limits the achievable response bandwidth of the device. Under high-frequency disturbances or rapid relative motion, this limitation frequently induces transient phase distortions and power fluctuations, potentially leading to link loss. To address these challenges, this paper proposes a spatially partitioned time-interleaved (SPTI) phase updating strategy. By dividing the optical aperture into sub-apertures with staggered updates, the proposed strategy disperses the concentrated transient errors typical of full-scale synchronized updates across spatiotemporal domains, thereby significantly enhancing the equivalent control bandwidth. We developed a spatiotemporal phase evolution model for the LCSLM and validated the approach through comprehensive simulations and experiments. Results demonstrate that, compared to the conventional updating strategy, the SPTI strategy improves the tracking accuracy by 40%, suppresses the received optical power fluctuations by 60%, and enables error-free 10 Gbps communication within a 10° angular range. These results confirm that the proposed strategy effectively alleviates the dynamic bandwidth limitations of liquid crystal devices and substantially extends their operational envelope in high-dynamic space laser communication scenarios.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 8","pages":"15440-15451"},"PeriodicalIF":3.3,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147818342","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

Reconfigurable plasmonic vortices on a flat metal film via symmetry control. 通过对称控制在平面金属薄膜上可重构的等离子体涡旋。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2026-04-20 DOI: 10.1364/OE.592038

Junkai Zhao, Hongbin Li, Zhongsheng Man

引用次数: 0

Impact of Al content in the n-AlGaN hole current confinement layer on the performance of GaN-based VCSELs. n-AlGaN空穴电流约束层中Al含量对gan基vcsel性能的影响。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2026-04-20 DOI: 10.1364/OE.590892

Xiantian Shi, Shun Gu, Yadan Zhu, Yifan Zhang, Zhigang Jia, Doudou Liang, Xiansheng Tang, Zhen Deng, Honggang Wang, Fengzhou Zhao, Lichun Zhang, Taiping Lu

{"title":"Impact of Al content in the n-AlGaN hole current confinement layer on the performance of GaN-based VCSELs.","authors":"Xiantian Shi, Shun Gu, Yadan Zhu, Yifan Zhang, Zhigang Jia, Doudou Liang, Xiansheng Tang, Zhen Deng, Honggang Wang, Fengzhou Zhao, Lichun Zhang, Taiping Lu","doi":"10.1364/OE.590892","DOIUrl":"https://doi.org/10.1364/OE.590892","url":null,"abstract":"The impact of Al content in the AlGaN hole current confinement layer (HCCL) on the optoelectronic properties of the GaN-based blue vertical-cavity surface-emitting lasers (VCSELs) is systematically studied through numerical simulation. As the Al content in HCCL increases from 0 to 0.25, the barrier height in the valence band for holes shows a significant increase in both vertical and lateral directions, which enhances hole confinement capability and suppresses hole leak outside the aperture. These contribute to the improvement of light output power (LOP) and wall-plug efficiency (WPE), as well as the reduction in threshold current. However, the hole leakage current remains almost unchanged with further increasing Al content to 0.3 in the HCCL. An in-depth analysis of the leakage path in VCSEL confirms that the leakage current is predominantly composed of holes that bypass the HCCL, as the current flowing across the HCCL is suppressed to nearly zero. As a result, further increasing the Al content to 0.3 yields only marginal improvements in LOP and WPE, and a reduction in threshold current. To achieve an optimal trade-off between the optical and electrical performances of the VCSEL, the optimum value of Al content in HCCL is around 0.25. This work has clarified the hole leakage paths and the effectiveness of tuning Al content in AlGaN HCCL for regulating hole transport, which provides theoretical guidance for the design and optimization of high-performance GaN-based VCSELs.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 8","pages":"14489-14498"},"PeriodicalIF":3.3,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147818751","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

Circular polarization dependent demultiplexing of molecular traps in intertwined Fibonacci spirals. 缠绕斐波那契螺旋中分子陷阱的圆偏振依赖解复用。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2026-04-20 DOI: 10.1364/OE.585613

Chung-Kai Tseng, Tang-Chun Liu, Chao-Yi Tai

引用次数: 0

Influence of zinc diffusion on the optical performance of heterogeneously integrated C-band lasers. 锌扩散对非均匀集成c波段激光器光学性能的影响。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2026-04-20 DOI: 10.1364/OE.585401

Michele Zenari, Biwei Pan, Jing Zhang, Delphine Neel, Joan Ramirez, Günther Roelkens

{"title":"Influence of zinc diffusion on the optical performance of heterogeneously integrated C-band lasers.","authors":"Michele Zenari, Biwei Pan, Jing Zhang, Delphine Neel, Joan Ramirez, Günther Roelkens","doi":"10.1364/OE.585401","DOIUrl":"https://doi.org/10.1364/OE.585401","url":null,"abstract":"In this work, we investigate the impact of contact annealing on the device performance of C-band laser diodes micro-transfer printed onto a silicon photonics platform. Annealing allows reducing the contact resistance of the devices but can also have an impact on the diffusion of dopants towards the active region, decreasing the quantum efficiency of the laser. This trade-off is studied in this paper. Through capacitance deep-level transient spectroscopy (C-DLTS) analysis, the decrease in performance upon annealing is associated with zinc impurities. These defects are believed to diffuse toward the active region, and as a result, act as non-radiative recombination centers. To eliminate the influence of the micro-transfer printing step, two sets of devices were compared. Both were fabricated from the same epitaxial wafer and underwent identical processing, except that one set was characterized before transfer-printing on the native substrate, whereas the other was measured after being transfer-printed onto silicon. C-DLTS measurements confirmed that the same process occurs on native InP substrates. Once the device contacts are annealed, constant current stress testing does not introduce further substantial threshold current variations.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 8","pages":"13882-13893"},"PeriodicalIF":3.3,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147818769","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

Doubled Z-axis scanning range and spot-quality enhancement in system-level integrated co-optimized transmissive 3D laser scanning systems. 系统级集成协同优化透射三维激光扫描系统中z轴扫描范围加倍和光斑质量增强。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2026-04-20 DOI: 10.1364/OE.588979

Yunli Yu, Jian Shao, Dongxin Gao, Wenyu Wang, Yuzhai Pan, Leimin Deng

引用次数: 0

Secure coherent optical communication via QKD-based parallel SHA-256 stream cipher with dual-randomized affine construction. 采用双随机仿射结构的基于qkd的并行SHA-256流密码保护相干光通信。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2026-04-20 DOI: 10.1364/OE.591403

Ying Zhang, Wenxiang Yao, Jiaqi Wang, Yumin Zhang, Fufei Pang, Tingyun Wang

{"title":"Secure coherent optical communication via QKD-based parallel SHA-256 stream cipher with dual-randomized affine construction.","authors":"Ying Zhang, Wenxiang Yao, Jiaqi Wang, Yumin Zhang, Fufei Pang, Tingyun Wang","doi":"10.1364/OE.591403","DOIUrl":"https://doi.org/10.1364/OE.591403","url":null,"abstract":"Although quantum key distribution (QKD) provides information-theoretically secure keys, a significant gap exists between its relatively low key generation rate and the high-speed demands of classical optical communication. To address this challenge, this paper proposes a stream cipher encryption scheme based on QKD and Secure Hash Algorithm 256 (SHA-256). Core to the scheme is an innovative group-wise dual-randomized affine construction. Integrated with configurable grouping and parallel processing, this mechanism applies a linear mapping defined by dynamic initial vectors (IV) and variable full-domain strides to each data group. This approach achieves deep orthogonalization of the hash input space while preserving architectural parallelism. Simulation results demonstrate that the scheme achieves high-strength security protection while ensuring real-time performance of the communication link. Specifically, statistical analysis confirms that the ciphertext exhibits high entropy and negligible autocorrelation, alongside high key sensitivity. The scheme expands the computational search space beyond the conventional 2256 bound, effectively countering pre-computation attacks.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 8","pages":"13703-13722"},"PeriodicalIF":3.3,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147818868","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

Corrections for accurate measurements of particle extinction in scattering media using collimated and diffuse illumination. 用准直和漫射照明对散射介质中粒子消光精确测量的校正。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2026-04-20 DOI: 10.1364/OE.591768

Cohen T V Nunes, Colton D Willhardt, Julien L Manin, Edouard Berrocal, Daniel R Guildenbecher

{"title":"Corrections for accurate measurements of particle extinction in scattering media using collimated and diffuse illumination.","authors":"Cohen T V Nunes, Colton D Willhardt, Julien L Manin, Edouard Berrocal, Daniel R Guildenbecher","doi":"10.1364/OE.591768","DOIUrl":"https://doi.org/10.1364/OE.591768","url":null,"abstract":"Light extinction is widely used to study particles in sprays, soot-forming combustion, and multiphase reactive flows. However, quantitative interpretation of extinction signals remains challenging when particles have a sufficiently large scattering albedo, meaning that incident photons are scattered much more than they are absorbed. This is especially true when experiments involve large apertures and diffuse illumination, resulting in the collection of a substantial portion of the scattered light. Here, an analytic model is developed that quantifies the fraction of single-scattered light collected in such a measurement. This model predicts the correction factor necessary to obtain the true optical depth from measured extinction. Model predictions are validated against experiments and Monte Carlo simulations, showing good agreement across the Rayleigh, Lorenz-Mie, and geometric regimes at low optical depths for both collimated and diffuse illumination schemes. Furthermore, in some regimes, model accuracy is shown to extend to high optical depths, and reasons therefor are discussed. For common measurements based on the diffuse back-illumination extinction imaging (DBI-EI) technique, the model proposed here establishes a practical foundation for quantitative interpretation of measured light extinction from scattering particles with substantially less computational cost and complexity compared to established Monte Carlo methods.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 8","pages":"14068-14085"},"PeriodicalIF":3.3,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147818881","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

Investigation of Goos-Hänchen shift in the structure of a photonic crystal containing graphene with a Cantor series arrangement. 含石墨烯康托级数排列的光子晶体结构Goos-Hänchen位移的研究。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2026-04-20 DOI: 10.1364/OE.590247

Miaomiao Zhao, Junfu Yang, Hao Ni, Xiaoling Chen, Hao Wu, Yufei Peng, Dong Zhao

{"title":"Investigation of Goos-Hänchen shift in the structure of a photonic crystal containing graphene with a Cantor series arrangement.","authors":"Miaomiao Zhao, Junfu Yang, Hao Ni, Xiaoling Chen, Hao Wu, Yufei Peng, Dong Zhao","doi":"10.1364/OE.590247","DOIUrl":"https://doi.org/10.1364/OE.590247","url":null,"abstract":"Conventional hyperbolic metamaterials are typically based on strictly periodic structures and can result in large Goos-Hänchen (GH) shift, but in our work, we achieve the hyperbolic characteristic in aperiodic photonic crystals containing graphene with a Cantor quasi-periodic sequence configuration, and subsequently induce giant GH shifts around the phase transformation point. We introduce the weight coefficient of layers in quasi-periodic photonic multilayers, and then the equivalent permittivity tensor presents a hyperbolic dispersion with a specific value of weight coefficient for the dielectric thickness. For a specified incident wavelength, the structure presents hyperbolic dispersion characteristics in the dispersion space by modulating the Fermi energy of graphene. By adjusting the Fermi energy, relaxation time, the number of graphene monolayers, and the thickness of the dielectric, near the phase transition from hyperbolic dispersion to elliptic dispersion, a huge change occurs in the reflection phase, thus achieving a giant GH shift, which can reach up to 12000λ. This research provides theoretical support for the design of highly sensitive angle displacement sensors based on the GH shift in quasi-periodic hyperbolic materials, and the optimal sensitivity of 6 × 106λ/deg. can be obtained.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 8","pages":"13986-13999"},"PeriodicalIF":3.3,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147818897","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

Reference standards for two-photon absorption cross-section and polarization ratio in the 440-630 nm wavelength range. 440 ~ 630 nm波长范围内双光子吸收截面和偏振比的参考标准。

IF 3.3 2区物理与天体物理

Optics express Pub Date : 2026-04-20 DOI: 10.1364/OE.587408

Charles W Stark, Ida Pinte, Meelis-Mait Sildoja, Helena Zneykus, Aleksander Trummal, Merle Uudsemaa, Juri Pahapill, Aleksander Rebane

引用次数: 0