Optics express最新文献_第2页

Manipulation of the symmetry of localized terahertz field in an AlGaN/GaN high-electron-mobility transistor integrated in a waveguide. 集成在波导中的AlGaN/GaN高电子迁移率晶体管中局域太赫兹场对称性的操纵。

IF 3.4 2区物理与天体物理

Optics express Pub Date : 2026-07-27 DOI: 10.1364/OE.600020

Zhu You, Boyang Xu, Xinxing Li, Jiandong Sun, Chenyang Qin, Lanyong Xiang, Hanze Chen, Chenyang Jin, Yang Shangguan, Hua Qin

{"title":"Manipulation of the symmetry of localized terahertz field in an AlGaN/GaN high-electron-mobility transistor integrated in a waveguide.","authors":"Zhu You, Boyang Xu, Xinxing Li, Jiandong Sun, Chenyang Qin, Lanyong Xiang, Hanze Chen, Chenyang Jin, Yang Shangguan, Hua Qin","doi":"10.1364/OE.600020","DOIUrl":"https://doi.org/10.1364/OE.600020","url":null,"abstract":"A terahertz wave coupled to a field-effect transistor is usually strongly localized in the gated electron channel. While a strongly localized and asymmetrically distributed terahertz field is welcomed to induce a direct-current (DC) photocurrent and hence helps to improve the sensitivity of homodyne detection, it limits the heterodyne detection sensitivity since the shot noise induced by the DC photocurrent increases with the local oscillator (LO) power. Therefore, the localized field distribution must be carefully tailored to maximize the heterodyne mixing efficiency while minimizing the homodyne mixing of the LO signal. This paper reports the manipulation of the symmetry of a localized terahertz field in a waveguide-coupled AlGaN/GaN high-electron-mobility transistor (HEMT) to improve the heterodyne detection sensitivity in the 340 GHz band. Simulation and experimental results demonstrate that both heterodyne and homodyne mixing are strongly localized at the ends of the gated electron channel; the heterodyne mixing signals are in phase, while the localized homodyne mixing signals (DC current) are out of phase. By regulating the symmetry of the localized terahertz field distributions excited by the radio frequency (RF) terahertz signal and the LO terahertz signal, a fairly symmetric distribution of the LO field is achieved to suppress the DC homodyne current induced by the LO signal, thereby effectively lowering the overall shot noise. The overall detector noise is elevated by only 2 dB when the LO power is increased by 20 dB into saturation. While the responsivity is kept as low as 6.7 mA/W at 336 GHz for the LO signal, the homodyne responsivity and the heterodyne noise-equivalent power (NEP) for the RF signal are maintained at 72 mA/W and -146 dBm/Hz, respectively.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 15","pages":"27318-27330"},"PeriodicalIF":3.4,"publicationDate":"2026-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148758936","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

Topology reconfigurable photonic reservoir computing with multiple optical feedback loops. 具有多光反馈回路的拓扑可重构光子库计算。

IF 3.4 2区物理与天体物理

Optics express Pub Date : 2026-07-27 DOI: 10.1364/OE.606877

Liyue Zhang, Wenbo Zeng, Songsui Li, Wei Pan, Lianshan Yan, Bin Luo, Xihua Zou

引用次数: 0

Photometric parameter inversion and nonlinearity characterization of infrared focal plane arrays based on flat-field data. 基于平场数据的红外焦平面阵列光度参数反演及非线性表征。

IF 3.4 2区物理与天体物理

Optics express Pub Date : 2026-07-27 DOI: 10.1364/OE.597714

Qiyao Wang, Yuanjie Zhang, Zhuoyue Hu, Peishan Song, Fansheng Chen

{"title":"Photometric parameter inversion and nonlinearity characterization of infrared focal plane arrays based on flat-field data.","authors":"Qiyao Wang, Yuanjie Zhang, Zhuoyue Hu, Peishan Song, Fansheng Chen","doi":"10.1364/OE.597714","DOIUrl":"https://doi.org/10.1364/OE.597714","url":null,"abstract":"In infrared time-domain astronomy and high-precision radiometric measurements, the photometric accuracy of infrared focal plane arrays (IRFPAs) is limited by the coupled effects of non-ideal factors such as gain bias, response nonlinearity, and spatial correlation. The conventional photon transfer curve (PTC) method cannot adequately characterize variance redistribution and nonlinear modulation, which limits the accuracy of key parameter extraction. To address this issue, this work proposes a physics-driven parameter inversion method based on flat-field data. A unified forward simulation model is constructed, in which photon shot-noise propagation, inter-pixel spatial correlation, and signal-dependent response nonlinearity are incorporated into a single framework. Under a unified statistical convention, statistical features including the central variance, the local covariance sum, and the spatial-correlation structure are jointly extracted, and a closed-loop parameter inversion procedure is established to enable the joint identification of gain, nonlinearity, and spatial-correlation parameters. Experimental results from a short-wave infrared (SWIR) detector show that the proposed method reproduces the measured PTC curve with a residual below 2%, captures the key spatial statistical features well, effectively suppresses systematic bias in photometry on real star-field images, and limits the relative prediction error of the core variance statistics to within 3.2% in cross-date prediction tests. These results indicate that the proposed framework provides a feasible technical approach for high-precision photometric characterization and ground calibration of non-ideal infrared detectors.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 15","pages":"27536-27556"},"PeriodicalIF":3.4,"publicationDate":"2026-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148760481","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

Influence of upper ocean bubbles on blue-green laser uplink cross-media transmission. 上层海洋气泡对蓝绿激光上行跨介质传输的影响。

IF 3.4 2区物理与天体物理

Optics express Pub Date : 2026-07-27 DOI: 10.1364/OE.603870

Ruiman Yuan, Tinglu Zhang, Yi Xue, Cong Li

{"title":"Influence of upper ocean bubbles on blue-green laser uplink cross-media transmission.","authors":"Ruiman Yuan, Tinglu Zhang, Yi Xue, Cong Li","doi":"10.1364/OE.603870","DOIUrl":"https://doi.org/10.1364/OE.603870","url":null,"abstract":"Laser cross-media transmission through seawater, the air-sea interface, and atmospheric channels experiences various effects, including spatial and temporal dispersion arising from intrinsic laser divergence and medium scattering, and received power reduction induced by medium absorption. These effects result in a lower signal-to-noise ratio and a limited maximum signal bandwidth. Consequently, channel loss is closely related to the channel transmission characteristics. This paper employs the Monte Carlo simulation method to systematically investigate the effects of upper ocean bubbles on uplink cross-media laser transmission under various conditions. The optical properties of upper ocean bubbles are determined by the latest bubble size distribution model based on Mie scattering theory. The influence of bubbles on laser transmission characteristics is examined through changes in angle of arrival (AOA) distribution, spot intensity distribution, and power loss, which vary with water quality, depth, and wind speed. The results indicate that high-concentration bubbles induce changes in the optical properties of the upper ocean water, thereby exerting a significant influence on laser transmission under high wind speed conditions in clear, shallow waters. For instance, the presence of bubbles increases the spot size by 30% and reduces the received power by 4 dB at a wind speed of 18 m/s. Furthermore, the influence of bubbles on laser transmission characteristics exhibits complex and non-monotonic behavior that varies with water quality and depth conditions. The results reveal the effects of bubbles on uplink cross-media laser transmission under various conditions, quantitatively assessing the impacts on key parameters, such as laser AOA, spot size, and power loss induced by upper ocean bubbles. These findings can provide a solid foundation for the development of advanced blue-green laser-based cross-media wireless communication systems.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 15","pages":"28138-28163"},"PeriodicalIF":3.4,"publicationDate":"2026-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148760949","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

Secure IM-DD transmission via asymmetric key management and cascaded Josephus-Latin square encryption. 通过非对称密钥管理和级联Josephus-Latin square加密安全IM-DD传输。

IF 3.4 2区物理与天体物理

Optics express Pub Date : 2026-07-27 DOI: 10.1364/OE.606652

Peng Qin, Jiahao Huo, Haolin Bai, Chenglin Bai, Keping Long

{"title":"Secure IM-DD transmission via asymmetric key management and cascaded Josephus-Latin square encryption.","authors":"Peng Qin, Jiahao Huo, Haolin Bai, Chenglin Bai, Keping Long","doi":"10.1364/OE.606652","DOIUrl":"https://doi.org/10.1364/OE.606652","url":null,"abstract":"This paper proposes a secure encryption scheme for intensity modulation direct detection (IM-DD) data center interconnects employing 4-level pulse amplitude modulation (PAM4). The scheme integrates asymmetric key management with chaos-based symbol-level encryption to enhance physical-layer security. For master key management, a non-interactive Goldwasser-Micali (GM) based distribution is introduced for short-key scenarios. An interactive Elliptic Curve Diffie-Hellman (ECDH) based agreement with forward secrecy is adopted to support longer keys in high-security deployments. The master key is dynamically updated per frame, from which session keys are derived via a hash function to drive chaotic systems for generating chaotic sequences. For symbol-level encryption, we propose a cascaded architecture combining a chaos-driven variable-step Josephus permutation for symbol scrambling with Latin square encryption for symbol value substitution. Experimental results at 100 and 140 Gbit/s over 2 km standard single-mode fiber show that the bit error rate (BER) performance of the encrypted PAM4 signal is basically comparable to that of the unencrypted link, achieving receiver sensitivities of approximately -6.7 dBm and -5.8 dBm, respectively, at the 7% forward error correction threshold. For an eavesdropper without the correct key, the recovered data has a BER of approximately 0.5, rendering the extraction of any meaningful information impossible. Therefore, the proposed encryption scheme enhances physical layer security without requiring dedicated optical hardware or incurring any additional performance penalty.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 15","pages":"27053-27068"},"PeriodicalIF":3.4,"publicationDate":"2026-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148761086","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

Engineering strong coupling in ultra-compact photonic crystal/2D material platforms. 超紧凑光子晶体/二维材料平台的工程强耦合。

IF 3.4 2区物理与天体物理

Optics express Pub Date : 2026-07-27 DOI: 10.1364/OE.601866

Eleonora P Kraus, Jamie M Fitzgerald, Carlos Maciel-Escudero, Ermin Malic

{"title":"Engineering strong coupling in ultra-compact photonic crystal/2D material platforms.","authors":"Eleonora P Kraus, Jamie M Fitzgerald, Carlos Maciel-Escudero, Ermin Malic","doi":"10.1364/OE.601866","DOIUrl":"https://doi.org/10.1364/OE.601866","url":null,"abstract":"Sub-wavelength-thick photonic crystal (PhC) slabs coupled to 2D excitonic materials, such as transition metal dichalcogenides (TMDs), are a promising platform for highly tunable, room-temperature, on-chip optoelectronic devices. Unlike conventional Fabry-Pérot microcavities, these compact open cavities exhibit non-trivial electric field profiles, leading to spatially distinct regions of weak and strong coupling with excitons within the PhC unit cell. Using coupled-mode theory and rigorous solutions to Maxwell's equations, we investigate how the PhC geometry can be used to control these coexisting exciton/polariton contributions and tailor the resulting optical spectra. For large filling factors, i.e., small air gaps, we show that PhC polaritons can be modeled as dark waveguide modes brightened via the periodicity of the PhC slab. Furthermore, by spatially patterning the TMD monolayer based on the local field intensity, we reveal the simultaneous presence of excitons in both the weak and strong coupling regimes. Overall, this work provides fundamental insights into the strong light-matter coupling regime in structured photonic environments, offering a pathway to design and optimize metal-free, ultra-compact polaritonic devices.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 15","pages":"27977-27990"},"PeriodicalIF":3.4,"publicationDate":"2026-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148761234","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

Absolute phase fingerprint matching in fringe projection profilometry based on chirped phase-shifted fringes. 基于啁啾相移条纹投影轮廓术的绝对相位指纹匹配。

IF 3.4 2区物理与天体物理

Optics express Pub Date : 2026-07-27 DOI: 10.1364/OE.606815

Hongyi Zeng, Haisen Yuan, Jie Wang, Hao Xing, Feng Tang, Wei Chen, Renjun Peng, Huimin Yue, Yong Liu

{"title":"Absolute phase fingerprint matching in fringe projection profilometry based on chirped phase-shifted fringes.","authors":"Hongyi Zeng, Haisen Yuan, Jie Wang, Hao Xing, Feng Tang, Wei Chen, Renjun Peng, Huimin Yue, Yong Liu","doi":"10.1364/OE.606815","DOIUrl":"https://doi.org/10.1364/OE.606815","url":null,"abstract":"Absolute phase computation is critical to fringe projection profilometry, yet temporal phase unwrapping requires additional patterns to encode absolute fringe order, degrading measurement efficiency. Spatial phase unwrapping eliminates additional patterns but yields only relative phase, making absolute height recovery impossible for isolated or discontinuous objects. To address this limitation, we propose an absolute phase fingerprint matching method based on chirped phase-shifted fringes. A set of chirped fringes is constructed by encoding absolute fringe order information directly into the fringe period such that the phase curvature varies monotonically. After spatial phase unwrapping, the relative phase of each isolated region is fingerprint matched to the global absolute phase. The unique curvature fingerprint enables precise regional localization within the global absolute phase space. Experimental results: plane RMS error of 0.0288 mm, standard sphere radius error of 0.0542 mm (relative error 0.0028%), and step height error of 0.0167 mm. These results demonstrate that the proposed chirped fringes achieve 3D measurement of isolated or discontinuous objects with accuracy comparable to the three-frequency heterodyne method, while reducing projected fringes from 12 to 4.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 15","pages":"27069-27080"},"PeriodicalIF":3.4,"publicationDate":"2026-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148761572","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 modulation method for super-resolution wavefront reconstruction of a plenoptic sensor. 全光传感器超分辨波前重建的动态调制方法。

IF 3.4 2区物理与天体物理

Optics express Pub Date : 2026-07-27 DOI: 10.1364/OE.568512

Haodi Mao, Zhenzhou Wang, Jin Guo, Junfeng Shao

引用次数: 0

Hybrid compensation method for testing large-aperture low-sag freeform mirrors. 大口径低凹陷自由曲面反射镜检测的混合补偿方法。

IF 3.4 2区物理与天体物理

Optics express Pub Date : 2026-07-27 DOI: 10.1364/OE.587370

Hongshi Li, Qiang Cheng, Zhuofei Ding, Longxiang Li, Jia Li, Yushan Han, Donglin Xue, Xuejun Zhang

{"title":"Hybrid compensation method for testing large-aperture low-sag freeform mirrors.","authors":"Hongshi Li, Qiang Cheng, Zhuofei Ding, Longxiang Li, Jia Li, Yushan Han, Donglin Xue, Xuejun Zhang","doi":"10.1364/OE.587370","DOIUrl":"https://doi.org/10.1364/OE.587370","url":null,"abstract":"A computer-generated hologram (CGH) is a high-precision method for testing complex surfaces. However, its applicability is limited by the aperture constraints of the fabrication equipment, rendering it challenging to effectively measure large-aperture, high-precision freeform mirrors. In this study, we propose a hybrid compensation approach combining CGH and a spherical mirror for testing large-aperture low-sag freeform mirrors. By introducing a virtual equivalent surface, we developed a hybrid computational method to calculate the CGH phase function. An interferometric data-processing model was established by incorporating mapping distortion correction, surface error reconstruction, and spherical mirror error removal. Experimental validation was performed on a rounded rectangular off-axis freeform mirror with a clear aperture of 698 mm × 210 mm, and comparative measurements were conducted using Dutch United Instruments. Root mean square density analysis shows that the hybrid compensation method achieves a low-frequency measurement accuracy of 3.6 nm root mean square (RMS) and a clear aperture surface measurement accuracy of 8.3 nm RMS. This method enables high-precision testing of large-aperture, low-sag freeform surfaces, and the spherical mirror compensator demonstrates a degree of general applicability.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 15","pages":"28478-28495"},"PeriodicalIF":3.4,"publicationDate":"2026-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148761802","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

Phase-locked antimonide diode laser array with Talbot cavity. 塔尔博特腔锁相锑化二极管激光阵列。

IF 3.4 2区物理与天体物理

Optics express Pub Date : 2026-07-27 DOI: 10.1364/OE.608969

Enquan Zhang, Jianmei Shi, Yihang Chen, Juntian Cao, Zhengqi Geng, Haoran Wen, Qizhi Zhang, Zongyi Li, Yunxiang Zhong, Yingqiang Xu, Haiqiao Ni, Donghai Wu, Chengao Yang, Zhichuan Niu

引用次数: 0