Optics express最新文献_第9页

Research on the OFDR strain measurement method based on similarity features of dual-segment RSS. 基于双段 RSS 相似特征的 OFDR 应变测量方法研究。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-07-15 DOI: 10.1364/OE.527711

Gan Yu, Cheng HuanRan, Jiang HaoTian, Liu GuoDong, Liu BingGuo, Chen FengDong, Lu BingHui

{"title":"Research on the OFDR strain measurement method based on similarity features of dual-segment RSS.","authors":"Gan Yu, Cheng HuanRan, Jiang HaoTian, Liu GuoDong, Liu BingGuo, Chen FengDong, Lu BingHui","doi":"10.1364/OE.527711","DOIUrl":"https://doi.org/10.1364/OE.527711","url":null,"abstract":"Optical frequency domain reflectometry (OFDR) is a research hotspot in fiber optic sensing technology. This technology can be used for strain, vibration and temperature sensing and has great application prospects in fields such as deformation analysis of aerospace components and bridge monitoring. This article analyzes the reasons for strain demodulation errors under large strains. In response to the problem of reduced similarity between the reference state signal and the measured state signal, a strain measurement method based on the similarity feature of a double-segment Rayleigh scattering spectrum is proposed. Local segments at both ends of the reference state signal are used as new fingerprint spectra, and the offset of the measured state signal similarity spectrum is synchronously searched after extension. At the same time, by revealing the mechanism of strain edge demodulation errors, a strain edge optimization method based on automatic adjustment of the sliding window center position is proposed. A comparison experiment was conducted with traditional methods to verify the effectiveness of the above method. Finally, a sensing unit length of 32.6 mm was achieved with a frequency modulation bandwidth of 5 nm, and the measurement range was from ± 2000 µɛ to ± 2500 µɛ. The measurable spectral offset was increased from 48% to 60%, with a maximum standard deviation of 1.9 µɛ.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"32 15","pages":"26640-26652"},"PeriodicalIF":3.2,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142625594","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

Spatiotemporal walk-off and improved focusing of plasma THz sources. 等离子体太赫兹源的时空漫步和改进聚焦。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-07-15 DOI: 10.1364/OE.530149

Rodrigo T Paulino, Benjamin Colmey, David G Cooke

{"title":"Spatiotemporal walk-off and improved focusing of plasma THz sources.","authors":"Rodrigo T Paulino, Benjamin Colmey, David G Cooke","doi":"10.1364/OE.530149","DOIUrl":"https://doi.org/10.1364/OE.530149","url":null,"abstract":"High-field THz sources with peak field strengths exceeding MV/cm are essential for nonlinear THz spectroscopy and coherent control of matter on ultrafast time scales. Two-color femtosecond laser plasma sources employing long filamentation have been reported as providing single-cycle, >MV/cm fields, with multi-decade spanning bandwidth and polarization control, making them promising sources for such experiments. In this work, we report the observation of spatiotemporal spreading of the THz pulse when standard off-axis parabolic mirrors are used for collection and focusing of long filament plasma-based THz pulses. This produces a flying focus for THz light, with the axial focal region propagating at a velocity of 1/3 the speed of light. The THz emission is then subsequently spread over a temporal width of ∼10 ps, approximately 100 times the THz pulse duration detected by electro-optic sampling at any single point along the focus. The consequences of this non-ideal focusing are a potential and drastic overestimation of the peak THz electric field based on energy measurements, as well as significant phase noise arising from beam pointing fluctuations. We show that this spatiotemporal spreading can be minimized using a simple axicon lens that perfectly collimates the extended filament source, resulting in improved spatial and temporal focusing of the THz pulse.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"32 15","pages":"26351-26358"},"PeriodicalIF":3.2,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142625598","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

Ultra-broadband microwave absorber based on disordered metamaterials. 基于无序超材料的超宽带微波吸收器。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-07-15 DOI: 10.1364/OE.529831

Ju Gao, Zonghui Li, Zhangziyi Jin, Xin Che

{"title":"Ultra-broadband microwave absorber based on disordered metamaterials.","authors":"Ju Gao, Zonghui Li, Zhangziyi Jin, Xin Che","doi":"10.1364/OE.529831","DOIUrl":"https://doi.org/10.1364/OE.529831","url":null,"abstract":"Metamaterial absorption technology plays an increasingly important role in military and civilian sectors, serving crucial functions in communication, radar technology, and electromagnetic cloaking. However, traditional metamaterial absorbers are predominantly composed of periodic structures, thus limiting their absorption bandwidth, polarization, and angular flexibility. This study employs disordered structures, utilizing their randomness and diversity, to optimize and enhance the performance of periodic structure metamaterial absorbers. Building upon a well-designed periodic perfect absorption structure, a uniform distribution function is introduced to analyze the effects of positional and size disorder on the absorptive properties of the metamaterial. The mechanisms of the disorder are further investigated through simulation analysis. Subsequently, an innovative approach based on disorder engineering for broadband enhancement of metamaterial absorbers is proposed. Numerical simulation results and experimental validations demonstrate that absorbers constructed using this method significantly broaden the absorption bandwidth while maintaining excellent angular and polarization stability. This research not only offers a new method for the design and performance optimization of metamaterial absorbers but also provides a theoretical foundation for the development of metamaterial self-assembly techniques.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"32 15","pages":"25740-25754"},"PeriodicalIF":3.2,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142625621","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

Light induced self-assembly of one-dimensional PT-symmetric optical system exhibiting pulling force. 显示拉力的一维 PT 对称光学系统的光诱导自组装。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-07-15 DOI: 10.1364/OE.527307

Song Liu, Guangtao Cao, Liyong Cui

引用次数: 0

Complex phase modulation of liquid crystal devices with deep learning. 利用深度学习实现液晶设备的复杂相位调制。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-07-15 DOI: 10.1364/OE.532208

Qian Chen, Weiping Ding, Feng Jiang, Jiangang Lu

引用次数: 0

Enhancement and manipulation of nonreciprocity via dissipative coupling. 通过耗散耦合增强和操纵非互惠性

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-07-15 DOI: 10.1364/OE.529035

Ting-Ting Dong, Nan Wang, Zhi-Xiang Su, Ning Yuan, Shi-Yan Li, Lin Yu, Ai-Dong Zhu

{"title":"Enhancement and manipulation of nonreciprocity via dissipative coupling.","authors":"Ting-Ting Dong, Nan Wang, Zhi-Xiang Su, Ning Yuan, Shi-Yan Li, Lin Yu, Ai-Dong Zhu","doi":"10.1364/OE.529035","DOIUrl":"https://doi.org/10.1364/OE.529035","url":null,"abstract":"Classical and quantum nonreciprocity have important applications in information processing due to their special one-way controllability for physical systems. In this paper we investigate the nonreciprocal transmission and quantum correlation by introducing the dissipative coupling into a linear coupling system consisting of two microdisk resonators. Our research results demonstrate that even in the case of a stationary resonator, dissipative coupling can effectively induce nonreciprocity within the system. Moreover, the degree of nonreciprocity increases with the dissipative coupling strength. Importantly, the phase shift between the dissipative coupling and coherent coupling serves as a critical factor for controlling both nonreciprocal transmision and one-way quantum steering. Consequently, the introduction of dissipative coupling not only enhances the nonreciprocal transmission and nonreciprocal quantum correlation but also enables on-demand manipulation of nonreciprocity. This highlights dissipation as an effective means for manipulating classical and quantum nonreciprocity, thus playing a favorable role in chiral quantum networks.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"32 15","pages":"25726-25739"},"PeriodicalIF":3.2,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142625372","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

Composite photonic lattice with a broad channel to sustain topological interface states. 具有宽通道的复合光子晶格，可维持拓扑界面状态。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-07-15 DOI: 10.1364/OE.526154

Anli Xiang, Zhuohang Zhang, Tao Jiang, Gaofeng Wu, Lu Han, Yangjian Cai

引用次数: 0

Design of a three-frequency Rayleigh lidar for simultaneous temperature and wind measurements. 设计用于同时测量温度和风的三频雷利激光雷达。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-07-15 DOI: 10.1364/OE.527608

Leilei Sun, Xin Fang, Tao Li, Chengyun Yang, Xiankang Dou

{"title":"Design of a three-frequency Rayleigh lidar for simultaneous temperature and wind measurements.","authors":"Leilei Sun, Xin Fang, Tao Li, Chengyun Yang, Xiankang Dou","doi":"10.1364/OE.527608","DOIUrl":"https://doi.org/10.1364/OE.527608","url":null,"abstract":"This study proposes what we believe to be a novel high-spectral-resolution three-frequency Rayleigh lidar for simultaneously measuring middle atmosphere temperature and wind. The temperature and wind could be retrieved without assuming an external reference temperature, as typical for a traditional Rayleigh Doppler lidar. Adopting a similar idea used in sodium temperature/wind lidar, this system alternatively emits laser pulses at three frequencies. It receives the corresponding Rayleigh backscattered signals filtered by an iodine cell as a frequency discriminator. The three frequencies are optimized based on the spectral characteristics resulting from the convolution of the pulse laser lineshape convolved Rayleigh scattering signal with iodine molecular absorption spectrum. A two-dimensional calibration curve for temperature and wind ratio is then generated from the theoretical calculation of the final convoluted spectra and used to retrieve temperature and wind simultaneously. Simulated with the return signals collected by a current broadband Rayleigh lidar (30-inch telescope and 15 W output laser power), the temperature and wind uncertainties with resolutions of 1 km and 1 hr are estimated to be 0.4 K and 0.35 m/s, respectively, at 30 km and increase to 16.3 K and 8.1 m/s at 70 km.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"32 15","pages":"25995-26005"},"PeriodicalIF":3.2,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142625285","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

Design of boadband THz multi-beam splitting metasurface. 设计波段太赫兹多波束分裂元表面。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-07-15 DOI: 10.1364/OE.529823

Yan Teng, Tengyu Wang, Chun Li, Zhengwei Huang, Ling Jiang

{"title":"Design of boadband THz multi-beam splitting metasurface.","authors":"Yan Teng, Tengyu Wang, Chun Li, Zhengwei Huang, Ling Jiang","doi":"10.1364/OE.529823","DOIUrl":"https://doi.org/10.1364/OE.529823","url":null,"abstract":"Generating multiple local oscillator (LO) beams by beam splitters is a crucial aspect of large heterodyne array receivers operating at terahertz (THz) frequencies, with over 100 pixels. Metasurfaces have received considerable attention due to their unique and flexible wavefront modulation capabilities. Nevertheless, the design of beam-splitting metasurfaces faces significant challenges in increasing the number of diffraction beams, improving power efficiency, and achieving greater homogeneity. A SA-GS-based design model for beam-splitting metasurfaces is proposed to achieve multi-beam with high power efficiency and homogeneity. As a proof of concept, we have designed and optimized a 16-beam splitting metasurface from 0.82 THz to 1.6 THz. The objective is to develop large-pixel THz multi-beam heterodyne array receivers and optical systems. The number of beams is also extended to 100-, 144-, 225-, and 289-beam configurations, with power efficiencies of 93.55%, 93.92%, 96.01%, and 96.18% at 0.85 THz, respectively. Moreover, the main beams exhibit excellent homogeneity. This model can be employed in the design of multi-beam metasurfaces with variable deflection angles and intensity ratios. Finally, the multi-beam splitting metasurface is fabricated, and the experimental measurement agrees with the simulation. This work presents an effective approach for the inverse design of beam splitters or holographic imaging devices.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"32 15","pages":"26195-26206"},"PeriodicalIF":3.2,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142625293","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

Particle composition-specific approach to estimate the particulate organic carbon concentration off the coastal areas of Guangdong and eastern Hainan Island. 根据颗粒物组成估算广东和海南岛东部沿海地区颗粒物有机碳浓度。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-07-15 DOI: 10.1364/OE.525866

Panpan Wei, Wen Zhou, Cai Li, Lin Deng, Wendi Zheng, Zhantang Xu, Zhen Shi, Zihui Wang, Min Qin, Zeming Yang, Wenxi Cao

{"title":"Particle composition-specific approach to estimate the particulate organic carbon concentration off the coastal areas of Guangdong and eastern Hainan Island.","authors":"Panpan Wei, Wen Zhou, Cai Li, Lin Deng, Wendi Zheng, Zhantang Xu, Zhen Shi, Zihui Wang, Min Qin, Zeming Yang, Wenxi Cao","doi":"10.1364/OE.525866","DOIUrl":"https://doi.org/10.1364/OE.525866","url":null,"abstract":"High optical complexity caused by the variability of marine particles poses a major challenge to the development of bio-optical algorithms for particulate organic carbon (POC) concentration retrievals from optical measurements in coastal waters. Here, we developed a particle composition-specific approach to estimate POC off the coastal areas of Guangdong and eastern Hainan Island, China. The ratio of phytoplankton absorption to detritus absorption coefficient aph(443)/ad(443) was used to optically discriminate water types. The samples with aph(443)/ad(443) ≤ 4.9 showed a significant correlation between POC and absorption line height at 676 nm aLH(676) (R2 = 0.75, n = 70, p < 0.01). In contrast, aph-dominant samples with aph(443)/ad(443) > 4.9 had a high covariance between POC and particle scattering coefficient at 675 nm bp(675) (R2 = 0.85, n = 37, p < 0.01). Validation with an independent dataset yielded a small positive bias (R2 = 0.81, APD = 23.10%, RMSE = 29.01 mg m-3, RPD = 16.31%). The approach provided a better estimation of POC concentration in coastal waters compared with univariate algorithms. A depth-resolved index aLH(676)/bbp(442) was defined as the ratio of absorption line height to particle backscattering coefficient. Using the depth-resolved index instead of aph(443)/ad(443) for optical water type classification can be utilized to represent the vertical variations of POC in 1 m bins, and can complement remote sensing observations to accurately characterize the three-dimensional structure of POC distribution in the oceans.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"32 15","pages":"25644-25660"},"PeriodicalIF":3.2,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142625585","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