SPIE/COS Photonics Asia最新文献_第5页

Cavity-coupled narrow bandwidth Fano resonance in dielectric metasurface 介质元表面中的腔耦合窄带宽法诺共振

SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2685341

Jiachen Yu, Qiqige Wulan, Li Xing, Zhijun Liu

{"title":"Cavity-coupled narrow bandwidth Fano resonance in dielectric metasurface","authors":"Jiachen Yu, Qiqige Wulan, Li Xing, Zhijun Liu","doi":"10.1117/12.2685341","DOIUrl":"https://doi.org/10.1117/12.2685341","url":null,"abstract":"Dielectric metasurfaces show great potential in light manipulation for applications such as optical filters and semiconductor metasurfaces for generating entangled photons. These applications critically rely on resonant mode properties in micro/nano-structured metasurfaces. Several modes including electric dipole (ED), magnetic dipole (MD), and quasi-bound state in the continuum resonance have been widely explored with the merits of high quality factor and narrow bandwidth. However, these reported metasurface resonances generally do not absorb light due to the transparency of dielectric materials, which limits their usage in some applications such as thermal emission and photon detection etc. In this work, we demonstrate a new class of dielectric metasurfaces, which exhibit the features of both strong light absorption and narrower bandwidth. Our fabricated metasurface consists of a Si cuboid array on top of a SiO2 spacer layer backed with a metallic Cu film. The cavity mode within the SiO2 spacer couples with electrical dipole in the Si cuboid, leading to an asymmetric narrow bandwidth Fano resonance within our metasurface structure. Our spectral measurements show that the Fano resonance occurs at the wavelength of 4.19 μm. It has a strong absorption efficiency of 65.8% and a narrow bandwidth of 32.5nm, corresponding to a quality factor as high as 112. As an example to reveal the potentials of our metasurface, the Fano resonance is applied in refractive index sensing with a sensitivity of 518.75nm/RIU and a high figure-of-merit (FoM) of 14.82 RIU-1. These results indicate that cavity-coupled dielectric metasurface presents an effective way for obtaining both strong light absorption and narrow bandwidth, opening new space for metasurface applications.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"50 1","pages":"1277304 - 1277304-5"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139220524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative research of mirror systems for extreme ultraviolet lithography illuminator 极紫外光刻照明器反射镜系统的比较研究

SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2686671

Shan Gao, E. Tsyganok, Galina Romanova

引用次数: 0

An on-chip atomic layer deposited waveguide amplifier with net gain at C-band 具有 C 波段净增益的片上原子层沉积波导放大器

SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2687603

Haotian Zhang, Shen-jun Zhu, Xiaoyan Zhou, Lin Zhang

引用次数: 0

A novel Rayleigh lidar signal denoising algorithm for far-field noise suppression and high-accuracy retrieval 用于远场噪声抑制和高精度检索的新型雷利激光雷达信号去噪算法

SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2687008

Tong Wu, Degang Xu, K. Zhong, Xianzhong Zhang, Xinqi Li, Xiaojian Zhang, Jianquan Yao

{"title":"A novel Rayleigh lidar signal denoising algorithm for far-field noise suppression and high-accuracy retrieval","authors":"Tong Wu, Degang Xu, K. Zhong, Xianzhong Zhang, Xinqi Li, Xiaojian Zhang, Jianquan Yao","doi":"10.1117/12.2687008","DOIUrl":"https://doi.org/10.1117/12.2687008","url":null,"abstract":"A novel signal denoising framework (EEMD-VMD-IMWOA) for Rayleigh lidar is proposed to better suppress noise in an atmospheric lidar echo signal and improve retrieval accuracy. The ensemble empirical mode decomposition (EEMD) is used to retain the intrinsic mode functions (IMFs) of signal as the low-frequency effective component. Based on the denoising ability of variational mode decomposition (VMD) under high noise signal, the IMFs with noise is further denoised by VMD to obtain high-frequency effective component, wherein the improved whale optimization algorithm (IMWOA) is used to get the optimal decomposition layer K and the quadratic penalty α of VMD. Then, the low-frequency and high-frequency effective components are reconstructed to gain denoised signal. The simulation results show that the denoising effect of EEMD-VMD-IMWOA is superior to Wavelet threshold, EEMD and VMD, especially the far-field noise interference can be suppressed. Under the condition that the temperature retrieval error is less than ± 10 K, when the integration time is only 600s, the effective retrieval altitude can reach 59.6km, which is 17.3% higher than that without denoising. Finally, the retrieval accuracy of the measured lidar signal is significantly improved by EEMD-VMD-IMWOA.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"19 1","pages":"1277205 - 1277205-11"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139227527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

SERS mapping of Mycobacterium tuberculosis single-cell with different drug resistance 具有不同抗药性的结核分枝杆菌单细胞 SERS 图谱

SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2688992

Andrey Y. Zyubin, Anastasia Lavrova, Ilia Samusev

引用次数: 0

A photonic approach to generate arbitrary chirp microwave waveforms using a direct modulated laser source 利用直接调制激光源生成任意啁啾微波波形的光子方法

SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2687616

Md. Danish Nadeem, Chandan Kumar, S. Raghuwanshi, Rajnish Raj, Ritesh Kumar, Santosh Kumar

引用次数: 0

Steerable dispersed beam for wireless optical power transfer 用于无线光功率传输的可转向分散光束

SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2688614

Ngoc-Luu Nguyen, Khanh-Hung Nguyen, Nadeem Javed, Jinyong Ha

引用次数: 0

Low phase noise optical delay line optoelectronic oscillator uncertainty evaluation 低相位噪声光延迟线光电振荡器不确定性评估

SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2689283

Patrice Salzenstein

引用次数: 0

Ultra-wide angle metalens design with ray-based and wave-based tools 利用射线和波纹工具进行超广角金属膜设计

SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2686361

Li-Ce Hu, Yijun Ding

{"title":"Ultra-wide angle metalens design with ray-based and wave-based tools","authors":"Li-Ce Hu, Yijun Ding","doi":"10.1117/12.2686361","DOIUrl":"https://doi.org/10.1117/12.2686361","url":null,"abstract":"Designing a metalens of millimeter scale or larger is challenging. We demonstrate how to combine a ray-based automatic design tool with a wave-based inverse design tool to design a mm-size ultra-wide angle metalens imaging system. The ray-based approach parametrizes the distribution of meta-atom design parameters over the surface with a polynomial, and treat the metalens similarly to a grating. The ray-based design tool considers both the transmission and the phase of the meta-atoms as functions of the incident angle. The ray-based approach is fast and robust. It can complete the optimization of a mm-size metalens in a few minutes. This design can then serve as a starting point for a wave-based inverse design tool. The wave-based inverse design tool is applied to further optimize the metalens with arbitrary distribution of meta-atom design parameters. The additional design freedom offered by the arbitrary distribution further increases the light collection efficiency and image resolution. Finally, the design performance is validated with a finite difference time domain (FDTD) algorithm. All analysis results agree well, show that the final ultra-wide angle metalens design is close to diffraction limited. These results demonstrate the effectiveness of our proposed workflow by taking advantage of both the ray-based and the wave-based design tools.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"58 1","pages":"127650D - 127650D-6"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139224401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Real-time aimer based on special-shaped microlens and optical fiber bundle 基于异形微透镜和光纤束的实时瞄准器

SPIE/COS Photonics Asia Pub Date : 2023-11-28 DOI: 10.1117/12.2689239

Anzhi Wang, Jiabin Wang, Zhaoxu Gan, Yuxiang Yan, Shengjia Wang, Qi Yan, Tao Geng, Shuang Chen, Pengfei Wang, Weimin Sun

{"title":"Real-time aimer based on special-shaped microlens and optical fiber bundle","authors":"Anzhi Wang, Jiabin Wang, Zhaoxu Gan, Yuxiang Yan, Shengjia Wang, Qi Yan, Tao Geng, Shuang Chen, Pengfei Wang, Weimin Sun","doi":"10.1117/12.2689239","DOIUrl":"https://doi.org/10.1117/12.2689239","url":null,"abstract":"High precision alignment between the fiber core in the focal plane and the image of the target star is of great significance for the observation of multi-target telescopes. In this work, we propose and demonstrate a Special-shaped Micro-lens Aimer for Real-time Targeting, namely SMART, combining a special-shaped microlens and a fiber bundle to realize online alignment and improve the coupling efficiency of fibers. The platform in the center of the microlens transmits the starlight to the science fiber of the fiber bundle without changes in focal ratio. Six side micro-lenses couple leakage light to six feedback fibers and return misalignment signals. The structural parameters of SMART are well designed. Fresnel diffraction theory is applied to build a model for simulating the performance of SMART. In the SMART measurement, a pinhole with a diameter of 200 μm is used to imitate the effect of atmospheric turbulence during astronomical observations. Experimental results indicate that when the image spot is offset relative to the science fiber, the misaligned direction and displacement distance are identified by the signal of feedback fibers in SMART with a resolution of 0.02 mm and a detection range of 0.08 mm to 0.26 mm.","PeriodicalId":149506,"journal":{"name":"SPIE/COS Photonics Asia","volume":"58 1","pages":"127640N - 127640N-9"},"PeriodicalIF":0.0,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139224875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0