Journal of Optics最新文献_第6页

Tackling the focal shift effect for metalenses 解决金属透镜的焦移效应

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-06-11 DOI: 10.1088/2040-8986/ad52a0

Farhan Ali, Ramin Yazdaanpanah, Serap Aksu

{"title":"Tackling the focal shift effect for metalenses","authors":"Farhan Ali, Ramin Yazdaanpanah, Serap Aksu","doi":"10.1088/2040-8986/ad52a0","DOIUrl":"https://doi.org/10.1088/2040-8986/ad52a0","url":null,"abstract":"We present a theoretical analysis aimed at comprehending and mitigating the focal shift phenomenon in planar dielectric metalenses. To conduct this analysis, we introduce metalens designs consisting of silicon and germanium nanoblocks on a calcium fluoride substrate, operating in the mid-IR frequency range. The lensing performance of these metalenses is investigated using the finite-difference time-domain method, and they operate at wavelengths of 3 and 4 <italic toggle=\"yes\">µ</italic>m with a polarization conversion efficiency close to unity. Our findings indicate a strong correlation between the focal shift phenomena on dielectric metalenses and the numerical aperture (NA), revealing that increasing the Fresnel number is not always an effective approach to minimizing the focal shift. In contrast to previous studies, we define a critical NA, independent of the lens size, where the focal shift reaches a minimum, resulting in a symmetric focal intensity distribution and ultimately yielding a better-performing metalens. We demonstrate that for NAs greater than the determined critical value, a positive focal shift is observed on planar metalenses, diverging from the conventional negative shift predicted by existing models. Additionally, we show that by selecting a metalens within a specific NA range and with smaller diameters, high focusing efficiencies can be achieved. The focusing efficiency of the studied metalenses is measured as high as 70%, marking one of the best values reported for the IR range to date. These results serve as a guide for improving the agreement between experimental and designed metalens features, enhancing their practical applications.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"14 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141529385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Hot-carrier thermophotovoltaic systems 热载体热光电系统

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-05-21 DOI: 10.1088/2040-8986/ad4727

Kartika N Nimje, Maxime Giteau and Georgia T Papadakis

引用次数: 0

High Q chiroptical responses with maximum chirality in all-dielectric metasurfaces driven by quasi-bound states in the continuum 由连续体中的准束缚态驱动的全介质元表面中具有最大手性的高 Q 值iroptical 响应

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-05-19 DOI: 10.1088/2040-8986/ad44ab

Tian Ma, Jiangkun Tian, Wei Sang, Doudou Wang and Jun Li

{"title":"High Q chiroptical responses with maximum chirality in all-dielectric metasurfaces driven by quasi-bound states in the continuum","authors":"Tian Ma, Jiangkun Tian, Wei Sang, Doudou Wang and Jun Li","doi":"10.1088/2040-8986/ad44ab","DOIUrl":"https://doi.org/10.1088/2040-8986/ad44ab","url":null,"abstract":"Chiral metasurfaces have attracted considerable attention because of their immense potential for diverse applications requiring chiral light-matter interactions. Recently, boosted by a mechanism based on the concept of bound states in the continuum (BICs), high Q factor chiroptical resonances have been exhibited by breaking the inversion symmetries of planar metasurfaces. However, the optical chirality of these chiral metasurfaces is generally intolerable with respect to the structural geometries, especially the geometric asymmetry. Here, we present a novel chiral quasi-BIC with strong optical chirality in an all-dielectric metasurface. By simultaneously breaking the in-plane rotational and mirror symmetries, the chiral metasurface shows enhanced chiroptical resonances with near-unity CD (∼0.996) and high Q factors (∼2274) at terahertz frequencies. Further analyses based on numerical simulations reveal that the CD of the chiroptical resonance depicts exceptional remarkable tolerableness to the geometry asymmetry when are present in a broad range, while the corresponding Q factor is modulated accordingly. The results may develop a novel approach to manipulating the advanced optical chirality for potential applications requiring strong CD with enhanced light-matter interactions.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"35 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141147590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Adaptive multi-spectral mimicking with 2D-material nanoresonator networks 利用二维材料纳米震荡器网络进行自适应多光谱模拟

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-05-16 DOI: 10.1088/2040-8986/ad4722

Yujie Luo, Thomas Christensen and Ognjen Ilic

引用次数: 0

Propagation characteristics of twisted cosine-Gaussian Schell-model beams 扭曲余弦高斯谢尔模型光束的传播特性

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-05-14 DOI: 10.1088/2040-8986/ad4724

Shijie Dong, Yunzhe Yang, Yujie Zhou, Xinzhong Li and Miaomiao Tang

引用次数: 0

Switching between slow light and fast light by static magnetic field in a degenerate four-level atomic system at room temperature 室温下退化四级原子体系中的静磁场在慢光和快光之间的切换

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-05-14 DOI: 10.1088/2040-8986/ad4728

Nguyen Van Phu, Nguyen Huy Bang, Luong Thi Yen Nga and Le Van Doai

{"title":"Switching between slow light and fast light by static magnetic field in a degenerate four-level atomic system at room temperature","authors":"Nguyen Van Phu, Nguyen Huy Bang, Luong Thi Yen Nga and Le Van Doai","doi":"10.1088/2040-8986/ad4728","DOIUrl":"https://doi.org/10.1088/2040-8986/ad4728","url":null,"abstract":"The optical response of a magnetic-degenerated four-level atom system to the two left and right circular polarization components of the probe field is represented at room temperature. The absorption spectrum and group index for the two polarization components of the probe field are controlled according to the static magnetic field and the coupling field under electromagnetically induced transparency condition. By varying the strength of the static magnetic field, the optical response of the atomic medium can be changed from transparency to absorption or vice versa and hence the amplitude of group index also changes from positive extreme to negative extreme or vice versa. The same phenomenon also occurs when changing the coupling field intensity. In addition, temperature also significantly influence on the optical response of the atomic medium, which changes not only the amplitude but also the sign of the group index as the temperature increases. Our analytical results can be useful for experimental observation and related applications of light group index/velocity at room temperature.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"5 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140940170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Coexistence of varied intensities, phases, and polarization states along the direction of beam propagation 不同强度、相位和偏振态沿光束传播方向共存

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-05-13 DOI: 10.1088/2040-8986/ad4725

Jianhe Yang and Shaohua Tao

引用次数: 0

Yellow light privacy protection with anti-reflection structure based on photonic band gap principle 基于光子带隙原理的防反射黄光隐私保护结构

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-05-13 DOI: 10.1088/2040-8986/ad4726

Na Pei, Bao-Fei Wan, Sun-Xin Xie, Ting-Hao Zhang and Hai-Feng Zhang

引用次数: 0

On-axis complex-amplitude modulation for the generation of super-stable vector modes 用于产生超稳定矢量模式的轴向复振幅调制

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-05-12 DOI: 10.1088/2040-8986/ad4613

Valeria Rodríguez-Fajardo, Fernanda Arvizu, Dayver Daza-Salgado, Benjamin Perez-Garcia and Carmelo Rosales-Guzmán

{"title":"On-axis complex-amplitude modulation for the generation of super-stable vector modes","authors":"Valeria Rodríguez-Fajardo, Fernanda Arvizu, Dayver Daza-Salgado, Benjamin Perez-Garcia and Carmelo Rosales-Guzmán","doi":"10.1088/2040-8986/ad4613","DOIUrl":"https://doi.org/10.1088/2040-8986/ad4613","url":null,"abstract":"We propose a technique to generate complex vector beams with high quality and stability. Our approach relies on the combination of complex amplitude modulation (CAM) and on-axis modulation, two techniques that seem incompatible at first glance. The first one produces scalar structured light fields in phase and amplitude with high accuracy, while the second one is preferred for generating vector beams of great stability although of reduced quality. Specifically, the idea behind our technique is to send the shaped light produced by CAM co-axially with the zeroth order, rather than diffracted to the first order, as it is commonly done. We first describe our technique, explaining the generation of the hologram and experimental setup to isolate the desired vector mode, and then present experimental results that corroborate our approach. We first address the quality of the generated beams using Stokes polarimetry to reconstruct their transverse polarisation distribution, and then compare their stability against the same mode produced using a Sagnac interferometric method. Our vector beams are of good quality and remarkably stable, two qualities that we expect will appeal to the community working with vector modes.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"44 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140940169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Infrared imaging with nonlinear silicon resonator governed by high-Q quasi-BIC states 利用由高 Q 值准 BIC 状态支配的非线性硅谐振器进行红外成像

IF 2.1 4区物理与天体物理

Journal of Optics Pub Date : 2024-05-12 DOI: 10.1088/2040-8986/ad44a9

Gabriel Sanderson, Ze Zheng, Elizaveta Melik-Gaykazyan, George S D Gordon, Richard Cousins, Cuifeng Ying, Mohsen Rahmani and Lei Xu

{"title":"Infrared imaging with nonlinear silicon resonator governed by high-Q quasi-BIC states","authors":"Gabriel Sanderson, Ze Zheng, Elizaveta Melik-Gaykazyan, George S D Gordon, Richard Cousins, Cuifeng Ying, Mohsen Rahmani and Lei Xu","doi":"10.1088/2040-8986/ad44a9","DOIUrl":"https://doi.org/10.1088/2040-8986/ad44a9","url":null,"abstract":"Nonlinear light-matter interactions have emerged as a promising platform for various applications, including imaging, nanolasing, background-free sensing, etc. Subwavelength dielectric resonators offer unique opportunities for manipulating light at the nanoscale and miniturising optical elements. Here, we explore the resonantly enhanced four-wave mixing (FWM) process from individual silicon resonators and propose an innovative FWM-enabled infrared imaging technique that leverages the capabilities of these subwavelength resonators. Specifically, we designed high-Q silicon resonators hosting dual quasi-bound states in the continuum at both the input pump and signal beams, enabling efficient conversion of infrared light to visible radiation. Moreover, by employing a point-scanning imaging technique, we achieve infrared imaging conversion while minimising the dependence on high-power input sources. This combination of resonant enhancement and point-scanning imaging opens up new possibilities for nonlinear imaging using individual resonators and shows potential in advancing infrared imaging techniques for high-resolution imaging, sensing, and optical communications.","PeriodicalId":16775,"journal":{"name":"Journal of Optics","volume":"24 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140940167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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