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A Bifunctional Silicon Dielectric Metasurface Based on Quasi-Bound States in the Continuum. NANOMATERIALS 2021; 11:nano11092357. [PMID: 34578673 PMCID: PMC8465900 DOI: 10.3390/nano11092357] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/07/2021] [Revised: 09/06/2021] [Accepted: 09/08/2021] [Indexed: 11/22/2022]
Abstract
Quasi-bound states in the continuum provide an effective and observable way to improve metasurface performance, usually with an ultra-high-quality factor. Dielectric metasurfaces dependent on Mie resonances have the characteristic of significantly low loss, and the polarization can be affected by the parameter tuning of the structure. Based on the theory of quasi-bound states in the continuum, we propose and simulate a bifunctional resonant metasurface, whose periodic unit structure consists of four antiparallel and symmetrical amorphous silicon columns embedded in a poly(methyl methacrylate) layer. The metasurface can exhibit an extreme Huygens’ regime in the case of an incident plane wave with linear polarization, while exhibiting chirality in the case of incident circular polarized light. Our structure provides ideas for promoting the multifunctional development of flat optical devices, as well as presenting potential in polarization-dependent fields.
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Li Z, Tang F, Shang S, Wu J, Shao J, Liao W, Kong B, Zeng T, Ye X, Jiang X, Yang L. Compact metalens-based integrated imaging devices for near-infrared microscopy. OPTICS EXPRESS 2021; 29:27041-27047. [PMID: 34615126 DOI: 10.1364/oe.431901] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Accepted: 07/05/2021] [Indexed: 06/13/2023]
Abstract
With current trends to progressively miniaturize optical systems, it is now essential to look for alternative methods to control light at extremely small dimensions. Metalenses are composed of subwavelength nanostructures and have an excellent ability to manipulate the polarization, phase, and amplitude of incident light. Although great progress of metalenses has been made, the compact metalens-integrated devices have not been researched adequately. In the study, we present compact imaging devices for near-infrared microscopy, in which a metalens is exploited. The indicators including resolution, magnification, and image quality are investigated via imaging several specimens of intestinal cells to verify the overall performance of the imaging system. The further compact devices, where the metalens is integrated directly on the CMOS imaging sensor, are also researched to detect biomedical issues. This study provides an approach to constructing compact imaging devices based on metalenses for near-infrared microscopy, micro-telecopy, etc., which can promote the miniaturization tending of futural optical systems.
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Tang F, Ye X, Li Q, Li H, Yu H, Wu W, Li B, Zheng W. Quadratic Meta-Reflectors Made of HfO 2 Nanopillars with a Large Field of View at Infrared Wavelengths. NANOMATERIALS 2020; 10:nano10061148. [PMID: 32545341 PMCID: PMC7353395 DOI: 10.3390/nano10061148] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 05/23/2020] [Accepted: 06/04/2020] [Indexed: 01/11/2023]
Abstract
Metasurfaces, being composed of subwavelength nanostructures, can achieve peculiar optical manipulations of phase, amplitude, etc. A large field of view (FOV) is always one of the most desirable characteristics of optical systems. In this study, metasurface-based quadratic reflectors (i.e., meta-reflectors) made of HfO2 nanopillars are investigated to realize a large FOV at infrared wavelengths. First, the geometrical dependence of HfO2 nanopillars' phase difference is analyzed to show the general principles of designing infrared HfO2 metasurfaces. Then, two meta-reflectors with a quadratic phase profile are investigated to show their large FOV, subwavelength resolution, and long focal depth. Furthermore, the two quadratic reflectors also show a large FOV when deflecting a laser beam with a deflecting-angle range of approximately ±80°. This study presents a flat optical metamaterial with a large FOV for imaging and deflecting, which can greatly simplify the optical-mechanical complexity of infrared systems, particularly with potential applications in high-power optical systems.
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Affiliation(s)
- Feng Tang
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; (F.T.); (Q.L.); (W.W.); (B.L.)
| | - Xin Ye
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; (F.T.); (Q.L.); (W.W.); (B.L.)
- Correspondence: (X.Y.); (W.Z.); Tel.: +86-153-9778-0786 (X.Y.); +86-183-2821-8958 (W.Z.)
| | - Qingzhi Li
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; (F.T.); (Q.L.); (W.W.); (B.L.)
| | - Hailiang Li
- Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics of Chinese Academy of Sciences, Beijing 100029, China;
| | - Haichao Yu
- Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215125, Jiangsu, China;
| | - Weidong Wu
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; (F.T.); (Q.L.); (W.W.); (B.L.)
| | - Bo Li
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; (F.T.); (Q.L.); (W.W.); (B.L.)
| | - Wanguo Zheng
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; (F.T.); (Q.L.); (W.W.); (B.L.)
- IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China
- Correspondence: (X.Y.); (W.Z.); Tel.: +86-153-9778-0786 (X.Y.); +86-183-2821-8958 (W.Z.)
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