Design and Numerical Analysis of an Infrared Cassegrain Telescope Based on Reflective Metasurfaces

Reflective imaging systems such as Cassegrain-type telescopes are widely utilized in astronomical observations. However, curved mirrors in traditional Cassegrain telescopes unavoidably make the imaging system bulky and costly. Recent developments in the field of metasurfaces provide an alternative w...

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Autores principales:	Song Yue, Zhe Zhang, Kunpeng Zhang, Huifang Guo, Ran Wang, Tonghui Dou, Dongliang Zhang, Lianqing Zhu, Haining Yang, Zichen Zhang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	reflective metasurface Cassegrain telescope silicon dioxide aluminum fabrication error Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/c2dadc7a187b410a97e4bc0bfae617af
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spelling	oai:doaj.org-article:c2dadc7a187b410a97e4bc0bfae617af2021-11-25T18:30:44ZDesign and Numerical Analysis of an Infrared Cassegrain Telescope Based on Reflective Metasurfaces10.3390/nano111129042079-4991https://doaj.org/article/c2dadc7a187b410a97e4bc0bfae617af2021-10-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/2904https://doaj.org/toc/2079-4991Reflective imaging systems such as Cassegrain-type telescopes are widely utilized in astronomical observations. However, curved mirrors in traditional Cassegrain telescopes unavoidably make the imaging system bulky and costly. Recent developments in the field of metasurfaces provide an alternative way to construct optical systems, possessing the potential to make the whole system flat, compact and lightweight. In this work, we propose a design for a miniaturized Cassegrain telescope by replacing the curved primary and secondary mirrors with flat and ultrathin metasurfaces. The meta-atoms, consisting of SiO<sub>2</sub> stripes on an Al film, provide high reflectance (>95%) and a complete phase coverage of 0~2π at the operational wavelength of 4 μm. The optical functionality of the metasurface Cassegrain telescope built with these meta-atoms was confirmed and studied with numerical simulations. Moreover, fabrication errors were mimicked by introducing random width errors to each meta-atom; their influence on the optical performance of the metasurface device was studied numerically. The concept of the metasurface Cassegrain telescope operating in the infrared wavelength range can be extended to terahertz (THz), microwave and even radio frequencies for real-world applications, where metasurfaces with a large aperture size are more easily obtained.Song YueZhe ZhangKunpeng ZhangHuifang GuoRan WangTonghui DouDongliang ZhangLianqing ZhuHaining YangZichen ZhangMDPI AGarticlereflective metasurfaceCassegrain telescopesilicon dioxidealuminumfabrication errorChemistryQD1-999ENNanomaterials, Vol 11, Iss 2904, p 2904 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	reflective metasurface Cassegrain telescope silicon dioxide aluminum fabrication error Chemistry QD1-999
spellingShingle	reflective metasurface Cassegrain telescope silicon dioxide aluminum fabrication error Chemistry QD1-999 Song Yue Zhe Zhang Kunpeng Zhang Huifang Guo Ran Wang Tonghui Dou Dongliang Zhang Lianqing Zhu Haining Yang Zichen Zhang Design and Numerical Analysis of an Infrared Cassegrain Telescope Based on Reflective Metasurfaces
description	Reflective imaging systems such as Cassegrain-type telescopes are widely utilized in astronomical observations. However, curved mirrors in traditional Cassegrain telescopes unavoidably make the imaging system bulky and costly. Recent developments in the field of metasurfaces provide an alternative way to construct optical systems, possessing the potential to make the whole system flat, compact and lightweight. In this work, we propose a design for a miniaturized Cassegrain telescope by replacing the curved primary and secondary mirrors with flat and ultrathin metasurfaces. The meta-atoms, consisting of SiO<sub>2</sub> stripes on an Al film, provide high reflectance (>95%) and a complete phase coverage of 0~2π at the operational wavelength of 4 μm. The optical functionality of the metasurface Cassegrain telescope built with these meta-atoms was confirmed and studied with numerical simulations. Moreover, fabrication errors were mimicked by introducing random width errors to each meta-atom; their influence on the optical performance of the metasurface device was studied numerically. The concept of the metasurface Cassegrain telescope operating in the infrared wavelength range can be extended to terahertz (THz), microwave and even radio frequencies for real-world applications, where metasurfaces with a large aperture size are more easily obtained.
format	article
author	Song Yue Zhe Zhang Kunpeng Zhang Huifang Guo Ran Wang Tonghui Dou Dongliang Zhang Lianqing Zhu Haining Yang Zichen Zhang
author_facet	Song Yue Zhe Zhang Kunpeng Zhang Huifang Guo Ran Wang Tonghui Dou Dongliang Zhang Lianqing Zhu Haining Yang Zichen Zhang
author_sort	Song Yue
title	Design and Numerical Analysis of an Infrared Cassegrain Telescope Based on Reflective Metasurfaces
title_short	Design and Numerical Analysis of an Infrared Cassegrain Telescope Based on Reflective Metasurfaces
title_full	Design and Numerical Analysis of an Infrared Cassegrain Telescope Based on Reflective Metasurfaces
title_fullStr	Design and Numerical Analysis of an Infrared Cassegrain Telescope Based on Reflective Metasurfaces
title_full_unstemmed	Design and Numerical Analysis of an Infrared Cassegrain Telescope Based on Reflective Metasurfaces
title_sort	design and numerical analysis of an infrared cassegrain telescope based on reflective metasurfaces
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/c2dadc7a187b410a97e4bc0bfae617af
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_version_	1718411102877908992

Design and Numerical Analysis of an Infrared Cassegrain Telescope Based on Reflective Metasurfaces

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