High-Efficiency, Dual-Band Beam Splitter Based on an All-Dielectric Quasi-Continuous Metasurface

Metasurface-based beam splitters attracted huge interest for their superior properties compared with conventional ones made of bulk materials. The previously reported designs adopted discrete metasurfaces with the limitation of a discontinuous phase profile. In this paper, we propose a dual-band bea...

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Main Authors: Jing Li, Yonggang He, Han Ye, Tiesheng Wu, Yumin Liu, Xuyi He, Jie Cheng
Format: Article
Language:English
Published: MDPI AG 2021-06-01
Series:Materials
Subjects:
Online Access:https://www.mdpi.com/1996-1944/14/12/3184
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spelling doaj-7aa7bc3cc4f04e1bb44d7312d9e67aa72021-06-30T23:45:20ZengMDPI AGMaterials1996-19442021-06-01143184318410.3390/ma14123184High-Efficiency, Dual-Band Beam Splitter Based on an All-Dielectric Quasi-Continuous MetasurfaceJing Li0Yonggang He1Han Ye2Tiesheng Wu3Yumin Liu4Xuyi He5Jing Li6Jie Cheng7State Key Laboratory of Information Photonics and Optical Communications, University of Posts and Telecommunications, Beijing 100876, ChinaSchool of Mechanical Engineering, Nanjing University of Science & Technology, Nanjing 210094, ChinaState Key Laboratory of Information Photonics and Optical Communications, University of Posts and Telecommunications, Beijing 100876, ChinaCollege of Information and Communication Engineering, Guilin University of Electronic Technology, Guilin 541004, ChinaState Key Laboratory of Information Photonics and Optical Communications, University of Posts and Telecommunications, Beijing 100876, ChinaSchool of Electronics and Internet of Things, Chongqing College of Electronic Engineering, Chongqing 401331, ChinaState Grid Information & Telecommunication Branch, Beijing 100761, ChinaState Grid Information & Telecommunication Branch, Beijing 100761, ChinaMetasurface-based beam splitters attracted huge interest for their superior properties compared with conventional ones made of bulk materials. The previously reported designs adopted discrete metasurfaces with the limitation of a discontinuous phase profile. In this paper, we propose a dual-band beam splitter, based on an anisotropic quasi-continuous metasurface, by exploring the optical responses under x-polarized (with an electric field parallel to the direction of the phase gradient) and y-polarized incidences. The adopted metasurface consists of two identical trapezoidal silicon antenna arrays with opposite spatial variations that lead to opposite phase gradients. The operational window of the proposed beam splitter falls in the infrared and visible region, respectively, for x- and y-polarized light, resulting from the different mechanisms. When x-polarized light is incident, the conversion efficiency and total transmission of the beam splitter remains higher than 90% and 0.74 within the wavelength range from 969 nm to 1054 nm, respectively. In this condition, each array can act as a beam splitter of unequal power. For y-polarized incidence, the maximum conversion efficiency and transmission reach approximately 100% and 0.85, while the values remain higher than 90% and 0.65 in the wavelength range from 687 nm to 710 nm, respectively. In this case, each array can be viewed as an effective beam deflector. We anticipate that it can play a key role in future integrated optical devices.https://www.mdpi.com/1996-1944/14/12/3184beam splitterquasi-continuous metasurfacerefractiondual-band
collection DOAJ
language English
format Article
sources DOAJ
author Jing Li
Yonggang He
Han Ye
Tiesheng Wu
Yumin Liu
Xuyi He
Jing Li
Jie Cheng
spellingShingle Jing Li
Yonggang He
Han Ye
Tiesheng Wu
Yumin Liu
Xuyi He
Jing Li
Jie Cheng
High-Efficiency, Dual-Band Beam Splitter Based on an All-Dielectric Quasi-Continuous Metasurface
Materials
beam splitter
quasi-continuous metasurface
refraction
dual-band
author_facet Jing Li
Yonggang He
Han Ye
Tiesheng Wu
Yumin Liu
Xuyi He
Jing Li
Jie Cheng
author_sort Jing Li
title High-Efficiency, Dual-Band Beam Splitter Based on an All-Dielectric Quasi-Continuous Metasurface
title_short High-Efficiency, Dual-Band Beam Splitter Based on an All-Dielectric Quasi-Continuous Metasurface
title_full High-Efficiency, Dual-Band Beam Splitter Based on an All-Dielectric Quasi-Continuous Metasurface
title_fullStr High-Efficiency, Dual-Band Beam Splitter Based on an All-Dielectric Quasi-Continuous Metasurface
title_full_unstemmed High-Efficiency, Dual-Band Beam Splitter Based on an All-Dielectric Quasi-Continuous Metasurface
title_sort high-efficiency, dual-band beam splitter based on an all-dielectric quasi-continuous metasurface
publisher MDPI AG
series Materials
issn 1996-1944
publishDate 2021-06-01
description Metasurface-based beam splitters attracted huge interest for their superior properties compared with conventional ones made of bulk materials. The previously reported designs adopted discrete metasurfaces with the limitation of a discontinuous phase profile. In this paper, we propose a dual-band beam splitter, based on an anisotropic quasi-continuous metasurface, by exploring the optical responses under x-polarized (with an electric field parallel to the direction of the phase gradient) and y-polarized incidences. The adopted metasurface consists of two identical trapezoidal silicon antenna arrays with opposite spatial variations that lead to opposite phase gradients. The operational window of the proposed beam splitter falls in the infrared and visible region, respectively, for x- and y-polarized light, resulting from the different mechanisms. When x-polarized light is incident, the conversion efficiency and total transmission of the beam splitter remains higher than 90% and 0.74 within the wavelength range from 969 nm to 1054 nm, respectively. In this condition, each array can act as a beam splitter of unequal power. For y-polarized incidence, the maximum conversion efficiency and transmission reach approximately 100% and 0.85, while the values remain higher than 90% and 0.65 in the wavelength range from 687 nm to 710 nm, respectively. In this case, each array can be viewed as an effective beam deflector. We anticipate that it can play a key role in future integrated optical devices.
topic beam splitter
quasi-continuous metasurface
refraction
dual-band
url https://www.mdpi.com/1996-1944/14/12/3184
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