0.2 λ0 thick adaptive retroreflector made of spin-locked metasurface

The metasurface concept is employed to planarize retroflectors by stacking two metasurfaces with separation that is two orders larger than the wavelength. Here, a retroreflective metasurface using subwavelength-thick reconfigurable C-shaped resonators (RCRs) is reported, which reduces the overall th...

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Main Authors: Yan, Libin, Zhu, Weiming, Muhammad Faeyz Karim, Cai, Hong, Gu, Alex Yuandong, Shen, Zhongxiang, Chong, Peter Han Joo, Kwong, Dim-Lee, Qiu, Cheng-Wei, Liu, Ai Qun
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/138701
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1387012020-05-12T02:52:15Z 0.2 λ0 thick adaptive retroreflector made of spin-locked metasurface Yan, Libin Zhu, Weiming Muhammad Faeyz Karim Cai, Hong Gu, Alex Yuandong Shen, Zhongxiang Chong, Peter Han Joo Kwong, Dim-Lee Qiu, Cheng-Wei Liu, Ai Qun School of Electrical and Electronic Engineering Engineering::Electrical and electronic engineering Adaptive Metasurfaces Retroreflection The metasurface concept is employed to planarize retroflectors by stacking two metasurfaces with separation that is two orders larger than the wavelength. Here, a retroreflective metasurface using subwavelength-thick reconfigurable C-shaped resonators (RCRs) is reported, which reduces the overall thickness from the previous record of 590 λ0 down to only 0.2 λ0 . The geometry of RCRs could be in situ controlled to realize equal amplitude and phase modulation onto transverse magnetic (TM)-polarized and transverse electric (TE)-polarized incidences. With the phase gradient being engineered, an in-plane momentum could be imparted to the incident wave, guaranteeing the spin state of the retro-reflected wave identical to that of the incident light. Such spin-locked metasurface is natively adaptive toward different incident angles to realize retroreflection by mechanically altering the geometry of RCRs. As a proof of concept, an ultrathin retroreflective metasurface is validated at 15 GHz, under various illumination angles at 10°, 12°, 15°, and 20°. Such adaptive spin-locked metasurface could find promising applications in spin-based optical devices, communication systems, remote sensing, RCS enhancement, and so on. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) 2020-05-12T02:52:15Z 2020-05-12T02:52:15Z 2018 Journal Article Yan, L., Zhu, W., Muhammad Faeyz Karim, Cai, H., Gu, A. Y., Shen, Z., . . . Liu, A. Q. (2018). 0.2 λ0 thick adaptive retroreflector made of spin-locked metasurface. Advanced materials, 30(39), 1802721-. doi:10.1002/adma.201802721 0935-9648 https://hdl.handle.net/10356/138701 10.1002/adma.201802721 30129232 2-s2.0-85052380467 39 30 en Advanced materials © 2018 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved. This paper was published in Advanced materials and is made available with permission of WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim.
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Engineering::Electrical and electronic engineering
Adaptive Metasurfaces
Retroreflection
spellingShingle Engineering::Electrical and electronic engineering
Adaptive Metasurfaces
Retroreflection
Yan, Libin
Zhu, Weiming
Muhammad Faeyz Karim
Cai, Hong
Gu, Alex Yuandong
Shen, Zhongxiang
Chong, Peter Han Joo
Kwong, Dim-Lee
Qiu, Cheng-Wei
Liu, Ai Qun
0.2 λ0 thick adaptive retroreflector made of spin-locked metasurface
description The metasurface concept is employed to planarize retroflectors by stacking two metasurfaces with separation that is two orders larger than the wavelength. Here, a retroreflective metasurface using subwavelength-thick reconfigurable C-shaped resonators (RCRs) is reported, which reduces the overall thickness from the previous record of 590 λ0 down to only 0.2 λ0 . The geometry of RCRs could be in situ controlled to realize equal amplitude and phase modulation onto transverse magnetic (TM)-polarized and transverse electric (TE)-polarized incidences. With the phase gradient being engineered, an in-plane momentum could be imparted to the incident wave, guaranteeing the spin state of the retro-reflected wave identical to that of the incident light. Such spin-locked metasurface is natively adaptive toward different incident angles to realize retroreflection by mechanically altering the geometry of RCRs. As a proof of concept, an ultrathin retroreflective metasurface is validated at 15 GHz, under various illumination angles at 10°, 12°, 15°, and 20°. Such adaptive spin-locked metasurface could find promising applications in spin-based optical devices, communication systems, remote sensing, RCS enhancement, and so on.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Yan, Libin
Zhu, Weiming
Muhammad Faeyz Karim
Cai, Hong
Gu, Alex Yuandong
Shen, Zhongxiang
Chong, Peter Han Joo
Kwong, Dim-Lee
Qiu, Cheng-Wei
Liu, Ai Qun
format Article
author Yan, Libin
Zhu, Weiming
Muhammad Faeyz Karim
Cai, Hong
Gu, Alex Yuandong
Shen, Zhongxiang
Chong, Peter Han Joo
Kwong, Dim-Lee
Qiu, Cheng-Wei
Liu, Ai Qun
author_sort Yan, Libin
title 0.2 λ0 thick adaptive retroreflector made of spin-locked metasurface
title_short 0.2 λ0 thick adaptive retroreflector made of spin-locked metasurface
title_full 0.2 λ0 thick adaptive retroreflector made of spin-locked metasurface
title_fullStr 0.2 λ0 thick adaptive retroreflector made of spin-locked metasurface
title_full_unstemmed 0.2 λ0 thick adaptive retroreflector made of spin-locked metasurface
title_sort 0.2 λ0 thick adaptive retroreflector made of spin-locked metasurface
publishDate 2020
url https://hdl.handle.net/10356/138701
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