0.2 λ0 Thick Adaptive Retroreflector Made of Spin-Locked Metasurface

Autor: Libin Yan, Cheng-Wei Qiu, Hong Cai, Muhammad Faeyz Karim, Dim-Lee Kwong, Alex Yuandong Gu, Ai Qun Liu, Peter Han Joo Chong, Zhongxiang Shen, Weiming Zhu
Přispěvatelé: School of Electrical and Electronic Engineering
Rok vydání: 2018
Předmět:
Zdroj: Advanced Materials. 30:1802721
ISSN: 0935-9648
DOI: 10.1002/adma.201802721
Popis: 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)
Databáze: OpenAIRE
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