Open AccessOptically transparent metamirror with broadband chiral absorption in the microwave region
Author(s) -
Xiangpeng Kong,
Zuojia Wang,
Liuge Du,
Chuanning Niu,
Chonglei Sun,
Jia Zhao,
Xun Li
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.383666
Subject(s) - microwave , broadband , optics , optoelectronics , bandwidth (computing) , absorption (acoustics) , resistive touchscreen , materials science , physics , telecommunications , quantum mechanics , computer science , electrical engineering , engineering
Chiral metamirror is one of the recently developed metadevices which can reflect designated circularly polarized waves, mimicking the exoskeleton of iridescent green beetles. Here, an optically transparent metamirror that can absorb microwave chiral photons in a broadband spectrum is demonstrated. A coupled mode theory is adopted to reveal the underlying physics for the improved bandwidth performance. Excellent agreements have been observed between numerical and experimental results, indicating a bandwidth for chiral absorption as high as 2.37 GHz. The optical transparence of the resistive patterns and substrate make the designed metamirrors suitable as microwave coatings in front of optical devices, which may find potential applications in cascaded optical systems working for both microwave and optical signals.