標題: Polarization- selective ultra-broadband super absorber
作者: Zhong, Yan Kai
Fu, Sze Ming
Huang, Weiming
Rung, Ding
Huang, Jian Yi-Wen
Parashar, Parag
Lin, Albert
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
公開日期: 20-Feb-2017
摘要: While a broadband metamaterial perfect absorber (MPA) has been implemented and proposed intensively in recent years, an ultra-broadband perfect absorber with polarization selectivity has not been realized in literature. In this work, we propose a configuration of polarization-selective (PS) MPA with ultra-wide absorption bandwidth. The aluminum wire grid is integrated on top of the ultrathin-metal-dielectric stacking. The transverse electric (TE) wave is blocked due to the requirement of zero tangential electric field at the metal surface. The transverse magnetic field can pass the aluminum wire-grids because the normal electric field can be supported by the surface charge density at the metal surface, and full absorption of the TM wave is accomplished by the metal-dielectric stacking beneath. Theoretical calculation using rigorously coupled wave analysis demonstrates the wavelength selectivity from lambda = 1.98 mu m to lambda = 11.74 mu m where the TE absorption is <0.04 while TM absorption is >0.95, using 300 nm thick aluminum (Al) wire grid with 16-pair SiO2/Ti stacking. Additionally, the design is wavelength scalable by adjusting the dielectric thickness (t(sio2)) and the wire grid period (P) and height (t). The experimental result is demonstrated using Al grids and Ti/SiO2, and the measured result fully supports the calculated prediction. (C) 2017 Optical Society of America
URI: http://dx.doi.org/10.1364/OE.25.00A124
http://hdl.handle.net/11536/144941
ISSN: 1094-4087
DOI: 10.1364/OE.25.00A124
期刊: OPTICS EXPRESS
Volume: 25
Issue: 4
起始頁: 0
結束頁: 0
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