Abstract
We numerically demonstrate an extraordinary optical transmission (EOT) through semiconductor gratings with plasmonic properties on a high-index substrate over a broad terahertz (THz) bandwidth at the plasmonic Brewster channel. The THz EOT is due to impedance matching, an inherently non-resonant mechanism, at the grating entrance and exit faces, which are periodically carved with tapered slits. The optimal grating geometry provides a transmission of over 85% over a broad 0.2–1.0 THz bandwidth at a Brewster angle of incidence of 75°. In addition, we introduce a perfect THz absorber with low-loss and metal-free properties over a broad operating bandwidth based on the plasmonic Brewster transmission concept.
© 2017 Optical Society of America
Full Article | PDF ArticleMore Like This
Ryo Kikkawa, Munehiro Nishida, and Yutaka Kadoya
J. Opt. Soc. Am. B 34(12) 2578-2585 (2017)
Masoud Edalatipour, Amin Khavasi, and Khashayar Mehrany
J. Opt. Soc. Am. B 32(6) 1202-1207 (2015)
Yanjun Bao, Yumin Hou, and Zongpeng Wang
J. Opt. Soc. Am. B 31(2) 255-258 (2014)