Broadband asymmetric light transmission through tapered metallic gratings at visible frequencies

Bin Tang*, Zhongyang Li, Zizhuo Liu, Francois Callewaert, Koray Aydin

*Corresponding author for this work

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

Asymmetric transmission phenomenon has attracted tremendous research interest due to its potential applications in integrated photonic systems. Broadband asymmetric transmission (BAT) is a highly desirable but challenging functionality to achieve in the visible regime due to the limitation of material dispersion. In this paper, we propose and numerically demonstrate that a tapered-metal-grating structure (TMGS) can achieve high-contrast BAT spectra covering the entire visible region. The transmission efficiency reaches ∼95% for the forward illumination and ∼35% for the backward illumination at the same wavelengths, respectively, and the corresponding transmission ratio is larger than 2.5 over a broadband wavelength regime. Such a design with high performance suggests applications for unidirectional optical transmission, optical diode, and so on.

Original languageEnglish (US)
Article number39166
JournalScientific reports
Volume6
DOIs
StatePublished - Dec 13 2016

ASJC Scopus subject areas

  • General

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