Three-dimensional inverted photonic grating with engineerable refractive indices for broadband antireflection of terahertz waves

Yuting Wu Chen, Pengyu Han, X. C. Zhang, Mei Ling Kuo, Shawn Yu Lin

Research output: Contribution to journalArticle


Reduction of reflection is of great importance in optical spectroscopy to reduce interference and increase throughput. Here we demonstrate a three-dimensional inverted photonic grating device design using only one material-silicon. Enhanced transmission compared to planar silicon wafers is observed from 0:2 THz to over 7:3 THz for a device with a 15 μm period, which covers most of the terahertz band, and its relative 3 dB bandwidth (δf/fc) =f c is a noteworthy 116.3%. Moreover, the device is polarization independent and can perform up to a large incident angle.

Original languageEnglish (US)
Pages (from-to)3159-3161
Number of pages3
JournalOptics Letters
Issue number19
StatePublished - Oct 1 2010
Externally publishedYes


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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