Abstract

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 0.2THz to over 7.3THz for a device with a 15µm period, which covers most of the terahertz band, and its relative 3dB bandwidth (δf/fc) is a noteworthy 116.3%. Moreover, the device is polarization independent and can perform up to a large incident angle.

© 2010 Optical Society of America

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