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Investigation on the angular dependent reflectance of coupled high-contrast gratings

: Kroker, Stefanie; Käsebier, Thomas; Kley, Ernst-Bernhard; Tünnermann, Andreas


Chang-Hasnain, C.J. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
High Contrast Metastructures III : February 2014, San Francisco, California, United States
Bellingham, WA: SPIE, 2014 (Proceedings of SPIE 8995)
ISBN: 978-0-8194-9908-0
Paper 89950B
Conference "High Contrast Metastructures" <3, 2014, San Francisco/Calif.>
Conference Paper
Fraunhofer IOF ()
high-contrast gratings; diffraction gratings; broadband reflectors; coupled grating reflectors

In this contribution we discuss configurations of stacked silicon high contrast gratings (HCGs) which are separated by a thin silicon dioxide grating such that they are coupled via their near-fields. For a given configuration altering incidence angle allows to either benefit from the optical performance of two separated HCGs or one single grating with enhanced thickness. This effect can serve to realize filters with tailored optical properties and for diffractive cavity couplers. We experimentally demonstrate the coupling effect on a stack of two HCGs for a wavelength of 1550nm and transverse-magnetic polarization. The investigated structure provides a nearly angular independent high reflectance.