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19 February 2014 Investigation on the angular dependent reflectance of coupled high-contrast gratings
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Proceedings Volume 8995, High Contrast Metastructures III; 89950B (2014)
Event: SPIE OPTO, 2014, San Francisco, California, United States
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.
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Stefanie Kroker, Thomas Käsebier, Ernst-Bernhard Kley, and Andreas Tünnermann "Investigation on the angular dependent reflectance of coupled high-contrast gratings", Proc. SPIE 8995, High Contrast Metastructures III, 89950B (19 February 2014);

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