High-efficiency, cryogenic-compatible grating couplers on an AlN-on-sapphire platform through bottom-side coupling.
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DOI: 10.1364/ol.549201
Abstract: Sapphire is a commonly used substrate for wide-bandgap III-nitride photonic materials. However, its relatively high refractive index results in low transmission efficiency in grating couplers. Here, we propose and demonstrate that the transmission efficiency can… read more here.
Keywords: sapphire; bottom side; efficiency; side coupling ... See more keywords