A new type of mirror, based on guided-mode resonance, was proposed and discussed to provide a mirror having high reflectance and large wavelength dependence of reflection phase variation. The proposed mirror consists of a surface grating integrated in a channel waveguide on a high-reflection layer. A -based device was fabricated for 0.85-μm wavelength operation, and reflection phase variation of almost , with wavelength change of sub-nanometers, was confirmed experimentally.
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