Speaker
Description
We present the design and experimental demonstration of a sub-percent loss dielectric metasurface mirror operating at 1064 nm, the wavelength used in current gravitational wave interferometers. The titanium dioxide nanopillar array on a glass substrate achieves high reflectivity using a single layer. The mirror operates via guided-mode resonance in a periodic dielectric structure designed for normal incidence. Unlike conventional multilayer coatings, the resonant metasurface offers the possibility of substantially reduced coating thermal noise by eliminating thick high/low index stacks. These results establish dielectric metasurfaces as a viable candidate mirror platform for future gravitational wave detectors and other precision measurement experiments limited by coating thermal noise.