I will describe our latest work on tunable optical materials and adjacent topics, including the use of the phase-transition of vanadium dioxide to enable tunable devices and integration into frequency selective surfaces and metasurfaces, and new optical materials with giant anisotropy.
We report on the achievement of superior quality hexagonal boron nitride and aluminum nitride using ultrahigh temperature molecular beam epitaxy. We demonstrate high efficiency deep ultraviolet LEDs and low threshold laser diodes. Moreover, ultrahigh Q microring resonators using aluminum nitride on sapphire are also achieved.
In this talk, I will present a multilayer all-dielectric metasurface architecture with the goal of increasing the design landscape of metaoptics. Using this architecture we demonstrate independent control over any two properties; amplitude, phase, and polarization.