Matthew Escarra1
Tulane University1
Huygens metasurfaces, utilizing coupled electric and magnetic dipole resonances in nanophotonic structures, show promise for integrated photonics, flat optics, and optical modulators. Novel phase tunable materials such as antimony trisulfide (Sb<sub>2</sub>S<sub>3</sub>) and vanadium dioxide (VO<sub>2</sub>) may be used directly as nanoresonators to take advantage of the high sensitivity of this type of metasurface, enabling highly tunable optics with binary (Sb<sub>2</sub>S<sub>3</sub>, non-volatile) or continuous (VO<sub>2</sub>, volatile) variability. Amplitude and phase modulators, beam deflectors, varifocal lenses, and tunable holograms are possible with these materials. Here we report progress in design, nanofabrication, and characterization of tunable metasurface optics from these materials. Related advances with Huygens metasurface-based biosensing and 2D materials will be briefly mentioned.