Speaker
Prof.
yohannes abate
(The University of Georgia)
Description
Metasurfaces control light propagation at the nanoscale for applications in both free-space
and surface-confined geometries. However, dynamically changing the properties of metasurfaces can be a major challenge. Here we demonstrate a reconfigurable hyperbolic
metasurface comprised of a heterostructure of isotopically enriched hexagonal boron nitride
(hBN) in direct contact with the phase-change material (PCM) single-crystal vanadium
dioxide (VO2). Metallic and dielectric domains in VO2 provide spatially localized changes in
the local dielectric environment, enabling launching, reflection, and transmission of hyperbolic phonon polaritons (HPhPs) at the PCM domain boundaries, and tuning the wavelength
of HPhPs propagating in hBN over these domains by a factor of 1.6. We show that this system
supports in-plane HPhP refraction, thus providing a prototype for a class of planar refractive
optics. This approach offers reconfigurable control of in-plane HPhP propagation and
exemplifies a generalizable framework based on combining hyperbolic media and PCMs to
design optical functionality.
Apply to be<br> considered for a student <br> award (Yes / No)?
NA
Level for award<br> (Hons, MSc, <br> PhD, N/A)?
NA
Primary author
Prof.
yohannes abate
(The University of Georgia)
