Reconfigurable Indefinite Nanophotonics

 Indefinite media supporting electromagnetic states with large wavevectors and featuring a hyperbolic isofrequency surface have been shown to exhibit a variety of peculiar properties such as negative refraction, broadband Purcell enhancement as well as nanoscale confinement of light. In this talk, I will discuss how the use of phase change materials in the nanostructure is a very effective strategy to tune these properties on-demand. Specifically, I will give examples of volatile and non-volatile hyperbolic metamaterials where the topology of the optical isofrequency surface can be reconfigured to harness effects such as toggling between negative and positive refraction as well as dynamic control of the emission rate of quantum emitters. I will then discuss hyperbolic metasurfaces which are 2D analogues of hyperbolic metamaterials and their peculiar properties. Finally, I will touch upon our current nascent efforts towards realizing a reconfigurable hyperbolic metasurface.