Optical antennas are analogs of radio antennas that provide efficient coupling between nanoscale volumes and farfield radiation. In this talk, I will present an present a brief overview of my work on using optical antennas for enhanced light-matter interaction. I will talk about our recent work on ultrafast electron-photon conversion in two-dimensional tunnel junctions formed by gold electrodes and hexagonal boron nitride as the tunnel barrier. I will show that such a tunnel junction coupled to optical antennas achieves polarized, directional and resonantly enhanced light emission from inelastic electron tunneling, and establishes a novel platform for studying the interaction of electrons with strong electromagnetic fields.
Speaker: Palash Bharadwaj