Controlling the Response of Plasmonic Nano-Antennas through Gap-Loading

Abstract

Unlike previously reported works, in this paper, we aim to create a link between the radiating elements and the proposed device at a distance, so that the emission can be distantly and freely manipulated. We present here a new type of device, using nonlinear hybrid antenna-semiconductor interaction. We observe a picosecond transient response from the antenna that cannot be explained by either pure or antenna nonlinearities independently. We have shown that optical pumping of antenna-semiconductor interaction leads to a local reduction of the free-carrier density in the substrate. The transient nonlinear response of the antenna-semiconductor interaction hybrid shows a redshift of the plasmon resonance, as opposed to transient bleaching on SiO2.