Photoluminescence-driven Broadband Transmitting Directional Optical Nanoantennas

TL;DR

This paper demonstrates the use of plasmon-modulated photoluminescence as an effective and practical optical source to drive broadband transmitting directional nanoantennas, enabling new applications in optical nanotechnology.

Contribution

It introduces the novel use of nanoantenna photoluminescence as a practical driving source for directional nanoantennas, overcoming previous technical barriers.

Findings

Successful experimental realization of optical nano-spectrometer using Yagi-Uda nanoantennas

Demonstration of tunable broadband directional emission from log-periodic nanoantennas

Promotion of practical implementation of transmitting optical nanoantennas

Abstract

Optical nanoantennas mediate near and far optical fields. Operating a directional nanoantenna in transmitting mode is challenging as the antenna needs to be driven by a nanosized optical-frequency generator, working at the antenna resonance frequency and attached precisely to the antenna feed with a correct orientation. Quantum emitters have been used as optical nanogenerators. However, their precise positioning relative to the nanoantenna is a technical barrier to the practical implementation. One unique source to drive nanoantenna is the photoluminescence of the antenna material as the operation frequency range corresponds to the electronic transitions in matter. Here, we exploit plasmon-modulated photoluminescence (PMPL) as an effective optical source to drive directional nanoantennas. We experimentally realize two technically challenging theoretical proposals, namely, optical nano-spectrometer based on Yagi-Uda nanoantennas and tunable broadband directional emission from log-periodic nanoantennas. Using photoluminescence from the nanoantenna as an optical source promotes practical implementation of transmitting optical nanoantennas.