Optical amplifier based on guided polaritons in GaN and ZnO

TL;DR

This paper introduces an optical amplifier using guided polaritons in GaN and ZnO waveguides, achieving significant gain at room temperature through stimulated scattering, with potential for integrated photonic applications.

Contribution

It presents a novel design for an optical amplifier based on strong coupling in GaN and ZnO waveguides, demonstrating feasible room-temperature operation with high gain.

Findings

Achieves 10dB gain with 80 μm length at room temperature.

Operates with 5 mA current in continuous wave regime.

Utilizes stimulated scattering from excitonic reservoir for amplification.

Abstract

We propose a scheme of an optical amplifier based on GaN and ZnO waveguides operating in the regime of strong coupling between photonic modes and excitonic resonances. Amplification of the guided exciton-polaritons is obtained by stimulated scattering from the excitonic reservoir, which is found to be fast enough compared with the large velocity of the guided polariton modes. We analyze the device parameters at different temperatures. We find that an 80 $\mu$m-long amplifier can provide a gain of 10dB at room temperature, being supplied by 5 mA current in the $cw$ regime.