Emission enhanced exciton-polariton condensates with optical feedback

TL;DR

This paper demonstrates that introducing optical feedback into exciton-polariton condensates significantly enhances their emission intensity, offering new avenues for controlling polariton systems and advancing photonic neuromorphic computing.

Contribution

It is the first to explore optical feedback in the strong light-matter coupling regime of polariton condensates, revealing enhanced emission and potential for complex photonic applications.

Findings

Emission intensity increased by up to 110% with feedback

Polariton condensates respond strongly to optical feedback

Potential for connecting multiple condensates in neuromorphic systems

Abstract

Optical feedback is a well-known method of controlling laser dynamics, which has been widely studied in photonic systems to induce complex behaviors such as chaos or enhanced coherence. However, its application to systems in the strong light-matter coupling regime remains unexplored. In this work, we introduce a delayed optical feedback loop into a nonresonantly pumped polariton condensate. By feeding part of the emission back into the cavity to seed the next condensate, we observe a strong increase in the output intensity, up to 110%. We explain this effect using a classical rate equation model for the condensate coupled to excitonic reservoirs. Our results evidence that polariton condensates can respond strongly to optical feedback, congruent with well known polariton amplification techniques using resonant pump-probe setups. Our method opens new possibilities for using polariton feedback to connect multiple condensates and can be an essential step toward neuromorphic computing based on recurrent signaling in photonic systems.