Towards perovskite based all-optical polariton logic circuitry

Abstract

Transitioning towards the next generation of computing architectures requires fundamental innovations at the transistor device and circuit level that comprise disruptive performance gains with focus on low-power and fast speed. We have already shown polariton logic gates in a vertical cavity structure utilizing strong exciton-photon coupling. However, to fully exploit the potential of such novel all-optical transistors a scalable technology is needed. Here, we will discuss the concept of in-plane high contrast grating (HCG) structures on SOI such as waveguides and cavities. HCG cavities at close distance on an SOI wafer have been fabricated and optically investigated. First optical measurements indicate nonlinear interactions between the cavities. This is a key step towards in-plane all-optical transistor action and circuitry. Such optical devices hold the promise of performing their operations faster than our current day devices by exploiting the ultrahigh oscillation frequency of light waves compared to today’s gigahertz-frequency electronic signals. In addition, the possible few-photon operation of these novel device structures could bring the required switching energies down to the attojoule level.