Excitonic switches at 100 K temperatures

TL;DR

This paper demonstrates excitonic switching devices operating at around 100 K, a significant temperature increase over previous devices, highlighting their potential for high-speed, integrated optoelectronic circuits.

Contribution

The authors experimentally prove excitonic switches can operate at 100 K using AlAs/GaAs quantum wells, surpassing prior low-temperature limitations.

Findings

Operates at ~100 K, much higher than previous 1.5 K devices

Uses AlAs/GaAs coupled quantum well structures

Includes devices like EXOT, EXBM, and EXPOM

Abstract

Photonic and optoelectronic devices may offer the opportunity to realize efficient signal processing at speeds higher than in conventional electronic devices. Switches form the building blocks for circuits and fast photonic switches have been realized [1,2,3,4,5,6]. Recently, proof of principle of exciton optoelectronic devices was demonstrated [7,8]. Potential advantages of excitonic devices include high operation and interconnection speed, small dimensions, and the opportunity to combine many elements into integrated circuits. Here, we demonstrate experimental proof of principle for the operation of excitonic switching devices at temperatures around 100 K. The devices are based on an AlAs/GaAs coupled quantum well structure and include the exciton optoelectronic transistor (EXOT), the excitonic bridge modulator (EXBM), and the excitonic pinch-off modulator (EXPOM). This is a two orders of magnitude increase in the operation temperature compared to the earlier devices, where operation was demonstrated at 1.5 K [7,8].