All-optical switching with a biexcitonic double lambda system

A double lambda four-level system could be implemented with biexcitonic transitions on GaAs quantum well. We observed that the phase dependent biexcitonic transition could be explained by interference between one-photon and three-photon transition in a double lambda four-level system. An ultralow-light switch pulse could control 80% of biexcitonic absorption, which demonstrated all-optical switching with biexcitonic double lambda system.

Research Highlights
► Phase dependent biexcitonic transition by interference in a double lambda four-level system.
► Ultralow-light switch pulse controls 80% of biexcitonic absorption.
► Application to optical communication technology for ultra fast switching with semiconductor.