Photon storage with sub-nanosecond readout rise time in coupled quantum wells

TL;DR

This paper demonstrates photon storage with a sub-nanosecond readout rise time in coupled quantum wells, achieved through impedance-matched gating that suppresses transient oscillations and enables rapid exciton energy switching.

Contribution

It introduces a method for fast photon storage and retrieval in CQWs with minimized transient effects using impedance-matched broadband transmission lines.

Findings

Achieved 250 ps readout rise time in photon storage.

Suppressed transient oscillations with impedance-matched gating.

Enabled rapid exciton energy switching shorter than exciton lifetime.

Abstract

Photon storage with 250 ps rise time of the readout optical signal was implemented with indirect excitons in coupled quantum well nanostructures (CQW). The storage and release of photons was controlled by the gate voltage pulse. The transient processes in the CQW were studied by measuring the kinetics of the exciton emission spectra after application of the gate voltage pulse. Strong oscillations of the exciton emission wavelength were observed in the transient regime when the gate voltage pulse was carried over an ordinary wire. Gating the CQW via an impedance-matched broadband transmission line has lead to an effective elimination of these transient oscillations and expedient switching of the exciton energy to a required value within a short time, much shorter than the exciton lifetime.