Fast electrical control of a quantum dot strongly coupled to a photonic-crystal cavity.
The resonance frequency of an InAs quantum dot strongly coupled to a GaAs photonic-crystal cavity was electrically controlled via the quadratic quantum confined Stark effect. Stark shifts up to 0.3 meV were achieved using a lateral Schottky electrode that created a local depletion region at the location of the quantum dot. We report switching of a probe laser coherently coupled to the cavity up to speeds as high as 150 MHz, limited by the RC constant of the transmission line. The coupling strength g and the magnitude of the Stark shift with electric field were investigated while coherently probing the system.
Faraon
Andrei
A
E. L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA. andrei.faraon@hp.com
Majumdar
Arka
A
Kim
Hyochul
H
Petroff
Pierre
P
Vucković
Jelena
J