Multiple time scale blinking in InAs quantum dot single-photon sources

摘要

We use photon correlation measurements to study blinking in single,epitaxially-grown self-assembled InAs quantum dots situated in circular Bragggrating and microdisk cavities. The normalized second-order correlationfunction g(2)(\tau) is studied across eleven orders of magnitude in time, andshows signatures of blinking over timescales ranging from tens of nanosecondsto tens of milliseconds. The g(2)(\tau) data is fit to a multi-level systemrate equation model that includes multiple non-radiating (dark) states, fromwhich radiative quantum yields significantly less than 1 are obtained. Thisbehavior is observed even in situations for which a direct histogramminganalysis of the emission time-trace data produces inconclusive results.