Author(s): Chen, H (Chen, Hao); Huang, JH (Huang, Junhui); He, XW (He, Xiaowu); Ding, K (Ding, Kun); Ni, HQ (Ni, Haiqiao); Niu, ZC (Niu, Zhichuan); Jiang, DS (Jiang, Desheng); Dou, XM (Dou, Xiuming); Sun, BQ (Sun, Baoquan)

Source: ACS PHOTONICS Volume: 7 Issue: 11 Pages: 3228-3235 DOI: 10.1021/acsphotonics.0c01311 Published: NOV 18 2020

Abstract: We report a new way to slow down the spontaneous emission rate of excitons in the wetting layer (WL) through radiative field coupling between the exciton emissions and the dipole field of metal islands. As a result, a long-lifetime decay process is detected in the emission of InAs/GaAs single quantum dots (QDs). It is found that when the separation distance from the WL layer (QD layer) to the metal islands is around 20 nm and the islands have an average size of approximately 50 nm, the QD lifetime may change from approximately 1 to 160 ns. The corresponding second-order autocorrelation function g((2))(tau) changes from antibunching into a bunching and antibunching characteristics due to the existence of long-lived metastable states in the WL. This phenomenon can be understood by treating the metal islands as many dipole oscillators in the dipole approximation, which may cause destructive interference between the exciton dipole field and the induced dipole field of the metal islands.

Accession Number: WOS:000592916800032

ISSN: 2330-4022

Full Text: https://pubs.acs.org/doi/10.1021/acsphotonics.0c01311