Occurrence control of charged exciton for a single CdSe quantum dot at cryogenic temperatures on an optical nanofiber

K. Muhammed Shafi, Kazunori Iida, Emi Tsutsumi, Akiharu Miyanaga, Kohzo Hakuta*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We discuss photo-luminescence characteristics of CdSe core/shell quantum dots at cryogenic temperatures using a hybrid system of a single quantum dot and an optical nanofiber. The key point is to control the emission species of quantum dot to charged excitons, known as trions, which have superior characteristics to neutral excitons. We investigate the photocharging behavior for the quantum dots by varying the wavelength and intensity of irradiating laser light, and establish a method to create a permanently charged situation which lasts as long as the cryogenic temperature is maintained. The present photocharging method may open a new route to applying the CdSe quantum dots in quantum photonics, and the hybrid system of photocharged quantum-dot and optical nanofiber may readily be applicable to a fiber-in-line single-photon generator.

Original languageEnglish
Article number68
JournalApplied Physics B: Lasers and Optics
Volume126
Issue number4
DOIs
Publication statusPublished - 1 Apr 2020
Externally publishedYes

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