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oe1(光电查) - 科学论文

2 条数据
?? 中文（中国） ▾

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

    摘要： 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 photo-charging 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.

    关键词： Optical nanofiber,Cryogenic temperatures,CdSe quantum dots,Photocharging,Trions

    更新于2025-09-23 15:21:01

  • Efficient fiber in-line single photon source based on colloidal single quantum dots on an optical nanofiber

    摘要： We demonstrate a fiber in-line single photon source based on a hybrid system of colloidal single quantum dots deposited on an optical nanofiber and cooled down to cryogenic temperature (3.7 K). We show that a charged state (trion) of the single quantum dot exhibits a photo-stable emission of single photons with high quantum efficiency, narrow linewidth (3 meV FWHM) and fast decay time ( 10.0 ± 0.5 ns). The single photons are efficiently coupled to the guided modes of the nanofiber and eventually to a single mode optical fiber. The brightness (efficiency) of the single photon source is estimated to be 16 ± 2% with a maximum photon count rate of 1.6 ± 0.2 MHz and a high single photon purity ( g2(0) = 0.11 ± 0.02 ). The device can be easily integrated to the fiber networks paving the way for potential applications in quantum networks.

    关键词： quantum dots,single photon source,quantum networks,optical nanofiber,cryogenic temperature

    更新于2025-09-19 17:13:59