Author(s): Shang, XJ (Shang Xiang-Jun); Li, SL (Li Shu-Lun); Ma, B (Ma Ben); Chen, Y (Chen Yao); He, XW (He Xiao-Wu); Ni, HQ (Ni Hai-Qiao); Niu, ZC (Niu Zhi-Chuan)

Source: ACTA PHYSICA SINICA Volume: 70 Issue: 8 Article Number: 087801 DOI: 10.7498/aps.70.20201605 Published: APR 20 2021

Abstract: Semiconductor quantum dot (QD) at low temperature will create excitons with sharp spectral lines for single photon emission. Optical fiber coupling avoids scanning for positioning and vibration influence in low-temperature confocal setup, and is a key technology in realizing the plug-play and componentization of QD single photon sources. For the fiber coupling techniques, the lateral coupling of a photonic crystal cavity or waveguide with a tapered fiber, or normal coupling of a QD chip with a tapered facet fiber in a large numerical aperture has been developed based on mask in a micro-region; however, the above techniques require multidimensional precise adjusting in order to avoid abnormally bending a soft fiber to realize alignment and high-efficiency coupling. Ceramic ferrule or silica V-shaped groove-mounted fiber has a large smooth facet and no bending; it can collect light in the normal direction by being aligned with bonding QD chip; V-shaped groovemounted fiber array also enables a random adhesion and avoid scanning for alignment, which is simple in technique. This work is based on the previous realization of single photon output by random adhesion of few-pair DBR micropillar chip with V-shaped groove-mounted fiber array, and uses many-pair DBR cavity chip with theoretical simulation optimization to improve the normal light extraction and its fiber collection efficiency, and greatly improves the fiber output of single photon count rate.

Accession Number: WOS:000643680000038

ISSN: 1000-3290

Full Text: http://wulixb.iphy.ac.cn/article/doi/10.7498/aps.70.20201605