Author(s): Liu, HQ (Liu, Hanqing); Li, SL (Li, Shulun); Shang, XJ (Shang, Xiangjun); Huang, JH (Huang, Junhui); Liu, SF (Liu, Shunfa); Su, XB (Su, Xiangbin); Sun, BQ (Sun, Baoquan); Dai, DY (Dai, Deyan); Zhang, Y (Zhang, Yu); Liu, B (Liu, Bing); Liu, J (Liu, Jin); Ni, HQ (Ni, Haiqiao); Niu, ZC (Niu, Zhichuan)

Source: APPLIED PHYSICS LETTERS Volume: 124 Issue: 4  Article Number: 041102  DOI: 10.1063/5.0172521  Published: JAN 22 2024 

Abstract: We present a broadband enhanced single photon source device of Gaussian-shaped GaAs microlens (ML) arrays coupled with a gold bottom mirror hybrid structure. The extrapolated light extraction efficiency of (60.6 +/- 1.5)% at maximum (for collection numerical aperture = 0.45 and based on the an actually measured raw detection efficiency of similar to 0.775%) and a broad spectral band of 890-960 nm were obtained. The ML-Au structure with embedded epitaxial quantum dots exhibits a high single-photon purity of (96.6 +/- 0.7)% [g((2))(0) = 0.034 +/- 0.003] under pulsed excitation with 20% saturation. Wet-etched microlenses with smooth surfaces achieve simultaneous enhancement of both XX and X exciton emissions, which is prerequisite for promising entangled photon pair generation. This work proposes the bright potential of integrated hybrid structures to enable further photon pair entanglement applications.

Accession Number: WOS:001147697300017

Author Identifiers:

Author Web of Science ResearcherID     ORCID Number

Li, Shulun       0000-0001-5894-9436

ISSN: 0003-6951

eISSN: 1077-3118