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Bright Purcell Enhanced Single-Photon Source in the Telecom O-Band Based on a Quantum Dot in a Circular Bragg Grating.
- Source :
-
Nano letters [Nano Lett] 2021 Sep 22; Vol. 21 (18), pp. 7740-7745. Date of Electronic Publication: 2021 Sep 03. - Publication Year :
- 2021
-
Abstract
- The combination of semiconductor quantum dots with photonic cavities is a promising way to realize nonclassical light sources with state-of-the-art performances regarding brightness, indistinguishability, and repetition rate. Here we demonstrate the coupling of InGaAs/GaAs QDs emitting in the telecom O-band to a circular Bragg grating cavity. We demonstrate a broadband geometric extraction efficiency enhancement by investigating two emission lines under above-band excitation, inside and detuned from the cavity mode, respectively. In the first case, a Purcell enhancement of 4 is attained. For the latter case, an end-to-end brightness of 1.4% with a brightness at the first lens of 23% is achieved. Using p-shell pumping, a combination of high count rate with pure single-photon emission (g <superscript>(2)</superscript> (0) = 0.01 in saturation) is achieved. Finally, a good single-photon purity (g <superscript>(2)</superscript> (0) = 0.13) together with a high detector count rate of 191 kcps is demonstrated for a temperature of up to 77 K.
Details
- Language :
- English
- ISSN :
- 1530-6992
- Volume :
- 21
- Issue :
- 18
- Database :
- MEDLINE
- Journal :
- Nano letters
- Publication Type :
- Academic Journal
- Accession number :
- 34478316
- Full Text :
- https://doi.org/10.1021/acs.nanolett.1c02647