A broadband high-brightness quantum-dot double solid immersion lens single photon source

• Published in: APL photonics 2023-03, Vol.8 (3), p.036102-036102-6
• Main Authors: Ahn, D. H., Jang, Y. D., Baek, J. S., Park, S. I., Song, J. D., Lee, D.
• Format: Article
• Language: English
• ISSN: 2378-0967; 2378-0967
• DOI: 10.1063/5.0132161

High-brightness single photon sources (SPSs) are key components for practical quantum information processing systems. Although the performances of recently reported high-brightness SPSs are excellent, it remains challenging to match the emission wavelength of a quantum dot (QD) to the cavity since the high-Q cavity structures have narrow spectral bandwidths. Here, we propose a highly bright and broadband QD SPS that can be deterministically fabricated with a simple yet precise method. The optimized GaAs-polymer double solid immersion lens structure is capable of a brightness of 88% at 0.5 NA and has an operation band of 65 nm with a brightness of over 80% from numerical simulations. Experimentally, we achieved a brightness of 51.6% ± 2% and pure single photon emission [g(2)(0) = 0.029 ± 0.005] at saturation. We believe that our result can pave the way to a practical high-brightness QD SPS, considering its simple QD geometry together with its low cost and precise deterministic fabrication without using expensive and complicated e-beam lithography and dry etching processes.