SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 7: Poster I

HL 7.45: Poster

Monday, March 27, 2023, 13:00–15:00, P2/EG

Enhancing the extraction efficiency of photons from low intensity decay processes with solid immersion lenses — •Patricia Kallert¹, Björn Jonas², Eva Schöll¹, Tim Langer¹, Dirk Reuter¹, Artur Zrenner¹, and Klaus D. Jöns¹ — ¹hqpd lab, PhoQS Institute and Department of Physics, Paderborn University, Germany — ²Photonic Quantum Engineering Group, Walter Schottky Institute, and Department for Electrical and Computer Engineering, Technical University of Munich, Germany

Single photons are basic building blocks for photon-based quantum technologies, such as quantum computation and communication concepts. A promising source offering high single-photon purity and indistinguishability are semiconductor quantum dots in photodiodes. A major drawback of this platform is the low extraction efficiency. Due to the refractive index mismatch of the semiconductor and the surrounding environment, total internal reflection occurs already for very small angles of incidence on the interface. In this study, the enhancement capability and the practical limits of using solid immersion lenses of hemispherical and Weierstrass geometry are investigated and compared. The hemispherical lens is insusceptible to misalignment but offers a mediocre enhancement in collection efficiency. In contrast, the Weierstrass geometry is sensitive to nonperfect alignment but improves the extraction by a factor of up to 2.9. Avoiding the need of the fabrication of complex structures as micropillars and other cavities, consequently, we can triple the detection of photons from low-intensity decay processes.