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HL: Fachverband Halbleiterphysik

HL 8: Poster Session II

HL 8.12: Poster

Dienstag, 28. September 2021, 10:00–13:00, P

Design and fabrication of waveguide-based nanobeam cavity for on-chip single photon source — •Yuhui Yang¹, Uğur Meriç Gür^1,2, Johannes Schall¹, Ronny Schmidt¹, Arsenty Kaganskiy¹, Michael Mattes², Samel Arslanagić², Stephen Reitzenstein¹, and Niels Gregersen³ — ¹Institut für Festkörperphysik, TU Berlin, Germany — ²Department of Electrical Engineering, Technical University of Denmark, Denmark — ³Department of Photonics Engineering, Technical University of Denmark , Denmark

In quantum technology, the two-photon interference acts as an important role related to the indistinguishability of single-photon. One approach to improve the indistinguishability of single-photon is to enhance the spontaneous emission into cavity mode by Purcell effect. In this regard, nanobeam cavities, are promising candidates because they can easily be integrated with other on-chip components. In this contribution, we optimize the geometrics of nanobeam cavities. A numerically optimized nanobeam cavity design yields a high directional spontaneous emission β factor of 0.73 with broadband enhancement of 9 nm. The nanobeam cavity containing embedded InGaAs/GaAs quantum dots fabricated structures demonstrates the cavity effect. By micro-photoluminescence (µPL) characterization, three distinct Fabry-Pérot resonance peaks as well as cavity effects are observed. Due to the Purcell enhancement from the cavity, the spontaneous emission rate of a resonance (non-resonance) peak is (1.59 * 0.09) ns⁻¹ [(1.14 * 0.14) ns⁻¹], indicating the potential of nanobeam cavity for full on-chip single-photon source.