[A-10] Integrated Photonic Devices

[A-10-03] Polarization-Independent Enhancement of Optical Absorption in a GaAs Quantum Well Embedded in an Air-bridge Bull’s-eye Cavity

〇Sangmin Ji¹, Takeyoshi Tajiri², Xiao-Fei Liu³, Haruki Kiyama^3,4, Akira Oiwa³, Julian Ritzmann⁵, Arne Ludwig⁵, Andreas Dirk Wieck⁵, Satoshi Iwamoto¹ (1. The Univ. of Tokyo (Japan), 2. Univ. of Electro-Communications (Japan), 3. Osaka Univ. (Japan), 4. Kyushu Univ. (Japan), 5. Ruhr-Universität Bochum (Germany))

Presentation style: On-site (in-person)

https://doi.org/10.7567/SSDM.2022.A-10-03

Bull’s-eye structures containing optically active media provide an attractive platform for implementing efficient photonic quantum interfaces. By exploiting their symmetric nature, we previously designed a bull’s-eye optical cavity that enhances the optical absorption without polarization dependence, which can be applied to an efficient photon–spin converter using a gate-defined quantum dot (GQD). In this correspondence, we experimentally demonstrate that our bull’s-eye cavity can enhance the optical absorption of a quantum well (QW) without polarization dependence. Photoluminescence excitation spectra from the fabricated cavities show the maximum 12-times enhancement of QW absorption. The enhancement is almost identical for orthogonal polarizations.