[20a-A101-1~11] 3.10 Photonic structures and phenomena (formerly 3.11)

▼ [20a-A101-6] Demonstration of nanobeam photonic crystal nanocavities with improved Q-factor based on Er,O-codoped GaAs

〇(D)Zhidong Fang¹, Jun Tatebayashi¹, Hirotake Kajii¹, Masahiko Kondow¹, Yasufumi Fujiwara¹ (1.Osaka Univ.)

Keywords:GaAs, Er luminescence, photonic crystal

Quantum communication, storage, and computing show potential as the next-generation information technologies, and have been recently attracting scientific attention. Above all, controllable, stable, and repeatable single photon emitters (SPEs) have been of great significance as an important component of quantum information systems. In this contribution, we propose and demonstrate a nanobeam photonic crystal (PhC) to enhance the constraint effect on Er luminescence and emit the photons from the central defect to further improve the Q-factor towards the foundation for the implementation of SPEs. Numerical simulations of the PhC nanobeam cavities are carried out using the finite-difference time-domain (FDTD) method to investigate the effect of the geometry of the PhC nanocavities on the cavity modes and Q-factor, and a maximum design Q-factor of 1.3 × 10⁶ was obtained. PhC nanocavities with Er,O-doped GaAs as an active component are prepared, and their optical characterization is performed. Minimum half-peak width of 0.173 nm was observed, and the calculated experimental Q-factor up to 8×10³ was obtained. The observed sharp peak of the cavity modes with high Q-factor is expected to enhance Er emission and reduce the lifetime of Er luminescence after tuning.