2022年第83回応用物理学会秋季学術講演会

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3 光・フォトニクス » 3.10 フォトニック構造・現象(旧3.11)

[22p-P03-1~8] 3.10 フォトニック構造・現象(旧3.11)

2022年9月22日(木) 13:30 〜 15:30 P03 (体育館)

13:30 〜 15:30

[22p-P03-2] Design of a Defect-Based Photonic Crystal Nanobeam Cavity on a Silicon Nitride Waveguide for Efficient Generation of Single Photon by Resonant Excitation

Natthajuks Pholsen1,2、Yasutomo Ota3、Satoshi Iwamoto1,2 (1.RCAST, UTokyo、2.IIS, UTokyo、3.Keio Univ.)

キーワード:Single-photon sources, Quantum dot, Silicon nitride integrated photonics

We report a cavity design for InAs/GaAs quantum-dot single-photon source that can be resonantly excited with low crosstalk and efficiently coupled to an underlying SiN wire waveguide buried in glass. The design employs a GaAs photonic crystal (PhC) nanobeam cavity embedding a large defect region. Finite-difference-time-domain (FDTD) simulations show crosstalk can be suppressed to the order of 10-13, which would be sufficient for obtaining high-quality single photons.1 In addtion, with a novel strategy of matching the effective index of a section of PhC mirror with that of the underlying waveguide, we achieve coupling efficiency of more than 90% despite a large difference in refractive index of GaAs and SiN.
[1] M. N. Makhonin, et al., Nano Lett. 14, 6997–7002 (2014).