研究目的
Investigating the optical coupling between gate-defined quantum dots and photonic crystal nanocavities to enhance the efficiency of the quantum spin-photon interface.
研究成果
The study successfully demonstrated the fabrication of photonic crystal nanocavities with electrodes for gate-defined quantum dots, achieving a resonant mode at the target wavelength with minimal influence from the electrodes. This work lays a crucial foundation for future optical coupling between gate-defined quantum dots and photonic crystal nanocavities, enhancing the efficiency of the quantum spin-photon interface.
研究不足
The study did not account for quantum or exciton effects in the numerical estimation of optical absorption. The alignment accuracy and the influence of electrodes on the nanocavity modes were primary concerns, with potential areas for optimization in the fabrication process.
1：Experimental Design and Method Selection:
The study involved designing a photonic crystal nanocavity with electrodes for gate-defined quantum dots and using micro-photoluminescence spectroscopy to confirm the resonant mode.
2：Sample Selection and Data Sources:
The samples were fabricated on a GaAs/AlGaAs quantum well slab with electrodes introduced on the top surfaces of two-dimensional photonic crystal nanocavities.
3：List of Experimental Equipment and Materials:
The fabrication process included electron-beam lithography, reactive ion etching, and wet etching. Optical characterization was performed using a continuous wave laser and a Si CCD camera through a spectrometer.
4：Experimental Procedures and Operational Workflow:
The fabrication process involved precise positioning of electrodes on the photonic crystal nanocavity slab, followed by optical characterization to observe the resonant mode.
5：Data Analysis Methods:
The wavelength dependence of optical absorption was calculated using three-dimensional finite-difference time-domain method, and the quality factors of the nanocavity modes were estimated by fitting the cavity mode spectra by the Lorentz function.
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