研究目的
Investigating the degree of indistinguishability of single photons consecutively emitted by GaAs quantum dots obtained by local droplet etching and comparing different single-photon excitation mechanisms to achieve high indistinguishability.
研究成果
The study demonstrates that highly indistinguishable single photons can be obtained from GaAs quantum dots under strictly resonant and incoherent phonon-assisted excitation, with photon indistinguishabilities above 90%. The LO-phonon-assisted excitation scheme, in particular, allows straightforward laser rejection and is thus worth of further investigation and optimization for quantum dots embedded in high-brightness photonic structures.
研究不足
The study is limited by the slow relaxation times observed under excited-state excitation, which introduces a large time jitter in the photon emission. Additionally, the LO-phonon-assisted excitation scheme, while promising, competes with a slow decay path that may affect the photon indistinguishability.
1：Experimental Design and Method Selection:
The study compares different single-photon excitation mechanisms on GaAs quantum dots, including conventional excitation via excited states, strictly resonant excitation, and incoherent phonon-assisted excitation.
2：Sample Selection and Data Sources:
GaAs quantum dots obtained by local droplet etching of nanoholes in AlGaAs followed by GaAs filling were used.
3：List of Experimental Equipment and Materials:
The QD layer is placed at the center of a λ-cavity consisting of a λ/2-thick layer of Al
4：4Ga6As sandwiched between two λ/4-thick Al2Ga8As layers. A solid immersion lens is placed on top of the grown sample to enhance the external collection efficiency. Experimental Procedures and Operational Workflow:
The study involves photoluminescence excitation spectroscopy, time-correlated single-photon counting, Hanbury-Brown-Twiss measurements, and Hong-Ou-Mandel interference measurements under various excitation schemes.
5：Data Analysis Methods:
The data analysis includes fitting the decay dynamics with exponential functions, evaluating the visibility of the Hong-Ou-Mandel interference, and analyzing the spectral width of the LO-phonon resonance.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
