研究目的
Investigating the efficient out-coupling of light from integrated nanophotonic circuits into optical fibres for scalable quantum information processing and photonic quantum networks.
研究成果
The fabricated spot-size converter demonstrates high efficiency in coupling light from GaAs waveguides to optical fibres, with potential applications in quantum information processing and photonic quantum networks. The compatibility of the epoxy polymer with cryogenic temperatures and the observation of single-photon emission are significant advancements.
研究不足
The study is limited by the fabrication precision of the inverted tapers and the compatibility of materials with cryogenic temperatures.
1：Experimental Design and Method Selection:
The study employs an inverted GaAs taper with an epoxy polymer cladding for adiabatic power transfer of the fundamental TE mode into a large-mode-area overlay cladding.
2：Sample Selection and Data Sources:
Suspended GaAs waveguides with embedded quantum dots are used.
3：List of Experimental Equipment and Materials:
Electron-beam lithography for patterning, hydrofluoric acid for undercutting, and a Helium bath cryostat for cooling.
4：Experimental Procedures and Operational Workflow:
The epoxy polymer is hard-baked before cleaving and undercut to leave a suspended coupler. QDs are excited above-band by a pulsed laser, and the signal is collected via a lensed fiber and analyzed with a spectrometer.
5：Data Analysis Methods:
Three-dimensional finite-element calculations for efficiency extraction and auto-correlation measurements for confirming single-photon emission.
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