研究目的
To present how coupling guided modes with orthogonal dominant polarizations in photonic crystal waveguides allows anomalous zero-group-velocity and prominent circular polarization to emerge, enhancing uni-directional photon emission.
研究成果
The study demonstrates that coupling modes with orthogonal polarizations in non-symmorphic photonic crystal waveguides enables the emergence of anomalous zero-group-velocity points and enhanced circular polarization, leading to high slow-down factors (ng>200) and strong chirality. This approach improves upon limitations of using band-edge points and shows promise for efficient uni-directional photon emission in chiral quantum photonics circuits using silicon-based devices.
研究不足
The paper does not explicitly mention specific limitations, but potential areas for optimization could include the fabrication precision, scalability of the design, and integration with quantum dots for practical applications in quantum information processing.
1：Experimental Design and Method Selection:
The study involves designing photonic crystal waveguides (PCWs) with broken parity symmetry to induce coupling between modes with orthogonal polarizations, leading to anomalous zero-group-velocity (aZGV) points and circular polarization. Theoretical analysis and 3D Finite-Difference-Time-Domain (FDTD) simulations are used to model the bandstructure and field properties. Fabricated devices are tested to confirm coupling and slow-light effects.
2：Sample Selection and Data Sources:
Samples include suspended 220nm thick Silicon PCWs fabricated on Silicon-On-Insulator (SOI) wafers with a lattice constant a=450nm. Data is obtained from simulations and experimental measurements on these devices.
3：List of Experimental Equipment and Materials:
Silicon-On-Insulator (SOI) wafers, fabricated photonic crystal waveguides, equipment for transmission measurements (specific models not mentioned).
4：Experimental Procedures and Operational Workflow:
Design PCWs with non-symmorphic symmetry by shifting one side of the photonic crystal by a/2. Perform 3D-FDTD simulations to calculate bandstructures and field profiles. Fabricate devices and measure transmission spectra to observe mini-stop bands and slow-down factors.
5：Perform 3D-FDTD simulations to calculate bandstructures and field profiles. Fabricate devices and measure transmission spectra to observe mini-stop bands and slow-down factors.
Data Analysis Methods:
5. Data Analysis Methods: Analyze bandstructures to identify aZGV points, calculate field components and relative phases to locate circular polarization points, and measure group indices from transmission spectra.
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