研究目的
Investigating the manipulation of waves in a microcavity to achieve unidirectional emission and its application in nanoparticle detection.
研究成果
The proposed microcavity-waveguide system demonstrates strong chirality and unidirectional emission under PT symmetry, with potential applications in nanoparticle detection. The system's performance is robust across a range of fabrication parameters, suggesting feasibility for experimental realization and integration into photonic circuits.
研究不足
The study is based on numerical simulations, and practical implementation may face challenges in fabricating the precise structures and controlling the gain-loss contrast required for PT symmetry. The sensitivity to external perturbations, while beneficial for sensing, may also introduce instability in practical applications.
1：Experimental Design and Method Selection:
The study employs numerical calculations based on the commercial finite-element-methods software (COMSOL MULTIPHYSICS
2：2A) to explore the interactions between twin microcavities and a waveguide under PT symmetry. Sample Selection and Data Sources:
The microcavities and waveguide are modeled with specific parameters, including refractive index and dimensions, to simulate the asymmetric coupling and chirality effects.
3：List of Experimental Equipment and Materials:
The simulation uses a perfectly matched layer (PML) to absorb outgoing waves and records far-field patterns (FFPs) for analysis.
4：Experimental Procedures and Operational Workflow:
The study involves varying the distance between the waveguide and microcavities and the intervals between the cavities to observe changes in chirality and emission patterns.
5：Data Analysis Methods:
The analysis includes calculating eigenfrequencies, field distributions, and angular momentum representations to characterize the chirality and emission properties.
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