研究目的
To demonstrate asymmetric light transmission through a compact photonic crystal structure that sustains semi-Dirac cone dispersion, using numerical and experimental methods.
研究成果
The study successfully demonstrates asymmetric light transmission through a compact photonic crystal structure with semi-Dirac cone dispersion, achieving high transmission efficiency in one direction and significantly lower in the opposite. Experimental results in the microwave regime validate the numerical findings, showing good agreement.
研究不足
The study is limited to the microwave regime and specific structural parameters of the photonic crystal. The optimization algorithm may not explore the entire solution space, potentially missing global optima.
1：Experimental Design and Method Selection:
The study employs the plane-wave expansion method for designing a PC structure with semi-Dirac cone dispersion and integrates the finite-difference time-domain method with a differential evolution algorithm for optimization.
2：Sample Selection and Data Sources:
The PC structure consists of a rectangular lattice of cylindrical dielectric rods in an air environment, with specific permittivities and dimensions.
3：List of Experimental Equipment and Materials:
Alumina rods with a permittivity of εrod =
4：80 are used in the microwave regime experiments. Experimental Procedures and Operational Workflow:
The optimization process involves iteratively adjusting the positions of dielectric rods to maximize transmission efficiency in one direction and minimize it in the opposite.
5：Data Analysis Methods:
Transmission efficiencies are calculated and compared for forward and backward directions to evaluate the asymmetric light transmission effect.
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