研究目的
To propose a simple simulation framework for high-contrast gratings (HCGs) by drawing an analogy with bimodal Fabry–Pérot interferometers, enabling the exploration of the device parameter space and explaining ultra-broadband quasi-100% reflectivity.
研究成果
The bimodal FPI framework provides a simple and efficient way to design and analyze HCG reflectors, offering insights into their broadband operation and enabling the exploration of their parameter space. The model is also applicable to lossy gratings, maintaining its effectiveness for realistic structures.
研究不足
The study assumes lossless materials initially but extends the model to include losses in the bulk of the bars, showing that the general structure of the response remains unchanged with reasonable losses. However, very high losses drastically modify the response, making the device no longer useful.
1：Experimental Design and Method Selection:
The study employs a modal method approach, representing the electromagnetic field as a superposition of the modes of a periodic waveguide, to describe propagation along the longitudinal direction by closed-form expressions.
2：Sample Selection and Data Sources:
The analysis focuses on HCGs with dielectric bars surrounded by air or deposited on a low-index material.
3：List of Experimental Equipment and Materials:
The study utilizes high-contrast gratings characterized by refractive index nb, surrounded by an index nout and lying on an index nin.
4：Experimental Procedures and Operational Workflow:
The methodology involves a parametric analysis of HCGs using rigorous coupled wave analysis (RCWA) and the proposed bimodal FPI model.
5：Data Analysis Methods:
The analysis includes the computation of reflectivity spectra and the exploration of the device parameter space using the proposed model.
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