研究目的
To demonstrate actively tunable mid-infrared Fano resonance in Ge2Sb2Te5-based grating structures for applications in sensing, imaging, and detection.
研究成果
Fano resonance can be achieved and tuned in GST-based grating structures in the mid-infrared region. Non-volatile tuning is possible through phase changes in GST, geometric parameter adjustments, and external stimuli like temperature. The structure shows high sensitivity for sensing applications and potential for high-resolution filters.
研究不足
The study is based on numerical simulations using RCWA; experimental validation is not provided. The tuning range and performance may be limited by material properties and fabrication constraints. Applications are focused on the mid-infrared region.
1：Experimental Design and Method Selection:
The study uses a grating waveguide structure with a Ge2Sb2Te5 (GST) layer. The rigorous coupled-wave analysis (RCWA) method is employed to numerically investigate optical reflection and field distribution.
2：Sample Selection and Data Sources:
The structure consists of a barium fluoride (BaF2) grating on a BaF2 substrate coated with GST thin layers. Permittivity data for GST in amorphous and crystalline phases are used.
3：List of Experimental Equipment and Materials:
Materials include GST (phase-change material), BaF2 (for grating and substrate). No specific equipment brands or models are mentioned.
4：Experimental Procedures and Operational Workflow:
Simulations are performed with varying geometric parameters (grating period, ridge width, thickness, GST layer thickness), phase states of GST (amorphous proportion M), incident angle, and temperature. Reflection spectra and electric field distributions are calculated.
5：Data Analysis Methods:
Quality-factor (Q-factor) is defined and calculated. Sensitivity for refractive index sensing is computed.
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