研究目的
Investigating the light absorption enhancement of plasmonic based photo-detector with double nanograting structure for night vision applications.
研究成果
The proposed double nanograting based photodetector achieves a maximum LAEF of 2.2435 and a quenching factor of 92.14% at a SWA height of 60nm, making it suitable for night vision applications. The design demonstrates that both top and bottom grating layers contribute to enhanced light trapping, with the bottom layer minimizing light reflection and enhancing light absorption.
研究不足
The study focuses on rectangular groove shapes and specific materials (silver and GaAs). Future work could explore other groove shapes and materials for further light trapping enhancement.
1：Experimental Design and Method Selection:
The study uses a double nanograting structure for plasmonic based photodetector to enhance light absorption. The design includes top grating, subwavelength aperture (SWA), bottom grating, and substrate. Simulations are performed using OptiFDTD software based on Drude model.
2：Sample Selection and Data Sources:
The design uses silver for nanogratings and gallium arsenide (GaAs) as substrate. Light in the near infrared region (1.1 μm- 1.55 μm) with TM mode is used for simulations.
3：1 μm- 55 μm) with TM mode is used for simulations.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: OptiFDTD software, silver nanogratings, GaAs substrate.
4：Experimental Procedures and Operational Workflow:
The FDTD simulation uses a mesh size of 5 nm. Periodic boundary conditions along x direction and anisotropic perfectly matched layer (APML) in z direction are applied. The structure consists of parallel grooves in x-direction made from perfect conductors.
5：Data Analysis Methods:
Performance metrics include Quenching factor and Light absorption enhancement factor (LAEF), calculated using specific equations to analyze the design's efficiency.
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