研究目的
To realize a surface plasmon resonance-enhanced zinc oxide (ZnO) ultraviolet photodetector based on a sub-wavelength metal grating, taking advantage of the sensitivity of the resonance condition of a sub-wavelength metal grating to the refractive index of the surrounding medium.
研究成果
The designed ZnO ultraviolet photodetector with a sub-wavelength Ag grating covered with a high-refractive-index medium layer successfully realizes the surface plasmon resonance effect, achieving a maximum absorption enhancement factor of 108. This provides theoretical guidance for the development of surface plasmon resonance-enhanced ultraviolet photodetectors.
研究不足
The study is theoretical and relies on simulations. Practical realization may face challenges in finding materials that meet the required high refractive index without absorbing the incident ultraviolet light.
1：Experimental Design and Method Selection:
The study involves the theoretical design of a sub-wavelength Ag grating covered with a high-refractive-index medium layer applied to a ZnO ultraviolet photodetector. The COMSOL Multiphysics software was used for simulation.
2：Sample Selection and Data Sources:
The simulation setup included parameters such as metal grating period, incident angle of light, grating spacing, grating thickness, thickness of the high-refractive-index medium layer, and the refractive index of the high-refractive-index medium layer.
3：List of Experimental Equipment and Materials:
The device structure consisted of a high-refractive-index medium layer, a sub-wavelength Ag grating, and a ZnO film.
4：Experimental Procedures and Operational Workflow:
The simulation involved varying parameters to optimize the absorption enhancement factor.
5：Data Analysis Methods:
The absorption enhancement factor was defined as the ratio of the normalized power transmittance of the designed structure to that without the high-refractive-index medium layer.
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