نوع مقاله : علمی-پژوهشی
نویسندگان
1 دانشکده مهندسی برق و کامپیوتر، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران
2 گروه مخابرات، دانشکده مهندسی برق و کامپیوتر، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
In this paper, benefiting from the concept of Fano resonance, a novel metasurface is designed that is capable of performing the second-order derivative mathematical operator at optical frequencies on an input signal or image without any need for bulky lenses. The structure of this metasurface consists of a single-layer triangular array composed of equilateral triangular cavities created in a substrate of silicon. The transfer function required for a metasurface that can derive from the electric field of the radiation wave is presented. Based on these formulations, the process of designing the metasurface to achieve the desired transfer function is described. Then, by applying different input signals to the metasurface, it will be shown that the second derivative of the input signals is created in the output. Finally, by applying different images to the metasurface input, the results of optical image edge detection are presented in the analog domain. The introduced metasurface can be placed directly in front of a standard CCD image sensor and employed as an efficient and fast spatial filter in image processing applications.
کلیدواژه‌ها [English]
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