| Summary: | 碩士 === 國立宜蘭大學 === 電子工程學系碩士班 === 105 === Following the arrival of the nanoscale age, optical components have been miniaturized to nanoscopic scales. Nanoscale lenses are plasmonic lenses that are primarily made of metal. The surface plasmon effect, produced by plasma between metals and a dielectric surface, improves the focal points of lenses. In this study, a novel method to create plasmonic lenses by changing the space between slits is proposed. To validate this method, the finite difference time domain function in computer software was used for simulations and testing.
First, due to the lack of a formula for the spacing between slits, we consulted structures developed in other studies. Multiple experiments were conducted to compare focal point locations and intensities; the currently best results are described in this study.
The emphasis of the experiment was the focal point. The wavelengths used were in the red band of the visible spectrum. For visible wavelengths, silver is the most common material used in simulations. Therefore, silver was used in the preliminary experiments. Subsequently, other metals were tested using software simulations to design the structure. In order to perform tests and comparison, two parameters were changed: the width and lengths of the slits were fixed, and the spacing between slits was variable. To simplify calculations, the slits were placed in a linear arrangement, so that the point with the highest focus of light were compared. Sampled values were used to compare two different lenses and confirm that the proposed method can be used to create plasmonic lenses.
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