請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/33107
標題: | 超越駐波模型:
一種對幾何形狀無相依的超穎物質 Beyond standing wave model: a novel metamaterial with unusual tolerance on geometry |
作者: | Chiang-Sheng Wu 吳強生 |
指導教授: | 陳正弦 |
關鍵字: | 超穎物質,駐波模型,表面電漿,負折射率, Metamaterials,standing wave model,surface plasmon,negative refractive index, |
出版年 : | 2011 |
學位: | 碩士 |
摘要: | Magnetic resonances are essential for achieving negative permeability and play important roles in realizing negative refraction phenomena. Surface plasmonic resonances confined in metallic nanostructures (i.e. metamaterials) are known to exhibit magnetic resonances that can be tailored by the structural geometries. In the past, researchers utilized standing wave model to explain the resonant frequencies of simply-connected metamaterials. Based on this model, the resonant frequencies of a metamaterial are inversely proportional to its structural length. In this work, we find that for a multiply-connected metamaterial, its resonant frequencies can largely deviate from the standing wave model. Remarkably, when the longest or the total length of the metamaterial is fixed, we find that the resonant frequency shows linear dependence on the circumference of the enclosed loop, an unusual phenomenon clearly violates the standing wave model. We also find that self-interactions can affect the frequency vs. length relationships in metamaterials. Importantly, when there is a balance between these effects, we discover a metamaterial whose resonant frequency is independent of its shape, length, or even the constituent materials. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/33107 |
全文授權: | 有償授權 |
顯示於系所單位: | 物理學系 |
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