Optical spectroscopy of nanometric holes in thin gold films
Optical spectroscopy of nanometric holes in thin gold films
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DOI：
10.1021/nl0497171
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发表时间：
2004-06-01
期刊：
影响因子：
10.8
通讯作者：
Kall, M
中科院分区：
文献类型：
--
作者：
Prikulis, J;Hanarp, P;Kall, M
弹性散射测量表明，光学薄膜中孤立的纳米空穴在红外区和近红外区表现出局域表面等离子体共振。与偶极粒子等离子体激元类似，空穴等离子体激元红移随着孔洞直径的增大或周围介质折射率的增大而移动。当孔间距离减小时，观察到明显的蓝移，这表明介电平坦薄膜表面的表面等离子体激元增强了孔间的耦合。
Elastic scattering measurements show that isolated nanometric holes in optically thin Au films exhibit a localized surface plasmon resonance in the red to near-infrared region. The hole plasmon red shifts with increasing hole diameter or increasing refractive index of the surrounding medium, analogous to a dipolar particle plasmon. A pronounced blue shift is observed when the distance between holes is decreased, indicating an enhanced coupling between holes mediated by surface plasmon polaritons of the intervening flat film surface.