Enhanced surface-plasmon resonance absorption in metal-dielectric-metal layered microspheres

被引：21

作者：

Hasegawa, K ^{[1
]}

Rohde, C ^{[1
]}

Deutsch, M ^{[1
]}

机构：

[1] Univ Oregon, Dept Phys, Eugene, OR 97403 USA

来源：

OPTICS LETTERS | 2006年 / 31卷 / 08期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1364/OL.31.001136

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We present a theoretical study of the dispersion relation of surface-plasmon resonances of mesoscopic metal-dielectric-metal microspheres. By analyzing the solutions to Maxwell's equations, we obtain a simple geometric condition for which the system exhibits a band of surface-plasmon modes whose resonant frequencies are weakly dependent on the multipole number. Using a modified Mie calculation, we find that a large number of modes belonging to this flat-dispersion band can be excited simultaneously by a plane wave, thus enhancing the absorption cross section. We demonstrate that the enhanced absorption peak of the sphere is geometrically tunable over the entire visible range. (c) 2006 Optical Society of America.

引用

页码：1136 / 1138

页数：3

共 15 条

[1] NEW IMPROVEMENTS FOR MIE SCATTERING CALCULATIONS [J].