Efficient optical coupling into metal-insulator-metal plasmon modes with subwavelength diffraction gratings

被引：32
|
作者：
Preiner, Michael J. [1 ]
Shimizu, Ken T. [1 ]
White, Justin S. [1 ]
Melosh, Nicholas A. [1 ]
机构：
[1] Stanford Univ, Geballe Lab Adv Mat, Stanford, CA 94305 USA
来源：
APPLIED PHYSICS LETTERS | 2008年 / 92卷 / 11期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1063/1.2898509
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We demonstrate efficient optical coupling into metal-insulator-metal (MIM) plasmon modes. Subwavelength grating couplers are used to optically excite the MIM plasmon mode, which is observed with reflection spectroscopy. Coupling efficiencies of up to 28% are measured for insulator thicknesses of 12 nm. It is found that the MIM resonance has a significant shift in energy as a function of grating depth. This shift is much larger than that seen from traditional surface plasmon modes. MIM plasmons are promising tools for probing molecular junctions due to strong field confinement and high field intensities within the insulator. (C) 2008 American Institute of Physics.
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