利用瑞利异常表面等离激元极化激元调整金膜中纳米孔阵列的传感能力。

Tailoring the sensing capabilities of nanohole arrays in gold films with Rayleigh anomaly-surface plasmon polaritons.

作者信息

McMahon Jeffrey M, Henzie Joel, Odom Teri W, Schatz George C, Gray Stephen K

机构信息

Chemistry Division and Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA.

出版信息

Opt Express. 2007 Dec 24;15(26):18119-29. doi: 10.1364/oe.15.018119.

DOI:10.1364/oe.15.018119

PMID:19551110

Abstract

Surface plasmon polaritons (SPPs) and diffraction effects such as Rayleigh anomalies (RAs) play key roles in the transmission of light through periodic subwavelength hole arrays in metal films. Using a combination of theory and experiment we show how refractive index (RI) sensitive transmission features arise from hole arrays in thin gold films. We show that large transmission amplitude changes occur over a narrow range of RI values due to coupling between RAs and SPPs on opposite sides of the metal film. Furthermore, we show how to predict, on the basis of a relatively simple analysis, the periodicity and other system parameters that should be used to achieve this "RA-SPP" effect for any desired RI range.

摘要

表面等离激元极化激元（SPPs）以及诸如瑞利异常（RAs）等衍射效应在光透过金属薄膜中的周期性亚波长孔阵列的传输过程中起着关键作用。通过理论与实验相结合的方法，我们展示了薄金膜中的孔阵列如何产生对折射率（RI）敏感的传输特性。我们表明，由于金属膜相对两侧的RAs与SPPs之间的耦合，在较窄的RI值范围内会出现较大的传输幅度变化。此外，我们还展示了如何基于相对简单的分析来预测对于任何所需RI范围实现这种“RA - SPP”效应应使用的周期性及其他系统参数。