Optical properties of a nanosized hole in a thin metallic film

作者：Park Tae Ho; Mirin Nikolay; Lassiter J Britt; Nehl Colleen L; Halas Naomi J; Nordlander Peter^*

来源：ACS Nano, 2008, 2(1): 25-32.

DOI：10.1021/nn700292y

Subwavelength holes are one of the most important structures in nanophotonics, providing a useful geometry for nanosensing and giving rise to extraordinary transmission when patterned in arrays. Here we theoretically and experimentally examine the optical properties of an individual nanohole in a thin metallic film. In contrast to localized plasmonic nanostructures with their own characteristic resonances, nanoholes provide a site for excitation of the underlying thin film surface plasmons. We show that both hole diameter and film thickness determine the energy of the optical resonance. A theoretical dispersion curve was obtained and verified using spectral measurements of individual nanoholes.

• 出版日期2008-1