Optical properties of a nanosized hole in a thin metallic film.
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.
Park
Tae-Ho
TH
Department of Physics and Astronomy, M.S. 61, Laboratory for Nanophotonics, Rice University, Houston, Texas 77005-1892, USA.
Mirin
Nikolay
N
Lassiter
J Britt
JB
Nehl
Colleen L
CL
Halas
Naomi J
NJ
Nordlander
Peter
P