Effect of film thickness and dielectric environment on optical transmission through subwavelength holes
Entidad
UAM. Departamento de Física Teórica de la Materia CondensadaEditor
The American Physical SocietyFecha de edición
2012-01-12Cita
10.1103/PhysRevB.85.035417
Physycal Review B 85.3 (2012): 035417
ISSN
1098-0121 (print); 1550-235X (online)DOI
10.1103/PhysRevB.85.035417Financiado por
We acknowledge support from the Spanish Ministry of Science and Innovation (Projects MAT2008-06609-C02 and CSD2007-046-Nanolight.es)Versión del editor
http://dx.doi.org/10.1103/PhysRevB.85.035417Materias
FísicaDerechos
© 2012 American Physical SocietyResumen
We present a detailed theoretical study for the spectral position of transmission resonances appearing in isolated
subwavelength apertures in metallic films. We provide analytical expressions for the resonant wavelength as a
function of the film thickness and the dielectrics surrounding (and filling) the system that are valid for hole
shapes supporting large-cutoff wavelengths and for both isolated and periodically arranged holes. Our results
are quantitatively valid in the microwave and terahertz regimes, but they also have qualitative validity in the
optical regime. Our results show that for unfilled holes, in the limiting case when the hole is in a very thin
film (metal thickness much smaller than the wavelength), the transmission resonance is controlled by a length
scale related to the vanishing of the effective admittance of vacuum, as seen from the hole. On the contrary,
for metal thicknesses larger than half the wavelength, the transmission resonance is controlled by the cutoff of
the fundamental waveguide mode inside the hole. When thin films and high-index dielectrics are combined, the
spectral location of the maximum transmission can be strongly redshifted compared to the cutoff wavelength of
the apertures, and transmission intensity is substantially enhanced
Lista de ficheros
Google Scholar:Carretero Palacios, Sol
-
García Vidal, Fco. José
-
Martín-Moreno, L.
-
Rodrigo, Sergio G.
Lista de colecciones del ítem
Registros relacionados
Mostrando ítems relacionados por título, autor, creador y materia.