Sub-wavelength energy concentration with electrically generated mid-infrared surface plasmons.
Opt Express
; 20(13): 13738-47, 2012 Jun 18.
Article
em En
| MEDLINE
| ID: mdl-22714439
ABSTRACT
While freely propagating photons cannot be focused below their diffraction limit, surface-plasmon polaritons follow the metallic surface to which they are bound, and can lead to extremely sub-wavelength energy volumes. These properties are lost at long mid-infrared and THz wavelengths where metals behave as quasi-perfect conductors, but can in principle be recovered by artificially tailoring the surface-plasmon dispersion. We demonstrate - in the important mid-infrared range of the electromagnetic spectrum - the generation onto a semiconductor chip of plasmonic excitations which can travel along long distances, on bent paths, to be finally focused into a sub-wavelength volume. The demonstration of these advanced functionalities is supported by full near-field characterizations of the electromagnetic field distribution on the surface of the active plasmonic device.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Refratometria
/
Ressonância de Plasmônio de Superfície
/
Modelos Teóricos
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article