Nanometer-thick Au-films as antireflection coating for infrared light.
Opt Lett
; 32(11): 1578-80, 2007 Jun 01.
Article
em En
| MEDLINE
| ID: mdl-17546194
ABSTRACT
The optical properties of ultrathin Au films on silicon have been studied in the infrared over a wide frequency range from 200 to 10,000 cm(-1). Thick films show a Drude behavior; i.e., with increasing frequency the transmission increases; for films below the percolation threshold at about 5 nm a negative slope for the frequency-dependent transmission is observed. When the thickness is further reduced, between 1 and 3 nm an anomaly occurs the relative transmission reaches maximum values above 100% compared with the bare substrate, indicating an antireflection coating of nanometer thickness for light of 5 microm wavelength. This anomaly can be explained in the framework of effective-medium theories.
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Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2007
Tipo de documento:
Article