Description of the modes governing the optical transmission through metal gratings.
Opt Express
; 19(5): 4740-55, 2011 Feb 28.
Article
in En
| MEDLINE
| ID: mdl-21369305
ABSTRACT
An analytical model based on a modal expansion method is developed to investigate the optical transmission through metal gratings. This model gives analytical expressions for the transmission as well as for the dispersion relations of the modes responsible for high transmission. These expressions are accurate even for real metals used in the visible - near-infrared wavelength range, where surface plasmon polaritons (SPP's) are excited. The dispersion relations allow the nature of the modes to be assessed. We find that the transmission modes are hybrid between Fabry-Pérot like modes and SPP's. It is also shown that it is important to consider different refractive indices above and below the gratings in order to determine the nature of the hybrid modes. These findings are important as they clarify the nature of the modes responsible for high transmission. It can also be useful as a design tool for metal gratings for various applications.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Refractometry
/
Pattern Recognition, Automated
/
Metals
/
Models, Theoretical
Type of study:
Prognostic_studies
Language:
En
Journal:
Opt Express
Journal subject:
OFTALMOLOGIA
Year:
2011
Document type:
Article
Affiliation country:
Switzerland