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Effect of groove periodicity on the enhanced transmission through a single subwavelength slit

Authors :
Wei-Ping Zang
Jian-Guo Tian
Zhi-Bo Liu
Wen-Yuan Zhou
Zu-Bin Li
Source :
Journal of the Optical Society of America B. 23:1517
Publication Year :
2006
Publisher :
The Optical Society, 2006.

Abstract

Transmission through a single subwavelength slit surrounded by nonperiodic or approximately periodic grooves in perfect conductive film has been analyzed numerically by the finite-difference time-domain method. Results show that the periodicity of the grooves is not the necessary condition to enhance the transmission, but is sufficient to obtain high enhancement. A spectrum with low enhancement and multiple peaks is obtained through a slit with nonperiodic grooves that is due to the resonances at different wavelengths caused by nonperiodicity. The spectrum of a slit with approximately periodic grooves is almost similar to that of a slit with absolutely periodic grooves regardless of whether the grooves are symmetric with respect to the slit, especially when the deflection of the grooves is very small compared to the grooves' period.

Details

ISSN :
15208540 and 07403224
Volume :
23
Database :
OpenAIRE
Journal :
Journal of the Optical Society of America B
Accession number :
edsair.doi...........6d90e1b70938dc46182494ebd4a95e24
Full Text :
https://doi.org/10.1364/josab.23.001517