Enhanced optical transmission by V-shaped nanoslit in metal film

doi:10.1088/1674-1056/22/11/114201

Abstract In this paper, we reveal that the enhanced transmission through a perforated metal film can be further boosted up by a V-shaped nanoslit, which consists of two connected oblique slits. The maximum transmission at resonance can be enhanced significantly by 71.5% in comparison with the corresponding vertical slit with the same exit width. The value and position of transmission resonance peak strongly depend on the apex angle of the V-shaped slit. The optimum apex angle, at which the transmission is maximal, is sensitive to the slit width. Such phenomena can be well explained by a concrete picture in which the incident wave drives free electrons on the slit walls. Moreover, we also simply analyze the splitting of the transmission peak in the symmetry broken V-shaped slit, originating from the resonances of different parts of the V-shaped slit. We expect that our findings will be used to design the nanoscale light sources based on the metal nanoslit structures.

Keywords: V-shaped nanoslit in metal film enhanced optical transmission surface plasmon polaritons

Received: 21 November 2012
Revised: 28 February 2013
Accepted manuscript online:

PACS:	42.25.Bs	(Wave propagation, transmission and absorption)
	78.66.Bz	(Metals and metallic alloys)
	73.20.Mf	(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11174372) and the Youth Foundation of the Education Department of Hunan Province, China (Grant Nos. 11B134 and 10B118).

Corresponding Authors: He Meng-Dong
E-mail: hemendong@sohu.com

Cite this article:

He Meng-Dong (贺梦冬), Ma Wang-Guo (马旺国), Wang Xin-Jun (王新军) Enhanced optical transmission by V-shaped nanoslit in metal film 2013 Chin. Phys. B 22 114201

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Enhanced optical transmission by V-shaped nanoslit in metal film

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