Enhanced optical transmission by V-shaped nanoslit in metal film

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 v...

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Bibliographic Details
Published in:Chinese physics B 2013-11, Vol.22 (11), p.287-292, Article 114201
Main Author: 贺梦冬 马旺国 王新军
Format: Article
Language:English
Subjects:
Apex angle
Incident waves
Nanostructure
Optimization
Perforated metals
Slits
V形切口
V形槽
Walls
光传输
共振峰
狭缝宽度
纳米级
裂缝
金属膜
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Summary: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.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/22/11/114201