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Proceedings Paper

Transmission enhancement of bow-tie nano-aperture with double-layered structure
Author(s): Dongho Oh; Sookyoung Roh; Byoungho Lee
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Paper Abstract

A double-layered nano-aperture on metallic film composed of a large square aperture under a small bow-tie aperture is proposed. Numerical analysis of the proposed structure by using 3-dimensional finite difference time domain method showed that the transmission enhancement factor reached about 245 at 20 nm away from the metal surface compared to the incident intensity. Compared to the single-layered bow-tie aperture, the proposed structure had intensity about three times higher than that of single-layered one at the same resonant wavelength of 1200 nm. In addition, a near-field full width at half-maximum intensity spot size was about 56 nm in the x-direction and 64 nm in the y-direction. The enhancement factor of the proposed structure was mainly depending on the size of the additional square aperture. These properties can be adopted for nano-optical applications such as scanning near-field optical microscopy, optical data storage, nano-lithography, and bio-sensing.

Paper Details

Date Published: 10 September 2010
PDF: 6 pages
Proc. SPIE 7757, Plasmonics: Metallic Nanostructures and Their Optical Properties VIII, 77572K (10 September 2010); doi: 10.1117/12.861169
Show Author Affiliations
Dongho Oh, Seoul National Univ. (Korea, Republic of)
Sookyoung Roh, Seoul National Univ. (Korea, Republic of)
Byoungho Lee, Seoul National Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 7757:
Plasmonics: Metallic Nanostructures and Their Optical Properties VIII
Mark I. Stockman, Editor(s)

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