Jpn. J. Appl. Phys. 46 (2007) pp. 7991-7994  |Previous Article| |Next Article|  |Table of Contents|
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Effect of Incident Beam Width on Light Transmission Enhancement by Bow-Tie-Shaped Nano-Aperture

Dae-Seo Park, Hyun Jun Kim1, Beom Hoan O, Se Geun Park, El-Hang Lee, and Seung Gol Lee

Optics and Photonics Elite Research Academy (OPERA), School of Information and Communication Engineering, Inha University, 253 Yonghyun-dong, Nam-gu, Incheon 402-751, Korea
1Central R&D Institute CAE Group, Samsung Electro-Mechanics Co., Ltd., Maetan 3-dong 314, Yeongtong-gu, Suwon, Gyeonggi-do 443-373, Korea

(Received November 22, 2006; revised September 3, 2007; accepted September 12, 2007; published online December 6, 2007)

In this paper, a bow-tie-shaped nano-aperture is proposed to enhance light transmission and obtain a tiny beam spot. The transmission and focusing characteristics of the proposed aperture are analyzed numerically using a dispersive three-dimensional finite-difference time-domain (3D-FDTD) method. The spot size and transmittance enhancement of the light transmitted through the optimized aperture are approximately λ/20 and 400 times, respectively. In contrast to the bowtie antenna, the proposed nano-aperture has a bow-tie-shaped opening at its center and its surroundings are filled with metal. Thus, the transmittance enhancement can be further increased by extending the interaction area between an incident beam and the metal portion of the nano-aperture, which is accomplished by increasing the beam width of an incident light.

DOI: 10.1143/JJAP.46.7991
KEYWORDS:nano-aperture, surface plasmon, light enhancement, high transmission efficiency, finite-difference time-domain (FDTD) method

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