Jpn. J. Appl. Phys. 43 (2004) pp. 407-417  |Previous Article| |Next Article|  |Table of Contents|
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Finitte-Difference Time-Domain Studies on Optical Transmission through Planar Nano-Apertures in a Metal Film

Eric X. Jin and Xianfan Xu

School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA

(Received April 18, 2003; revised July 22, 2003; accepted October 8, 2003; published January 13, 2004)

The finite-difference time-domain (FDTD) method is employed to numerically study the transmission characteristics of an H-shaped nano-aperture in a metal film in the optical frequency range. It is demonstrated that the fundamental TE10 mode concentrated in the gap between the two ridges of the H-shaped aperture provides a high transmission efficiency above unity and the size of the gap determines the sub-wavelength resolution. Fabry–Perot-like resonance is observed. Localized surface plasmon (LSP) is excited on the edges of the aperture in a silver film but has a negative effect on the signal contrast and field concentration, while aluminum acts similar to an ideal conductor if the film thickness is several times larger than the finite skin depth. In addition, it is shown that two other ridged apertures, C-shaped and bowtie-shaped apertures, can also be used to achieve a sub-wavelength resolution in the near field with a transmission efficiency above unity and a high contrast.

DOI: 10.1143/JJAP.43.407
KEYWORDS:nano-aperture, ridged aperture, scanning near field optical microscopy (SNOM), finite-difference time-domain (FDTD) method, high transmission efficiency

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