Enhanced transmission through nano-aperture on a tapered metallic substrate

C. M. Wang; B. Ung; Y. Sheng; J. Y. Chang

doi:10.1016/j.optcom.2006.04.002

Enhanced transmission through nano-aperture on a tapered metallic substrate

C. M. Wang, B. Ung, Y. Sheng, J. Y. Chang

Department of Optics and Photonics

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

The optical transmission and distribution through a subwavelength slit on a tapered metallic substrate was investigated. By using a 45° tapered structure rather than a traditional metallic plate, a 6-fold transmission enhancement could be achieved. This is due to the asymmetrical excitation of surface waves and the matching of propagation constants between the surface waves and slit waveguide. In addition, by patterning surface corrugations in the exit plane, the beam could be focused. By tuning the period of the surface corrugations, we were able to adjust the focal length. For an input wavelength of 0.5 μm, the focal point could be kept within 0.6 μm with a focal length extending from 0.5 μm to 2.5 μm and a grating period ranging from 0.5 μm to 0.6 μm.

Original language	English
Pages (from-to)	678-682
Number of pages	5
Journal	Optics Communications
Volume	265
Issue number	2
DOIs	https://doi.org/10.1016/j.optcom.2006.04.002
State	Published - 15 Sep 2006

Keywords

Apertures
Diffraction theory
Surface waves

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10.1016/j.optcom.2006.04.002

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title = "Enhanced transmission through nano-aperture on a tapered metallic substrate",

abstract = "The optical transmission and distribution through a subwavelength slit on a tapered metallic substrate was investigated. By using a 45° tapered structure rather than a traditional metallic plate, a 6-fold transmission enhancement could be achieved. This is due to the asymmetrical excitation of surface waves and the matching of propagation constants between the surface waves and slit waveguide. In addition, by patterning surface corrugations in the exit plane, the beam could be focused. By tuning the period of the surface corrugations, we were able to adjust the focal length. For an input wavelength of 0.5 μm, the focal point could be kept within 0.6 μm with a focal length extending from 0.5 μm to 2.5 μm and a grating period ranging from 0.5 μm to 0.6 μm.",

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AU - Wang, C. M.

AU - Ung, B.

AU - Sheng, Y.

AU - Chang, J. Y.

PY - 2006/9/15

Y1 - 2006/9/15

N2 - The optical transmission and distribution through a subwavelength slit on a tapered metallic substrate was investigated. By using a 45° tapered structure rather than a traditional metallic plate, a 6-fold transmission enhancement could be achieved. This is due to the asymmetrical excitation of surface waves and the matching of propagation constants between the surface waves and slit waveguide. In addition, by patterning surface corrugations in the exit plane, the beam could be focused. By tuning the period of the surface corrugations, we were able to adjust the focal length. For an input wavelength of 0.5 μm, the focal point could be kept within 0.6 μm with a focal length extending from 0.5 μm to 2.5 μm and a grating period ranging from 0.5 μm to 0.6 μm.

AB - The optical transmission and distribution through a subwavelength slit on a tapered metallic substrate was investigated. By using a 45° tapered structure rather than a traditional metallic plate, a 6-fold transmission enhancement could be achieved. This is due to the asymmetrical excitation of surface waves and the matching of propagation constants between the surface waves and slit waveguide. In addition, by patterning surface corrugations in the exit plane, the beam could be focused. By tuning the period of the surface corrugations, we were able to adjust the focal length. For an input wavelength of 0.5 μm, the focal point could be kept within 0.6 μm with a focal length extending from 0.5 μm to 2.5 μm and a grating period ranging from 0.5 μm to 0.6 μm.

KW - Apertures

KW - Diffraction theory

KW - Surface waves

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U2 - 10.1016/j.optcom.2006.04.002

DO - 10.1016/j.optcom.2006.04.002

M3 - 期刊論文

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SN - 0030-4018

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SP - 678

EP - 682

JO - Optics Communications

JF - Optics Communications

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ER -

Enhanced transmission through nano-aperture on a tapered metallic substrate

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Keywords

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