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Light transmission by subwavelength square coaxial aperture arrays in metallic films

A. Moreau, G. Granet, F. I. Baida, and D. Van Labeke

Open Access Open Access

Abstract

Using the Fourier modal method, we study the enhanced transmission exhibited by arrays of square coaxial apertures in a metallic film. The calculated transmission spectrum is in good agreement with FDTD calculations. We show that the enhanced transmission can be explained when we consider a few guided modes of a coaxial waveguide.

©2003 Optical Society of America

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Figures (9)
Fig. 1.
Fig. 1. Coaxial square aperture in a metallic film.

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Fig. 2.
Fig. 2. Transmission of a square coaxial aperture calculated with the FDTD (blue curve) and the Fourier modal method (red curve).

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Fig. 3.
Fig. 3. Dispersion curves of the first mode. Blue curve, real part; red curve, imaginary part. The presence of dips is probably due to the right angle corners.

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Fig. 4.
Fig. 4. Dispersion curves of the second mode. Blue curve, real part; red curve, imaginary part.

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Fig. 5.
Fig. 5. Modulus of the transverse electric field of the first guided mode.

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Fig. 6.
Fig. 6. Modulus of the transverse electric field of the second guided mode.

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Fig. 7.
Fig. 7. Twenty-first modal amplitude coefficients inside the coaxial on the upper face. The red bar corresponds to an attenuated guided wave.

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Fig. 8.
Fig. 8. Twenty-first modal amplitude coefficients inside the coaxial on the lower face. The red bar corresponds to an attenuated guided wave.

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Fig. 9.
Fig. 9. The ten first complex propagating constants associated to the ten first modes that are exited on the upper face inside the coaxial waveguide. The red one corresponds to an attenuated guide wave; its value is γ=1.39—0.006i.

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