Optical resonance in a narrow slit in a thick metallic screen. |
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Authors: | Y Takakura |
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Affiliation: | GRTR/LSIIT/ENSPS, Université Louis Pasteur, Boulevard Sébastien Brant, F-67400 Illkirch, France. |
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Abstract: | Interaction of TM-polarized waves with a subwavelength thick metallic slit has been analyzed. A Fabry-Pérot-like behavior is reported. The resonance peaks, however, have very low magnitude and a systematic shift towards longer wavelengths is observed. The slit being narrow, this shift can be interpreted as the result of an aperture effect. Spectral transmission from a periodic array of such slits features the same peaks with a high increase in their magnitude, confirming that a grating acts as an amplifier of those resonances. Such a mechanism might explain the enhancement of the transmission observed in recent experiments [T. W. Ebbesen, H. J. Lezec, H. F. Ghaemi, T. Thio, and P. A. Wolff, Nature (London) 391, 667 (1998)]. |
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