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arXiv · 0708.1886

Quantitative Determination of Enhanced and Suppressed Transmission through Subwavelength Slit Arrays in Silver Films

H. Lezec·D. Pacifici·H. Atwater·J. Weiner
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Abstract

Measurement of the transmitted intensity from a coherent monomode light source through a series of subwavelength slit arrays in Ag films, with varying array pitch and number of slits, demonstrate enhancement (suppression) by as much as a factor of 6 (9) when normalized to that of an isolated slit. Pronounced minima in the transmitted intensity were observed at array pitches corresponding to lambda_SPP, 2lambda_SPP, and 3lambda_SPP where lambda_SPP is the wavelength of the surface plasmon polariton (SPP). Increasing the number of slits to more than four does not increase appreciably the per-slit transmission intensity. These results are consistent with a model for interference between SPPs and the incident wave that fits well the measured transmitted intensity profile.

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H. Lezec, D. Pacifici, H. Atwater, J. Weiner. 2007-08-15. Quantitative Determination of Enhanced and Suppressed Transmission through Subwavelength Slit Arrays in Silver Films. https://doi.org/10.1103/physrevb.77.115411

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