Abstract
We investigate the mechanism of extraordinary optical transmission in subwavelengthmetal hole arrays. Experimental results for the arrays consisting of square or rectangularholes are well explained by the dependence of transmission strength on the polarizationdirection of the incident light. This polarization dependence occurs in each single hole. Fora hole array, there is in addition an interplay between the adjacent holes which iscaused by the transverse magnetic field of surface plasmon polaritons on themetal film surfaces. Based on the detailed study of a single-hole and two-holestructures, a simple method to calculate the total transmissivity of hole arrays isproposed.
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