The extraordinary optical transmission (EOT) through a subwavelength metal double-slit structure
is calculated to study in detail the correlation between the single-slit and inter-slit effects on the
transmissivity. A transmissivity formula is put down which retrieves the numerical results from the
finite-difference time-domain simulation method. After some reasonable approximations made, the
formula is expressed as the product of two periodic functions, determined by the length of a single
slit and inter-slit distance, respectively. This simplified form shows that the interplay between the
single-slit and inter-slit effects is almost negligible.
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