Abstract
We present an experimental study on a unidirectional surface plasmon
polariton (SPP) launcher based on a compact binary area-coded nanohole array, where
the symmetry breaking is realized via effective-index modulation in the binary
pattern of the gold film, thus avoiding the challenge of modulating nanostructure in
its depth. It is shown that SPPs can be unidirectionally and effectively excited at
normal incidence. The SPP intensity and asymmetric excitation ratio, which are two
key figure-of-merits of SPP launchers, can be improved by increasing the number of
array rows. The proposed device is compatible with most mature top-town
nanofabrication techniques and thus is perspective for low-cost mass production.
© 2014 Chinese Optics Letters
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