Enhanced transmission of periodic, quasiperiodic, and random nanoaperture arrays

We numerically and experimentally show that the enhanced transmission of an array of annular nanoapertures is independent of the nanoaperture's arrangement. This holds if this enhancement primarily relies on Fabry-Perot resonances of guided modes in the nanoapertures. We observe a comparable transmission spectrum for a periodic, a quasiperiodic, and even a random nanoaperture arrangement. This complements previous findings where the enhanced transmission of a circular nanoaperture array was shown to rely on the excitation of surface-plasmon polaritons at the metal surface and thus strongly depended on the nanoaperture's arrangement.