Extraordinary transmission of nanohole lattices in gold films
  We study experimentally the transmission of light through a square lattice of nanoholes perforated in a optically-thick gold film. We observe that the periodicity of the structure enhances the light transmission for specific wavelengths, and we analyze this effect theoretically by employing finite-difference time-domain numerical simulations. Furthermore, we investigate the possibilities for manipulation of the spectral transmission in quasi-periodic and chirped lattices consisting of square nanoholes with varying hole size or lattice periodicity. 
Alexander Minovich, Haroldo T. Hattori, Ian McKerracher, Hark Hoe Tan,   Dragomir N. Neshev, Chennupati Jagadish, and Yuri S...