The transmission property of metallic films with two-dimensional hole arrays is studied experimentally and numerically. For a triangular lattice subwavelength hole array in a 150 nm thick Ag film, both cavity resonance and planar surface modes are identified as the sources of enhanced optical transmissions. Semi-analytical models are developed for calculating the dispersion relation of the cavity resonant mode. They agree well with the experimental results and full-wave numerical calculations. Strong interaction between the cavity resonant mode and surface modes is also observed.
Kuang, Wan; English, Alex; Knowlton, William B.; Lee, Jeunghoon; Hughes, William L.; and Yurke, Bernard. (2010). "Cavity Resonant Mode in a Metal Film Perforated with Two-Dimensional Triangular Lattice Hole Arrays". Optics Communications, 283(20), 4090-4093. http://dx.doi.org/10.1016/j.optcom.2010.05.055