| Abstract
| - Nanocoatings of TiO2 (60−105 nm in thickness) were applied to one side of freestanding Ni films withmicroarrays of subwavelength holes exhibiting the extraordinary transmission effect in the infrared. Shifts,attenuation, and broadening of the transmission resonances at perpendicular incidence have been observedversus coating thickness. The Ni microarrays exhibit potential as sensors for nanoscale coating thickness anddielectric properties, all of which are accomplished simply by placing mesh in the sample region of an FTIRspectrometer in transmission mode, at perpendicular incidence, without any angle tuning. A second orderrelation between resonance shifts and coating thickness has been developed which accounts for the effect ofchanging wavelength of this configuration. A framework is developed for converting these results to momentumspace allowing comparison with surface plasmon attenuated total reflection experiments. This exerciseilluminates the need for better theoretical models of radiation damping on mesh.
|
