Substrate and aspect-ratio effects in resonant nanoaperture arrays
A Roberts, L Lin
OPTICAL MATERIALS EXPRESS | OPTICAL SOC AMER | Published : 2011
Here we discuss the influence of a substrate on transmission through subwavelength holes in metallic films. In particular, we show that in the case of transmission maxima associated with localized resonances of the apertures, that the wavelength at which this maximum occurs are strongly influenced by the presence of a substrate and the aspect ratio of the structure. Furthermore, we show that removing a shallow region of the substrate immediately below the apertures leads to blue-shifting of the resonance and increased transmission compared to that in the presence of a homogeneous substrate. © 2011 The Optical Society of America.
Awarded by Australian Research Council
This research was supported under the Australian Research Council's Discovery Projects funding scheme (project number DP0878268). The authors would like to acknowledge useful conversations with Dr Tim Davis.