Optical transmission through single subwavelength apertures using prism coupled input of laser light of annular intensity profile.
Light transmission through a single subwavelength aperture in a silver film is examined with a novel input configuration comprising an annular laser beam of variable diameter that is prism-coupled to the back face of the silver. Transmission peaks driven by excitation of the back-face surface plasmon mode or by the aperture resonance itself are separately observed. For both cases, comparison of films with and without a front-face, circular, grating implies significantly more efficient coupling from the aperture fields to the front-face surface plasmon than directly to free radiation.
Feng
L
L
Centre for Nanostructured Media, School of Maths and Physics, Queen's University of Belfast, BT7 1NN ,UK. lei.feng@qub.ac.uk
Dawson
P
P
D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D008027:Light; D012031:Refractometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012542:Scattering, Radiation; D012680:Sensitivity and Specificity; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*
D012834:Silver