Blazing evanescent grating orders: a spectral approach to beating the Rayleigh limit.
We develop a way to enhance the amplitudes of the nonpropagating evanescent orders of resonant dielectric gratings. We use this blazing to design gratings with spectra tailored to generate steerable sub-Rayleigh field concentrations on a surface. We investigate the enhancement and customization of evanescent fields necessary to create a virtual and passive scanning probe with no moving parts. Spot size can be decreased 1 order of magnitude below the free-space Rayleigh limit.
Handmer
C J
CJ
Institute for Photonics and Optical Science (IPOS) and Centre for Ultrahigh-bandwidth Devices for Optical Systems (CUDOS), School of Physics, University of Sydney, Sydney, New South Wales 2006, Australia.
Martijn de Sterke
C
C
McPhedran
R C
RC
Botten
L C
LC
Steel
M J
MJ
Rahmani
A
A