Blazing evanescent grating orders: a spectral approach to beating the Rayleigh limit

Optical Society of America
Publication Type:
Journal Article
Optics Letters, 2010, 35 (17), pp. 2846 - 2848
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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.
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