Abstract
We show that a scanning light beam can be focused below the diffraction limit without the control of moving near-field elements using the combination of two main components: a light-controlled saturable absorber, which creates seed evanescent components from the beam, and a layer of negative-refraction material, which amplifies the evanescent waves. Focusing to spots with a FWHM in the range of is predicted. For slightly off-resonant input beams, an intensity-dependent phase shift leads to smaller spots.
- Received 9 August 2005
DOI:https://doi.org/10.1103/PhysRevLett.96.013902
©2006 American Physical Society