Journal
APPLIED PHYSICS LETTERS
Volume 89, Issue 17, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2364693
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A light spot that is smaller than a half wavelength will subsequently diverge in all directions. In this letter, the authors model a subwavelength (0.42 lambda) super-resolution light beam which propagates over a long distance without any divergence. This can be achieved by placing a multibelt pure-phase-type binary optical element on the lens pupil. The authors also report a useful approach for designing the optical element, based on vector diffraction theory, which can be used in paraxial and nonparaxial focusing and imaging systems. (c) 2006 American Institute of Physics.
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