Physics – Optics
Scientific paper
2010-03-09
Journal of Optics, Vol. 12, 035705 (2010)
Physics
Optics
10 pages, 1 figure
Scientific paper
10.1088/2040-8978/12/3/035705
A general method for focusing of waves, based on phase and amplitude compensation, is applied to monochromatic, polychromatic and diffusive waves. Monochromatic waves may form spatially localized waves in free space, whereas polychromatic waves form non-decaying traveling evanescent modes conned to subwavelength regions in media where the frequency depends on the wave vector. We suggest an analogy between the phase compensation method and the transformation of frequencies between inertial, relativistic coordinate systems.
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