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      Tight focusing of polychromatic waves using angular spectrum compensation in spatially dispersive media

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          Abstract

          A general method for tight focusing of waves, based on compensation of the angular spectrum, is established. We apply the method to monochromatic, polychromatic and diffusive waves. Diffusive and monochromatic waves may form spatially localized waves in free space, whereas polychromatic waves form light sheets or non-decaying traveling evanescent modes confined to subwavelength regions in media where the frequency depends on the wave vector. We suggest an analogy between our compensation method and the transformation of frequencies between inertial, relativistic coordinate systems.

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          Short pulses in the focal region

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            Author and article information

            Journal
            26 August 2009
            Article
            0908.3785
            fc0f2520-ec70-4561-b81d-f809a507f553

            http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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            10 pages, 1 figure
            physics.optics

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