Far field subwavelength imaging and focusing using a wire medium based resonant metalens

Details Far field subwavelength imaging and focusing using a wire medium based resonant metalens Far field subwavelength imaging and focusing using a wire medium based resonant metalens

2010-06-04

arxiv.org/abs/1006.0830v2

Physics

Optics

Scientific paper

This is the second article in a series of two dealing with the concept of "resonant metalens" we introduced recently [Phys. Rev. Lett. 104, 203901 (2010)]. It is a new type of lens capable of coding in time and radiating efficiently in the far field region sub-diffraction information of an object. A proof of concept of such a lens is performed in the microwave range, using a medium made out of a square lattice of parallel conducting wires with finite length. We investigate a sub-wavelength focusing scheme with time reversal and demonstrate experimentally spots with focal widths of {\lambda}/25. Through a cross-correlation based imaging procedure we show an image reconstruction with a resolution of {\lambda}/80. Eventually we discuss the limitations of such a lens which reside essentially in losses.

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