paper

Sub-wavelength imaging at optical frequencies using canalization regime

arXiv:cond-mat/0509522 · doi:10.1103/PhysRevB.73.113110

Abstract

Imaging with sub-wavelength resolution using a lens formed by periodic metal-dielectric layered structure is demonstrated. The lens operates in canalization regime as a transmission device and it does not involve negative refraction and amplification of evanescent modes. The thickness of the lens have to be an integer number of half-wavelengths and can be made as large as required for ceratin applications, in contrast to the other sub-wavelength lenses formed by metallic slabs which have to be much smaller than the wavelength. Resolution of at 600 nm wavelength is confirmed by numerical simulation for a 300 nm thick structure formed by a periodic stack of 10 nm layers of glass with and 5 nm layers of metal-dielectric composite with . Resolution of is predicted for a structure with same thickness, period and operating frequency, but formed by 7.76 nm layers of silicon with and 7.24 nm layers of silver with .

4 pages, 4 figures, submitted to PRL

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