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9 September 2011Sub-wavelength imaging using stacks of metallic meander structures
with different periodicities
Two resonant surfaces, which allow the propagation of surface plasmon polaritons (SPPs) can mimic negative index
materials (NIM). Hence, it is possible to recreate the near-field imaging effects known from Pendry's perfect lens. The
metallic meander structure is a well-suited candidate for such a resonant surface due to the excitation and tunability of
the short (SRSPP) and long range surface plasmon (LRSPP) frequencies. Furthermore, the Fano-type pass band between
the SRSPP and LRSPP frequencies of a single meander sheet retains its dominant role when being stacked. We demonstrate how a stack consisting of two meander structures can perfectly image within this pass band region and propose a stack of meander structures with successively increasing periodicity. Such a stack might be capable to decrease the lateral wave vector until near-field to far-field transformation is achieved. The frequency shift of the pass band for
each sheet can be compensated by changing other geometrical parameters. We rigorously calculate the spectra of various
meander designs and show that meander stacks transfer energy resonantly over large distances with a high transmission.
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Philipp Schau, Karsten Frenner, Liwei Fu, Wolfgang Osten, Heinz Schweizer, Harald Giessen, "Sub-wavelength imaging using stacks of metallic meander structures with different periodicities," Proc. SPIE 8093, Metamaterials: Fundamentals and Applications IV, 80931K (9 September 2011);