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The importance of Fabry-Perot resonance and the role of shielding in subwavelength imaging performance of multiwire endoscopes

Rahman, A. R. ; Belov, P. A. ; Silveirinha, M. G. ; Simovsky, C.R. ; Hao, Y. ; Parini, C.

Applied Physics Letters Vol. 94, Nº 031104, pp. 1 - 3, January, 2009.

ISSN (print): 0003-6951
ISSN (online): 0003-6951

Journal Impact Factor: 3,726 (in 2008)

Digital Object Identifier: 10.1063/1.3073714

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Abstract
Multiwire endoscopes may enable the manipulation of the electromagnetic field in the subwavelength scale. Recently, two different configurations of such devices have been proposed. Here, we compare the imaging performance of the imaging device introduced by Belov et al. (Phys. Rev. B 73, 033108, 2006) and by Silveirinha et al. (Phys. Rev. B 75, 035108, 2007) with the
shielded multiwire endoscope described by Shvets et al. (Phys. Rev. Lett. 99, 053903, 2007). It is
demonstrated that the performance of the latter may be strongly affected by the presence of a metallic shield around the endoscope and by poor matching between the endoscope and free space. Our results show that the metallic shield is completely unnecessary and emphasize the importance of tuning the length of the wires according to the Fabry–Pérot resonance condition, as proposed by Belov et al. (Phys. Rev. B 73, 033108, 2006).