Vol. 105

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2010-06-26

Improving Subwavelength Resolution of Multilayered Structures Containing Negative-Permittivity Layers by Flatting the Transmission Curves

By Yi Jin
Progress In Electromagnetics Research, Vol. 105, 347-364, 2010
doi:10.2528/PIER10051309

Abstract

Multilayered structures consisting of alternating negative-permittivity and dielectric layers are explored to obtain high-resolution imaging of subwavelength objects. The peaks with the smallest |ky| (ky is the transverse wave vector) on the transmission curves, which come from the guided modes of the multilayered structures, can not be completely damped by material loss. This makes the amplitudes of the evanescent waves around these peaks inappropriate after transmitted through the imaging structures, and the imaging quality is not good. To solve such a problem, the permittivity of the dielectric layers is appropriately chosen to make these sharp peaks merge with their neighboring peaks, whose corresponding guiding modes in the multilayered structure are cutoff. Wide flat upheavals are then generated on the transmission curves so that evanescent waves in a large range are transmitted through the structures with appropriate amplitudes. In addition, it is found that the sharp peaks with the smallest |ky| can be eliminated by adding appropriate coating layers and wide flat upheavals can also be obtained.

Citation


Yi Jin, "Improving Subwavelength Resolution of Multilayered Structures Containing Negative-Permittivity Layers by Flatting the Transmission Curves," Progress In Electromagnetics Research, Vol. 105, 347-364, 2010.
doi:10.2528/PIER10051309
http://jpier.org/PIER/pier.php?paper=10051309

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