Dielectric inspired scaling of polarization conversion subwavelength resonances in open ultrathin chiral structures

Date

2015

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Source Title

Applied Physics Letters

Print ISSN

0003-6951

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Publisher

A I P Publishing LLC

Volume

107

Issue

22

Pages

1 - 6

Language

English

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Abstract

It is shown that the scaling of subwavelength resonances in open ultrathin chiral structures can be obtained by varying only the permittivity of dielectric spacers, while multiband one-way polarization conversion and related asymmetric transmission remain possible. These features are quite general and obtainable in a wide range of parameter variation. Surprisingly, the difference in the power of ε for the classical ε-1/2 scaling rule and the empirical rules obtained in the present letter does not exceed 22%, giving an important entry point for future theoretical studies and design strategies. Both spectral scaling and conservation of the polarization characteristics can be achieved by using either tunneling or real-index impedance matching. The scaled structures with strong polarization and directional selectivity may have thickness of λ/100 and smaller. © 2015 AIP Publishing LLC.

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