Design and Demonstration of Impedance-matched Dual-band Chiral Metasurfaces

Scientific Reports
Minseok Kim, George V Eleftheriades

Abstract

We propose a new family of impedance-matched chiral metasurfaces that offer arbitrary polarization control at two different frequencies. To this end, two main problems are addressed: (1) determination of the required surface impedances for a certain user-defined chiral functionality at two frequencies and (2) their physical realization at microwaves. The first milestone is achieved through a proposed synthesis method that combines a semi-analytical method and a nonlinear optimization technique. In particular, the impedances are computed such that the devised chiral metasurface is also impedance-matched to a terminating medium. The chiral metasurfaces are then physically realized at microwaves by cascading layers of rotated arrays of multiple concentric rectangular copper rings. We establish that these proposed unit cells offer distinct dual-resonances that can be arbitrarily and independently tuned for two orthogonal linear polarizations at each of the two operating frequencies. This allows simultaneous physical mapping of the required surface impedances at two frequencies. The versatility and generality of the proposed numerical and physical solutions are demonstrated through two design examples: A dual-band circular polarizat...Continue Reading

References

Aug 22, 2009·Science·Justyna K GanselMartin Wegener
Nov 8, 2012·Nano Letters·Nanfang YuFederico Capasso
Mar 14, 2013·Optics Express·Anders Pors, Sergey I Bozhevolnyi
Jun 22, 2013·Optics Express·Michael Selvanayagam, George V Eleftheriades
Jul 19, 2014·Science·Dianmin LinMark L Brongersma
Jul 26, 2014·Physical Review Letters·Carl PfeifferAnthony Grbic
May 17, 2013·Physical Review Letters·Francesco MonticoneAndrea Alù

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Citations

Jan 18, 2019·Optics Express·Raphaël PestourieSteven G Johnson

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Software Mentioned

fmincon
HFSS
MATLAB
ANSYS High Frequency Electromagnetic Field Simulation ( HFSS )
Ansoft High Frequency Structure Simulator ( HFSS )

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