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Impedance generalization for plasmonic waveguides beyond the lumped circuit model

 
: Kaiser, T.; Hasan, S.B.; Paul, T.; Pertsch, T.; Rockstuhl, C.

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Physical Review. B 88 (2013), No.3, Art. 035117, 6 pp.
ISSN: 0163-1829
ISSN: 1098-0121
ISSN: 0556-2805
English
Journal Article
Fraunhofer IOF ()

Abstract
We analytically derive a rigorous expression for the relative impedance ratio between two photonic structures based on their electromagnetic interaction. Our approach generalizes the physical meaning of the impedance to a measure for the reciprocity-based overlap of eigenmodes. The consistency with known cases in the radio-frequency and optical domain is shown. The analysis reveals where the applicability of simple circuit parameters ends and how the impedance can be interpreted beyond this point. We illustrate our approach by successfully describing a Bragg reflector that terminates an insulator-metal-insulator plasmonic waveguide in the near infrared by our impedance concept.

: http://publica.fraunhofer.de/documents/N-264602.html