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ACS Nano. 2011 Aug 23;5(8):6701-6. doi: 10.1021/nn2022414. Epub 2011 Jul 22.

Hybridized metal slit eigenmodes as an illustration of Babinet's principle.

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1
Max Planck Institute for Intelligent Systems, Heisenbergstrasse 3, 70569 Stuttgart, Germany. ogut@is.mpg.de

Abstract

By energy-filtering transmission electron microscopy (EFTEM), we observe Fabry-Pérot-like surface plasmon resonances (SPRs) along the length of rectangular single and double slits drilled into free-standing thin silver films. These eigenmodes hybridize in closely situated slits. The nature of their lateral coupling is uncovered from finite-element simulations, which show that the symmetry and energy sequence of hybrid modes is governed by Babinet complementarity principles. Interestingly, the modes of a double slit system, being proto-self-complementary, may alternatively be explained by magnetic interactions between slit fields or by electrostatic interactions across the metallic bridge separating the slits.

PMID:
21761856
DOI:
10.1021/nn2022414
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