Hybridized Metal Slit Eigenmodes as an Illustration of Babinet’s Principle

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• 作者：Burcu Ögüt ; Ralf Vogelgesang ; Wilfried Sigle ; Nahid Talebi ; Christoph T. Koch ; Peter A. van Aken
• 刊名：ACS Nano
• 出版年：2011
• 出版时间：August 23, 2011
• 年：2011
• 卷：5
• 期：8
• 页码：6701-6706
• 全文大小：953K
• 年卷期：0
• ISSN：1936-086X

文摘

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.