Near-field spectroscopic properties of complementary gold nanostructures: applicability of Babinet's principle in the optical region

Kohei Imura, Hiromi Okamoto, Hiroaki Misawa, Kosei Ueno, Hidetoshi Mizobata

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

We examine the far-field and near-field properties of complementary screens made of nanostructured gold thin films, a rectangular nanowire and a nanovoid, using an aperture-type scanning near-field optical microscope and electromagnetic field calculations, and discuss the applicability of Babinet's principle in the optical region. The far-field transmission spectra of the complementary screens are considerably different from each other. On the other hand, genuine near-field extinction spectra exhibit nearly complementary characteristics. The spatial features of the observed near-field images for the complementary screens show little correlation. We have found from the Fourier analysis of the simulated images that high spatial-frequency components of the electromagnetic fields show mutual spatial correlation. These results suggest that Babinet's principle is applicable to the high spatial-frequency components of electromagnetic fields for the complementary screens. (C) 2017 Optical Society of America
Original languageEnglish
Pages (from-to)5279-5289
Number of pages11
JournalOptics Express
Volume25
Issue number5
DOIs
StatePublished - 6 Mar 2017

Keywords

  • DISCRETE-DIPOLE APPROXIMATION; NANOPARTICLES; SCATTERING; REFRACTION; GRAINS; INDEX

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