Spatial Confinement of Light onto a Flat Metallic Surface Using Hybridization between Two Cavities

Adam Weissman, Matan Galanty, David Gachet, Elad Segal, Omer Shavit, Adi Salomon

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Controlling the optical field down to the nanometer scale is a key step in optoelectronic applications and light–matter interaction at the nanoscale. Bowtie structures, rods, and sharp tapers are commonly used to realize such optical properties, but their fabrication is challenging. In this context, the complementary structures, namely, holes and cavities, are less explored. Herein, a simple system of two metallic nanocavities milled in thin silver film is used to confine the electromagnetic field to an area of ≈60 nm2. The field is confined onto a flat surface area and is either enhanced or suppressed by the polarization state of incident light. The energy of this spatially confined mode is determined by the distance between the two cavities and thus any color (wavelength) at the optical regime can be achieved. As a consequence, a dynamically controlled color is generated on an optical pixel size smaller than 1 µm2. Those results are supported by both transmission spectra and a cathodoluminescence study.

Original languageEnglish
Article number1700097
JournalAdvanced Optical Materials
Volume5
Issue number10
DOIs
StatePublished - 17 May 2017

Bibliographical note

Publisher Copyright:
© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • cathodoluminescense
  • color generators
  • hybridization
  • light confinement
  • nanocavities
  • plasmonics

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