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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 10 — May. 10, 2010
  • pp: 10905–10923

On the experimental investigation of the electric and magnetic response of a single nano-structure

P. Banzer, U. Peschel, S. Quabis, and G. Leuchs  »View Author Affiliations

Optics Express, Vol. 18, Issue 10, pp. 10905-10923 (2010)

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We demonstrate an experimental method to separately test the optical response of a single sub-wavelength nano-structure to tailored electric and magnetic field distributions in the optical domain. For this purpose a highly focused y-polarized TEM10-mode is used which exhibits spatially separated longitudinal magnetic and transverse electric field patterns. By displacing a single sub-wavelength nano-structure, namely a single split-ring resonator (SRR), in the focal plane, different coupling scenarios can be achieved. It is shown experimentally that the single split-ring resonator tested here responds dominantly as an electric dipole. A much smaller but yet statistically significant magnetic dipole contribution is also measured by investigating the interaction of a single SRR with a magnetic field component perpendicular to the SRR plane (which is equivalent to the curl of the electric field) as well as by analyzing the intensity and polarization distribution of the scattered light with high spatial resolution. The developed experimental setup as well as the measurement techniques presented in this paper are a versatile tool to investigate the optical properties of single sub-wavelength nano-structures.

© 2010 Optical Society of America

OCIS Codes
(260.5430) Physical optics : Polarization
(290.5820) Scattering : Scattering measurements
(160.3918) Materials : Metamaterials
(350.4238) Other areas of optics : Nanophotonics and photonic crystals

Original Manuscript: February 1, 2010
Manuscript Accepted: March 17, 2010
Published: May 10, 2010

Virtual Issues
Unconventional Polarization States of Light (2010) Optics Express

Peter Banzer, Ulf Peschel, Susanne Quabis, and Gerd Leuchs, "On the experimental investigation of the electric and magnetic response of a single nano-structure," Opt. Express 18, 10905-10923 (2010)

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  30. We are still investigating the explanation for the observed diagonal asymmetry. We already have evidence, that the asymmetry is a interference between the light reflected by the substrate and the electric as well as the magnetic dipole emission. Provided the SRR is not positioned exactly on the optical axis or is a result of the non-perfect shape of the SRR.

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