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Proceedings Paper

Strong magnetism by closely spaced gold nanohoops
Author(s): M. Lorente-Crespo; R. Ortuño; I. Alepuz-Benaches; C. García-Meca; Li Wang; Y. Ekinci; A. Martínez
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Paper Abstract

In this work, we show that closely-spaced gold nanohoops periodically distributed in a square lattice can provide a strong magnetic response in the near infrared regime when illuminated under normal incidence (perpendicular to the structure plane). Therefore, just a single metallic layer is needed to achieve the magnetic activity. A key point to achieve this response is that the aspect ratio must be higher than 1. Transmission and reflection spectra taken by means of a Fourier-Transform Infrared spectrometer show a strong absorbance peak at a wavelength that can be tuned by modifying the hole radius of the nanohoops or the underlying dielectric substrate. Numerical simulations show that at the resonance wavelength a virtual current loop is created, giving rise to a strong magnetic moment and a large magnetic field enhancement in the space between nanohoops.

Paper Details

Date Published: 1 May 2012
PDF: 6 pages
Proc. SPIE 8423, Metamaterials VII, 84231V (1 May 2012); doi: 10.1117/12.921801
Show Author Affiliations
M. Lorente-Crespo, Univ. Politécnica de Valencia (Spain)
R. Ortuño, Univ. Politécnica de Valencia (Spain)
I. Alepuz-Benaches, Univ. Politécnica de Valencia (Spain)
C. García-Meca, Univ. Politécnica de Valencia (Spain)
Li Wang, Paul Scherrer Institut (Switzerland)
Y. Ekinci, Paul Scherrer Institut (Switzerland)
ETH Zurich (Switzerland)
A. Martínez, Univ. Politécnica de Valencia (Spain)

Published in SPIE Proceedings Vol. 8423:
Metamaterials VII
Allan D. Boardman; Nigel P. Johnson; Richard W. Ziolkowski, Editor(s)

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