Strong magnetism by closely spaced gold nanohoops

M. Lorente-Crespo; R. Ortuño; I. Alepuz-Benaches; C. García-Meca; Li Wang; Y. Ekinci; A. Martínez

doi:10.1117/12.921801

1 May 2012 Strong magnetism by closely spaced gold nanohoops

M. Lorente-Crespo, R. Ortuño, I. Alepuz-Benaches, C. García-Meca, Li Wang, Y. Ekinci, A. Martínez

Proceedings Volume 8423, Metamaterials VII; 84231V (2012) https://doi.org/10.1117/12.921801
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

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.

Citation Download Citation

M. Lorente-Crespo, R. Ortuño, I. Alepuz-Benaches, C. García-Meca, Li Wang, Y. Ekinci, and A. Martínez "Strong magnetism by closely spaced gold nanohoops", Proc. SPIE 8423, Metamaterials VII, 84231V (1 May 2012); https://doi.org/10.1117/12.921801

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