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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 20 — Oct. 7, 2013
  • pp: 23007–23020

Sensing with magnetic dipolar resonances in semiconductor nanospheres

Braulio García-Cámara, Raquel Gómez-Medina, Juan José Sáenz, and Borja Sepúlveda  »View Author Affiliations

Optics Express, Vol. 21, Issue 20, pp. 23007-23020 (2013)

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In this work we propose two novel sensing principles of detection that exploit the magnetic dipolar Mie resonance in high-refractive-index dielectric nanospheres. In particular, we theoretically investigate the spectral evolution of the extinction and scattering cross sections of these nanospheres as a function of the refractive index of the external medium (next). Unlike resonances in plasmonic nanospheres, the spectral position of magnetic resonances in high-refractive-index nanospheres barely shifts as next changes. Nevertheless, there is a drastic reduction in the extinction cross section of the nanospheres when next increases, especially in the magnetic dipolar spectral region, which is accompanied with remarkable variations in the radiation patterns. Thanks to these changes, we propose two new sensing parameters, which are based on the detection of: i) the intensity variations in the transmitted or backscattered radiation by the dielectric nanospheres at the magnetic dipole resonant frequency, and ii) the changes in the radiation pattern at the frequency that satisfies Kerker’s condition of near-zero forward radiation. To optimize the sensitivity, we consider several semiconductor materials and particles sizes.

© 2013 Optical Society of America

OCIS Codes
(300.6470) Spectroscopy : Spectroscopy, semiconductors
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:

Original Manuscript: April 17, 2013
Revised Manuscript: June 26, 2013
Manuscript Accepted: July 31, 2013
Published: September 23, 2013

Braulio García-Cámara, Raquel Gómez-Medina, Juan José Sáenz, and Borja Sepúlveda, "Sensing with magnetic dipolar resonances in semiconductor nanospheres," Opt. Express 21, 23007-23020 (2013)

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