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Proceedings Paper

Magnetic dipole and electric dipole resonances in TiO2 microspheres at terahertz frequencies
Author(s): Oleg Mitrofanov; Filip Domenic; Petr Kužel; John L. Reno; Igal Brener; U-Chan Chung; Cathy Elissalde; Mario Maglione; Patrick Mounaix
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Paper Abstract

In a non-magnetic dielectric sphere of high-permittivity ( <20), effective magnetic response occurs as a result of the 1st Mie mode, known as the magnetic dipole resonance. This resonance produces a similar effect as split ring resonators, making it possible to use dielectric spheres as metamaterial components. In the terahertz (THz) part of the spectrum, where dielectrics with  ~100 can be found, all-dielectric metamaterials can potentially reduce absorption and provide isotropic and polarization-independent properties. In this contribution, we discuss TiO2 micro-spheres, ~1/10 of the wavelength in diameter. Such spheres are expected to support the magnetic and electric dipole resonances. To detect these resonances in a single TiO2 microsphere we use THz near-field microscopy with the sub-wavelength size aperture probe. This method allows detection of Mie resonances in single sub-wavelength spheres. Fano-type line-shape is observed in the near-field amplitude and phase spectra. The narrow line-width of the magnetic resonance and the subwavelength size of the TiO2 microspheres make them excellent candidates for realizing low-loss THz metamaterials.

Paper Details

Date Published: 8 February 2015
PDF: 6 pages
Proc. SPIE 9370, Quantum Sensing and Nanophotonic Devices XII, 937005 (8 February 2015); doi: 10.1117/12.2079734
Show Author Affiliations
Oleg Mitrofanov, Univ. College London (United Kingdom)
Sandia National Labs. (United States)
Filip Domenic, Academy of Sciences of the Czech Republic (Czech Republic)
Petr Kužel, Academy of Sciences of the Czech Republic (Czech Republic)
John L. Reno, Sandia National Labs. (United States)
Igal Brener, Sandia National Labs. (United States)
U-Chan Chung, ICMCB, CNRS, Univ. Bordeaux (France)
Cathy Elissalde, ICMCB, CNRS, Univ. Bordeaux (France)
Mario Maglione, ICMCB, CNRS, Univ. Bordeaux (France)
Patrick Mounaix, LOMA, CNRS, Univ. Bordeaux (France)

Published in SPIE Proceedings Vol. 9370:
Quantum Sensing and Nanophotonic Devices XII
Manijeh Razeghi; Eric Tournié; Gail J. Brown, Editor(s)

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