Magnetic dipole and electric dipole resonances in TiO2 microspheres at terahertz frequencies

Oleg Mitrofanov; Filip Domenic; Petr Kužel; John L. Reno; Igal Brener; U-Chan Chung; Cathy Elissalde; Mario Maglione; Patrick Mounaix

doi:10.1117/12.2079734

8 February 2015 Magnetic dipole and electric dipole resonances in TiO₂ microspheres at terahertz frequencies

Oleg Mitrofanov, Filip Domenic, Petr Kužel, John L. Reno, Igal Brener, U-Chan Chung, Cathy Elissalde, Mario Maglione, Patrick Mounaix

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Proceedings Volume 9370, Quantum Sensing and Nanophotonic Devices XII; 937005 (2015) https://doi.org/10.1117/12.2079734
Event: SPIE OPTO, 2015, San Francisco, California, United States

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.

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Oleg Mitrofanov, Filip Domenic, Petr Kužel, John L. Reno, Igal Brener, U-Chan Chung, Cathy Elissalde, Mario Maglione, and Patrick Mounaix "Magnetic dipole and electric dipole resonances in TiO₂ microspheres at terahertz frequencies", Proc. SPIE 9370, Quantum Sensing and Nanophotonic Devices XII, 937005 (8 February 2015); https://doi.org/10.1117/12.2079734

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KEYWORDS

Terahertz radiation

Optical spheres

Titanium dioxide

Magnetism

Near field

Resonators

Metamaterials

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