Near-field probing of Mie resonances in single TiO2 microspheres at terahertz frequencies
MITROFANOV, Oleg
Department of Electronic and Electrical Engineering [DEEE]
Center for Integrated Nanotechnologies [CIN]
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Department of Electronic and Electrical Engineering [DEEE]
Center for Integrated Nanotechnologies [CIN]
MITROFANOV, Oleg
Department of Electronic and Electrical Engineering [DEEE]
Center for Integrated Nanotechnologies [CIN]
Department of Electronic and Electrical Engineering [DEEE]
Center for Integrated Nanotechnologies [CIN]
RENO, John L.
Center for Integrated Nanotechnologies [CIN]
Sandia National Laboratories [Albuquerque] [SNL]
Center for Integrated Nanotechnologies [CIN]
Sandia National Laboratories [Albuquerque] [SNL]
BRENER, Igal
Center for Integrated Nanotechnologies [CIN]
Sandia National Laboratories [Albuquerque] [SNL]
< Reduce
Center for Integrated Nanotechnologies [CIN]
Sandia National Laboratories [Albuquerque] [SNL]
Language
en
Article de revue
This item was published in
Optics Express. 2014-09-22, vol. 22, n° 19, p. 23034-23042
Optical Society of America - OSA Publishing
English Abstract
We show experimentally that poly-crystalline TiO2 spheres, 20-30 μm in diameter, exhibit a magnetic dipole Mie resonance in the terahertz (THz) frequency band (1.0-1.6 THz) with a narrow line-width (<40 GHz). We detect and ...Read more >
We show experimentally that poly-crystalline TiO2 spheres, 20-30 μm in diameter, exhibit a magnetic dipole Mie resonance in the terahertz (THz) frequency band (1.0-1.6 THz) with a narrow line-width (<40 GHz). We detect and investigate the magnetic dipole and electric dipole resonances in single high-permittivity TiO2 microspheres, using a near-field probe with a sub-wavelength (~λ/50) size aperture and THz time-domain spectroscopy technique. The Mie resonance signatures are observed in the electric field amplitude and phase spectra, as well as in the electric field distribution near the microspheres. The narrow line-width and the sub-wavelength size (λ/10) make the TiO2 microspheres excellent candidates for realizing low-loss THz metamaterials.Read less <
English Keywords
Resonators
Spectroscopy
Terahertz
Terahertz imaging.
Terahertz imaging
Metamaterials
Near-field microscopy
Origin
Hal imported