Document Detail

Near-field probing of Mie resonances in single TiO<sub>2</sub> microspheres at terahertz frequencies.
MedLine Citation:
PMID:  25321774     Owner:  NLM     Status:  In-Data-Review    
We show experimentally that poly-crystalline TiO<sub>2</sub> 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 TiO<sub>2</sub> 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 TiO<sub>2</sub> microspheres excellent candidates for realizing low-loss THz metamaterials.
Oleg Mitrofanov; Filip Dominec; Petr Kužel; John L Reno; Igal Brener; U-Chan Chung; Cathy Elissalde; Mario Maglione; Patrick Mounaix
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Optics express     Volume:  22     ISSN:  1094-4087     ISO Abbreviation:  Opt Express     Publication Date:  2014 Sep 
Date Detail:
Created Date:  2014-10-17     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101137103     Medline TA:  Opt Express     Country:  United States    
Other Details:
Languages:  eng     Pagination:  23034-42     Citation Subset:  IM    
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