Splitting of magnetic dipole modes in anisotropic TiO 2 micro-spheres: Splitting of magnetic dipole modes in anisotropic TiO 2 micro-spheres
- King's College London, London (United Kingdom); UCL, London (United Kingdom); ITMO University, St. Petersburg (Russia)
- Academy of Sciences of the Czech Republic (ASCR), Prague (Czech Republic). Inst. of Physics
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Univ. of Bordeaux, Pessac (France)
- UCL, London (United Kingdom); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Monocrystalline titanium dioxide (TiO2) micro-spheres support two orthogonal magnetic dipole modes at terahertz (THz) frequencies due to strong dielectric anisotropy. For the first time, we experimentally detected the splitting of the first Mie mode in spheres of radii inline imagem through near-field time-domain THz spectroscopy. By fitting the Fano lineshape model to the experimentally obtained spectra of the electric field detected by the sub-wavelength aperture probe, we found that the magnetic dipole resonances in TiO2 spheres have narrow linewidths of only tens of gigahertz. Lastly, anisotropic TiO2 micro-resonators can be used to enhance the interplay of magnetic and electric dipole resonances in the emerging THz all-dielectric metamaterial technology.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC04-94AL85000
- OSTI ID:
- 1259675
- Report Number(s):
- SAND-2016-3103J; 637692
- Journal Information:
- Laser & Photonics Reviews, Journal Name: Laser & Photonics Reviews; ISSN 1863-8880
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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