Polarization control over electric and magnetic dipole resonances of dielectric nanoparticles on metallic films

We reveal unusually strong polarization sensitivity of electric and magnetic dipole resonances of high‐index dielectric nanoparticles placed on a metallic film. By employing dark‐field spectroscopy, we observe the polarization‐controlled transformation from high‐Q magnetic‐dipole scattering to broad...

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Bibliographic Details
Published in:Laser & photonics reviews 2016-09, Vol.10 (5), p.799-806
Main Authors: Sinev, Ivan, Iorsh, Ivan, Bogdanov, Andrey, Permyakov, Dmitry, Komissarenko, Filipp, Mukhin, Ivan, Samusev, Anton, Valuckas, Vytautas, Kuznetsov, Arseniy I., Luk'yanchuk, Boris S., Miroshnichenko, Andrey E., Kivshar, Yuri S.
Format: Article
Language:English
Subjects:
Broadband
dark-field spectroscopy
dielectic nanoparticles
Dielectric strength
Electric dipoles
electromagnetic field localization
Green's functions
magnetic dipole resonance
Magnetic dipoles
Magnetic resonance
Mathematical analysis
Nanoparticles
Nanospheres
Nonlinear phenomena
Polarization
Resonance scattering
Scattering
Spectrum analysis
Transformations
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Summary:We reveal unusually strong polarization sensitivity of electric and magnetic dipole resonances of high‐index dielectric nanoparticles placed on a metallic film. By employing dark‐field spectroscopy, we observe the polarization‐controlled transformation from high‐Q magnetic‐dipole scattering to broadband suppression of scattering associated with the electric dipole mode, and show numerically that it is accompanied by a strong enhancement of the respective fields by the nanoparticle. Our experimental data for silicon nanospheres are in an excellent agreement with both analytical calculations based on Green's function approach and the full‐wave numerical simulations. Our findings further substantiate dielectric nanoparticles as strong candidates for many applications in enhanced sensing, spectroscopy and nonlinear processes at the nanoscale. The dark‐field spectroscopy studies of silicon nanosphere on gold film reveal polarization‐controlled transformation from high‐Q magnetic‐dipole scattering to broadband suppression of scattering associated with the electric dipole mode of the particle. Numerical calculations demonstrate that these substrate‐induced effects are accompanied by strong enhancement of the respective fields by the nanoparticle, which suggests new ideas for sensing applications and enhancement of nonlinear processes.
ISSN:1863-8880
1863-8899
DOI:10.1002/lpor.201600055