期刊
LASER & PHOTONICS REVIEWS
卷 10, 期 5, 页码 799-806出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.201600055
关键词
dielectic nanoparticles; magnetic dipole resonance; dark-field spectroscopy; electromagnetic field localization
资金
- Russian Science Foundation [15-12-20028]
- Australian Research Council
- DSI
- A*STAR SERC Pharos program (Singapore) [152 73 00025]
- Russian Science Foundation [15-12-20028] Funding Source: Russian Science Foundation
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.
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