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Appl. Sci. 2018, 8(1), 60; doi:10.3390/app8010060

Broadband Electromagnetic Dipole Resonance by the Coupling Effect of Multiple Dielectric Nanocylinders

College of Metrology & Measurement Engineering, China Jiliang University, Hangzhou 310018, China
Institute of Optoelectronic Technology, China Jiliang University, Hangzhou 310018, China
Author to whom correspondence should be addressed.
Received: 30 November 2017 / Revised: 26 December 2017 / Accepted: 27 December 2017 / Published: 3 January 2018
(This article belongs to the Special Issue Sub-wavelength Optics)
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Broadband resonant scattering in a visible region that can be obtained by coupled multiple silicon nanocylinders. For a single high refractive index silicon nanocylinder, the electric dipole and magnetic dipole resonances can be observed. By constructing a silicon nanocylinder dimer, the interaction between the particles plays an important role in broadband scattering. Interestingly, due to magnetic-magnetic dipole interaction, a splitting phenomenon of magnetic resonance mode is revealed. A new magnetic resonant mode emerges at a longer wavelength in dimer and trimer by changing the diameter of one nanocylinder in dimer or trimer, and the gap size between nanocylinders. The scattering bandwidth can further increase with the effect of substrate, which is attributed to the extension of resonant mode into substrate. The broadband optical response can be revealed by the calculated scattering resonant spectra and the spatial electromagnetic field distributions. Furthermore, the transmission of periodic nanocylinder structure, including single nanocylinder and dimer, is demonstrated. By decreasing the gap between nanocylinders in dimer for periodic array structure, a new electric resonant mode occurs. These results can provide a guideline to realize broadband resonant optical elements. View Full-Text
Keywords: scattering; nanoparticles; dielectric; broadband scattering; nanoparticles; dielectric; broadband

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Fang, B.; Jing, X.; Ye, Q.; Cai, J.; Zhou, P. Broadband Electromagnetic Dipole Resonance by the Coupling Effect of Multiple Dielectric Nanocylinders. Appl. Sci. 2018, 8, 60.

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