Collective lattice resonances in arrays of dielectric nanoparticles : a matter of size

• Collective  lattice  resonances  (CLRs)  in  finite-sized  2Darrays of dielectric nanospheres have been studied via the coupled dipole approximation. We show that even for sufficiently large arrays, up to 100×100 nanoparticles (NPs),electric or magnetic dipole CLRs may differ significantly from the ones calculated for infinite arrays with the same NP  sizes  and  interparticle  distances.  The  discrepancy  is explained  by  the  existence  of  a  sufficiently  strong  cross-interaction between electric and magnetic dipoles inducedat NPs in finite-sized lattices, which is ignored for infinite arrays.  We  support  this  claim  numerically  and  propose an analytic model to estimate a spectral width of CLRs for finite-sized arrays. Given that most of the current theoretical and numerical researches on collective effects in arrays of dielectric NPs rely on modeling infinite structures, there ported findings may contribute to thoughtful and optimal design of inherently finite-sized photonic devices.

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NATURVETENSKAP  -- Fysik -- Annan fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Other Physics Topics (hsv//eng)

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Light-Scattering

Fano Resonances

Metasurfaces

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