Local field in finite-size metamaterials: application to composites of dielectrics and metal nanoparticles

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The theory of the optical response of a metamaterial slab which is represented by metal nanoparticles embedded in a dielectric matrix is developed. It is demonstrated that the account of the reflections from the slab boundaries
essentially modifies the local field in the slab and leads to the anisotropy and spatial dispersion of its dielectric function as well as to the emergence of modes which do not exist in an infinite metamaterial. It is shown that these features introduce the existence of self-excited normal waves (polaritons) and mechanical excitons (polarization waves). These findings reveal that the metamaterial slab can be regarded as an active device (“plasmonic
oscillator”) which generates sustained polaritons in the presence of dissipation. A relation of this effect with the phenomenon of a plasmonic blackbody or perfect absorber, observed in such structures, is discussed and a
possible mechanism of this phenomenon is proposed.
OriginalsprogEngelsk
Artikelnummer115410
TidsskriftPhysical Review B
Vol/bind97
Udgave nummer11
ISSN2469-9969
DOI
StatusUdgivet - 9. mar. 2018

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