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Article Dans Une Revue Applied Physics Letters Année : 2012

Size-dependent infrared properties of MgO nanoparticles with evidence of screening effect

Résumé

We have investigated the infrared (IR) absorption properties of MgO nanoparticles (NPs) with the means of molecular dynamics simulations. Several size effects have been observed. We show in particular that the absorption of IR radiation does not occur predominantly through the polariton mode but preferentially through surface modes. This enhanced surface absorption is found to result from the absence of dielectric screening of the first atomic layer of the NPs. We demonstrate concomitantly that a macroscopic description of electrodynamics is inadequate to capture these unusual IR properties.
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Dates et versions

hal-00708577 , version 1 (15-06-2012)

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Y. Chalopin, H. Dammak, M. Hayoun, Mondher Besbes, Jean-Jacques Greffet. Size-dependent infrared properties of MgO nanoparticles with evidence of screening effect. Applied Physics Letters, 2012, 100, pp.241904. ⟨10.1063/1.4729384⟩. ⟨hal-00708577⟩
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