Article Dans Une Revue Optics Letters Année : 2021

Surface response around a sharply resonant surface polariton mode is simply a Lorentzian

Résumé

At the planar interface between a material and vacuum, the complex surface response S(omega)=[eps(omega) 1]/[eps(omega)+1], with eps(omega) the relative complex dielectric permittivity of the material, exhibit resonances, typical of the surface polariton modes, when eps(omega) ~ 1. We show that for a moderately sharp resonance, S(omega) is satisfactorily described with a mere (complex) Lorentzian, independently of the details affecting the various bulk resonances describing ) eps(omega). Remarkably, this implies a quantitative correlation between the resonant behaviors of Re[S(omega)] and Im[S(omega)], respectively associated to dispersive and dissipative effects in the surface near-field. We show that this "strong resonance" approximation easily applies, and discuss its limits, based upon published data for sapphire, CaF2 and BaF2. Extension to interfaces between two media or to a non planar interface is briefly considered.

Dates et versions

hal-03142554 , version 1 (16-02-2021)

Identifiants

Citer

J. C. de Aquino Carvalho, D. Bloch. Surface response around a sharply resonant surface polariton mode is simply a Lorentzian. Optics Letters, 2021, 46, pp.2876. ⟨10.1364/OL.422816⟩. ⟨hal-03142554⟩
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