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Article Dans Une Revue Applied Physics Letters Année : 2013

Giant optical field enhancement in multi-dielectric stacks by photon scanning tunneling microscopy

C. Ndiaye
  • Fonction : Auteur
M. Zerrad
A. L. Lereu
  • Fonction : Auteur
F. Lemarchand
  • Fonction : Auteur
C. Amra

Résumé

Dielectric optical thin films, as opposed to metallic, have been very sparsely explored as good candidates for absorption-based optical field enhancement. In such materials, the low imaginary part of the refractive index implies that absorption processes are usually not predominant. This leads to dielectric-based optical resonances mainly via waveguiding modes. We show here that when properly designed, a multi-layered dielectric thin films stack can give rise to optical resonances linked to total absorption. We report here, on such dielectric stack designed to possess a theoretical optical field enhancement above 1000. Using photon scanning tunneling microscopy, we experimentally evaluate the resulting field enhancement of the stack as well as the associated penetration depth. We thus demonstrate the capability of multi-dielectric stacks in generating giant optical field with tunable penetration depth (down to few dozens of nm).
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Dates et versions

hal-00945849 , version 1 (13-02-2014)

Identifiants

Citer

C. Ndiaye, M. Zerrad, A. L. Lereu, R. Roche, Philippe Dumas, et al.. Giant optical field enhancement in multi-dielectric stacks by photon scanning tunneling microscopy. Applied Physics Letters, 2013, 103 (13), pp.131102 - 131102-4. ⟨10.1063/1.4822093⟩. ⟨hal-00945849⟩
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