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BULK PLASMON RESONANCES IN ELECTROREFLECTANCE SPECTRA OF THIN SILVER LAYERS

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HAL Id: jpa-00223539

https://hal.archives-ouvertes.fr/jpa-00223539

Submitted on 1 Jan 1983

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BULK PLASMON RESONANCES IN

ELECTROREFLECTANCE SPECTRA OF THIN SILVER LAYERS

F. Forstmann, K. Kempa, G. Piazza, D. Kolb

To cite this version:

F. Forstmann, K. Kempa, G. Piazza, D. Kolb. BULK PLASMON RESONANCES IN ELECTRORE- FLECTANCE SPECTRA OF THIN SILVER LAYERS. Journal de Physique Colloques, 1983, 44 (C10), pp.C10-395-C10-395. �10.1051/jphyscol:19831081�. �jpa-00223539�

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JOURNAL DE PHYSIQUE

Colloque CIO, supplement au n°12, Tome 44, decembre 1983 page C10-395

BULK PLASMON RESONANCES IN ELECTROREFLECTANCE SPECTRA OF THIN SILVER LAYERS

u If-

F. Forstmann, KJ Kempa, G. Piazza and D.M. Kolb

Freie VniversitSt Berlin, Faahbereiah Physik WES, Arnimallee 14, V-1000 Berlin 22, F.R.G.

*Fritz-Haber-Inst, der MFC, Berlin, F.R.G.

Résumé - Les spectres d'électrorêflectance (ER) de couches minces d'argent sur or ont été mesurés au voisinage de la fréquence de plasma de l'argent (ftop = 3,8 eV).

Pour des épaisseurs croissantes de la couche d'argent ëlectrodéposée, Te signal ER montre des oscillations en lumière polarisée p. Ces oscillations peuvent être re- liées à des ondes de plasma stationnaires, et fournissent une méthode très préci- se pour l'étude de la dispersion du plasmon de volume à grandes longueurs d'onde, faibles k. L'analyse basée sur une séparation de la réponse en une partie électrons libres et une partie due aux électrons l i é s , met en évidence des déviations par rapport aux résultats RPA-gaz d'électrons.

Abstract - Electroreflectance spectra of thin silver layers on gold have been measured around the plasma frequency of Ag(f)<up = 3.8 e V ) . With growing thickness of the electrodeposited silver layer, the ER-signal shows oscillations for p-pola- rized light. These oscillations can be related to standing plasma waves and esta- blish a very accurate method for the investigation of the bulk plasraon dispersion at long wavelengths, small k. The evaluation on the basis of a separation of the response into a free electron part and a part due to bound electrons shows devia- tions from the RPA-electron gas results.

Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:19831081

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