Plasmonic phenomena in indium tin oxide and ITO-Au hybrid films

The observation of surface-plasmon resonances in indium tin oxide (ITO) thin films is complemented with the effects of hybrid ITO/Au conducting layers where charge densities can be tuned. Where carrier densities are similar (ITO and nanoparticle Au), the plasmonic behavior is that of a monolithic IT...

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Bibliographic Details
Published in:Optics letters 2009-09, Vol.34 (18), p.2867-2869
Main Authors: FRANZEN, Stefan, RHODES, Crissy, CERRUTI, Marta, GERBER, Ralph W, LOSEGO, Mark, MARIA, Jon-Paul, ASPNES, D. E
Format: Article
Language:English
Subjects:
Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Exact sciences and technology
Physics
Surface and interface electron states
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Summary:The observation of surface-plasmon resonances in indium tin oxide (ITO) thin films is complemented with the effects of hybrid ITO/Au conducting layers where charge densities can be tuned. Where carrier densities are similar (ITO and nanoparticle Au), the plasmonic behavior is that of a monolithic ITO thin film. Where the carrier density of one layer is much greater than that of the other (ITO and Au metal), boundary conditions lead to cancelation of the surface plasmon. In the latter case a capacitivelike plasmon resonance is observed for sufficiently thin films.
ISSN:0146-9592
1539-4794
DOI:10.1364/ol.34.002867