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O: Fachverband Oberflächenphysik

O 46: Plasmonics and Nanooptics IV: Fabrication and Applications

O 46.10: Vortrag

Mittwoch, 20. März 2024, 12:45–13:00, MA 042

Very thin plasmonic films for optical mirrors: influence of the dielectric function on the spectral properties — •Manuel Gonçalves — Ulm University - Inst. of Experimental Physics, Albert-Einstein-Allee 11, 89081 Ulm, Germany

Metallic thin films combined with dielectric layers allow a large variety of optical effects, as broadband high reflectivity, narrow spectral dips due to surface plasmon resonances and almost total absorption by surface nanostructuring.

In this contribution, it is shown that very thin films of few nanometers thickness can produce broadband resonances with high contrast in the vis-NIR reflectance spectrum, when interacting with an underlying high reflectance mirror. However, the design of such colored mirrors cannot employ the classical dielectric function of the bulk material. Several effective medium theory (EMT) models have been proposed for quasi-percolated thin films. A study of these models and their application in the design of the reflectance spectra is presented.

Keywords: plasmonic thin film; optical resonance; effective medium theory; plasmonic nanoparticle