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Q: Fachverband Quantenoptik und Photonik

Q 70: Nanophotonics I

Q 70.6: Vortrag

Freitag, 14. März 2025, 12:15–12:30, HS I PI

Plasmonic colors made easy: how ultra-thin metal films make bright colors — •Manuel Gonçalves — Ulm University - Inst. of Experimental Physics

Several different methods of plasmonic color generation have been demonstrated: nanostructured metal surfaces, metasurfaces based on particles and gratings, arrays of nanoparticles on a mirror, laser modification of deposited thin films. These methods are usually based on percolated films, with optical properties similar to those of bulk. However, when films of gold and silver of only few nanometers of average thickness are deposited on top of a mirror, vivid colors arise. The colors are only dependent on thickness of the spacer. Moreover, it was found that quantum-mechanical effects arise in the photoluminescence of crystalline gold UTMFs and they are advantageous in hot carrier generation and in nonlinear optics. A comparison between the optical properties of crystalline and polycrystalline UTMFs is provided.

Keywords: Ultra-thin metallic films; plasmonic color generation; nanoparticle on a mirror; crystalline gold sheet; photoluminescence