Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures

O 37.3: Poster

Dienstag, 1. April 2014, 18:30–22:00, P2

Mechanical control of plasmonic resonances — •Anja Löhle, Audrey Berrier, and Martin Dressel — 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart

The control of light-matter interactions in real time deepens our understanding of materials, in particular in the attractive field of plasmonics. The optical properties of plasmonic structures are influenced by geometrical parameters such as shape, size or ordering of the particles, as well as by the material properties of both the environment and of the resonant particle itself. This project proposes the investigation of the active control on plasmonic structures using mechanical stretching. We report on the mechanical tuning of the optical properties of different plasmonic systems, consisting of thin metallic layers or colloidal ensembles on top of a flexible substrate. The samples are uniaxially stretched to modify the inter-particle spacing or to induce changes in the geometry of the thin films. It is shown that it is possible to go from a conductive layer to an insulating regime and back to a conductive state by stretching the substrate and subsequent release of the strain. This is monitored by reflectance measurements associated to spectroscopic ellipsometry where models are applied to extract the complex permittivity of the layers. Understanding of the behaviour of these novel, active materials is crucial to the development of novel technologies and emerging applications.