Plasmonic origami: tuning optical properties by periodic folding of a gold nano film
Shaojun Wang, Laurent Arnaud, Soukaina Es-Saidi, S. Blaize, S. Kostcheev, Aurélien Bruyant, Abdelhamid Hmima, Yassine Hadjar, Demetrio Macı́as, Pierre‐Michel Adam, Ekoue A. Dogbe Foli, Rana Nicolas, Rémi Vincent
Abstract
Novel plasmonic structures are on the rise, with applications varying from sensing and spectroscopy to solar cells and biological therapies. In this work, we introduce a plasmonic metasurface with a very rich dispersion spectrum, measured both experimentally and numerically. It shows a tunable absorption that depends on the folding angle and periodicity. A detailed numerical analysis identifies the presence of quasi-omnidirectional absorption. This broad directional absorption mode matches a Fabry–Perot resonance of a surface plasmon polariton along an elementary segment of the periodic structure. This geometry induced wide directional absorption is highly promising for a variety of photonic, light harvesting, and sensing applications.