Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 4: Plasmonics and nanooptics: Fabrication and characterization
O 4.1: Vortrag
Montag, 12. März 2018, 10:30–10:45, MA 041
Refractory plasmonics without refractory materials — •Mario Hentschel1, Gelon Albrecht1,2, Stefan Kaiser1,2, and Harald Giessen1 — 14. Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany — 2Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany
Refractory plasmonics deals with metallic nanostructures that can withstand high temperatures and intense laser pulses. The common belief was that refractory materials such as TiN are necessary for this purpose. Here we show that refractory plasmonics is possible without refractory materials. We demonstrate that metallic nanostructures which are overcoated with 4 and 40 nm Al2O3 (alumina) by an atomic layer deposition process or by thick IC1-200 resist can withstand temperatures of over 800∘C and above, depending on the material, at ambient atmospheric conditions. To provide a comprehensive summary, we compare eight different plasmonic materials, namely Ag, Al, Au, Cu, Mg, Ni, Pd, and Pt. Furthermore, we demonstrate that the alumina coating also aids in nonlinear plasmonic applications where these structures can withstand intense laser radiation of over 10 GW/cm2 at ambient conditions without damage. Thus, it is possible to combine the excellent linear and nonlinear plasmonic properties of commonly used plasmonic materials with material properties that were believed to be only possible with the lossier and less nonlinear refractory materials.