Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 46: Plasmonics and Nanooptics I
O 46.2: Vortrag
Mittwoch, 2. April 2014, 10:45–11:00, TRE Phy
Yttrium hydride nanoantennas for reconfigurable plasmonics — •Nikolai Strohfeldt1, Andreas Tittl1, Martin Schäferling1, Frank Neubrech1, Uwe Kreibig2, Ronald Griessen3, and Harald Giessen1 — 1Universität Stuttgart, Germany — 2RTWH Aachen, Germany — 3Vrije Universiteit Amsterdam, The Netherlands
A key challenge for the development of active plasmonic devices is the lack of materials with fully controllable plasmonic properties. In this work we demonstrate that a plasmonic resonance in top-down nanofabricated yttrium antennas can be completely and reversibly turned on and off using hydrogen exposure. We fabricate arrays of yttrium nanorods and optically observe in extinction spectra the hydrogen-induced phase transition between the metallic yttrium dihydride and the insulating trihydride. Whereas the yttrium dihydride nanostructures exhibit a pronounced particle plasmon resonance, the transition to yttrium trihydride leads to a complete vanishing of the resonant behavior. Our fully reversible plasmonic switch can be tuned over a wide wavelength range by simply varying the size of the nanostructures. Furthermore, we developed an analytical diffusion model with which we are able to explain the temporal behavior of the reconfiguration process observed in our experiments and gain information about the thermodynamics of our device. Thus, our nanorod system serves as a versatile basic building block for reconfigurable plasmonic devices ranging from reconfigurable perfect absorbers to active local heating control elements.