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A key challenge for the development of active plasmonic nanodevices 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. The
plasmonic resonance in the dihydride state can be tuned over a wide wavelength range by simply varying the size of the
nanostructures. Furthermore, we develop an analytical diffusion model to explain the temporal behaviour of the
hydrogen loading and unloading 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 active plasmonic devices ranging
from switchable perfect absorbers to active local heating control elements.
Nikolai Strohfeldt,Andreas Tittl,Martin Schäferling,Frank Neubrech,Uwe Kreibig,Ronald Griessen, andHarald Giessen
"Yttrium hydride nanoantennas for active plasmonics", Proc. SPIE 9163, Plasmonics: Metallic Nanostructures and Their Optical Properties XII, 916305 (17 August 2014); https://doi.org/10.1117/12.2061364
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Nikolai Strohfeldt, Andreas Tittl, Martin Schäferling, Frank Neubrech, Uwe Kreibig, Ronald Griessen, Harald Giessen, "Yttrium hydride nanoantennas for active plasmonics," Proc. SPIE 9163, Plasmonics: Metallic Nanostructures and Their Optical Properties XII, 916305 (17 August 2014); https://doi.org/10.1117/12.2061364