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Yttrium hydride nanoantennas for active plasmonics
Publikationstyp
Conference Paper
Date Issued
2014-08
Sprache
English
Author(s)
Strohfeldt, Nikolai
Schäferling, Martin
Neubrech, Frank
Kreibig, Uwe
Griessen, Ronald
Giessen, Harald
First published in
Number in series
9163
Article Number
916305
Citation
Plasmonics: Metallic Nanostructures and Their Optical Properties XII 2014
Contribution to Conference
Publisher DOI
Scopus ID
Publisher
SPIE
ISBN of container
978-1-62841-190-4
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.
Subjects
active plasmonics
metal-insulator transitions
metalhydrides
Particle plasmons
reconfigurable nanostructures
switchable mirrors
DDC Class
600: Technology