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Active chiral plasmonics
Publikationstyp
Journal Article
Date Issued
2015-06-03
Sprache
English
Author(s)
Yin, Xinghui
Schäferling, Martin
Michel, Ann Katrin U.
Wuttig, Matthias
Taubner, Thomas
Giessen, Harald
Journal
Volume
15
Issue
7
Start Page
4255
End Page
4260
Citation
Nano Letters 15 (7): 4255-4260 (2015)
Publisher DOI
Scopus ID
Publisher
ACS Publ.
Active control over the handedness of a chiral metamaterial has the potential to serve as key element for highly integrated polarization engineering approaches, polarization sensitive imaging devices, and stereo display technologies. However, this is hard to achieve as it seemingly involves the reconfiguration of the metamolecule from a left-handed into a right-handed enantiomer and vice versa. This type of mechanical actuation is intricate and usually neither monolithically realizable nor viable for high-speed applications. Here, enabled by the phase change material Ge<inf>3</inf>Sb<inf>2</inf>Te<inf>6</inf> (GST-326), we demonstrate a tunable and switchable mid-infrared plasmonic chiral metamaterial in a proof-of-concept experiment. A large tunability range of the circular dichroism response from = 4.15 to 4.90 m is achieved, and we experimentally demonstrate that the combination of a passive bias-type chiral layer with the active chiral metamaterial allows for switchable chirality, that is, the reversal of the circular dichroism sign, in a fully planar, layered design without the need for geometrical reconfiguration. Because phase change materials can be electrically and optically switched, our designs may open up a path for highly integrated mid-IR polarization engineering devices that can be modulated on ultrafast time scales.
Subjects
chirality
metamaterial
phase change material
plasmonic
Switchable
tunable
DDC Class
600: Technology