A Switchable Mid-Infrared Plasmonic Perfect Absorber with Multispectral Thermal Imaging Capability

Andreas Tittl; Ann-Katrin U Michel; Martin Schäferling; Xinghui Yin; Behrad Gholipour; Long Cui; Matthias Wuttig; Thomas Taubner; Frank Neubrech; Harald Giessen

doi:10.1002/adma.201502023

A Switchable Mid-Infrared Plasmonic Perfect Absorber with Multispectral Thermal Imaging Capability

Adv Mater. 2015 Aug 19;27(31):4597-603. doi: 10.1002/adma.201502023. Epub 2015 Jul 14.

Authors

Affiliations

¹ 4th Physics Institute and Research Center Scope, University of Stuttgart, D-70569, Stuttgart, Germany.
² I. Institute of Physics (IA), RWTH Aachen University, D-52056, Aachen, Germany.
³ Centre for Disruptive Photonic Technologies, Nanyang Technological University, 637371, Singapore, Singapore.

PMID: 26173394
DOI: 10.1002/adma.201502023

Abstract

A switchable perfect absorber with multispectral thermal imaging capability is presented. Aluminum nanoantenna arrays above a germanium antimony telluride (GST) spacer layer and aluminum mirror provide efficient wavelength-tunable absorption in the mid-infrared. Utilizing the amorphous-to-crystalline phase transition in GST, this device offers switchable absorption with strong reflectance contrast at resonance and large phase-change-induced spectral shifts.

Keywords: GST; active plasmonics; multispectral imaging; perfect absorbers; thermal imaging.