Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 98: Plasmonics and Nanooptics V
O 98.8: Vortrag
Freitag, 4. April 2014, 12:15–12:30, TRE Ma
CMOS-compatible switchable plasmonic perfect absorber — •Andreas Tittl1, Behrad Gholipour2, and Harald Giessen1 — 14th Physics Institute and Research Center SCOPE, University of Stuttgart, Germany — 2Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore
We demonstrate experimentally, for the first time, a CMOS-compatible switchable plasmonic perfect absorber based on the phase-change material germanium antimony telluride (GST). Our design incorporates an array of square aluminum nanopatches stacked above a GST spacer layer and an aluminum mirror. We target the atmospheric window in the 3 to 5 µm spectral range, which is of great importance for infrared detection and metrology. Furthermore, the Al/GST material system ensures full compatibility with industrial CMOS fabrication techniques. Our structures exhibit tunable absorbance >90% starting at a wavelength of 2.5 µm, which can be switched off by thermal heating of the sample above the transition temperature of 160∘C. This pronounced switching behavior enables a multitude of applications ranging from infrared imaging to localized reaction control.