Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 66: Plasmonics and nanooptics: Applications and other aspects II

O 66.1: Vortrag

Mittwoch, 14. März 2018, 15:00–15:15, MA 041

Compact, Cheap, and Fully Optical Nanoplasmonic Gas Detection Scheme Demonstrated by Means of Hydrogen and CO₂ — •Tobias Pohl, Ediz Herkert, Florian Sterl, Nikolai Strohfeldt, and Harald Giessen — 4th Physics Institute and Research Center SCOPE, University of Stuttgart, D-70569 Stuttgart, Germany

Current gas detection systems are often bulky, expensive, and complex. Furthermore, many of these systems use electrical readout that poses a danger as possible ignition source. We introduce a novel general nano-optical gas detection scheme based on a plasmonic perfect absorber. The absorber, consisting of a mirror, a spacer layer and plasmonic disks, absorbs almost all light at a designed wavelength and can incorporate gas-sensitive materials to form a highly efficient detector. The fabrication method of colloidal etching lithography allows for cheap, large area, and mass production. We demonstrate the device capability through detection of hydrogen using palladium nanodisks and carbon dioxide by employing titanium dioxide as gas sensitive spacer layer. Incorporated into a custom-made compact sensing device with a simple combination of LED and photodiode, we studied the time-, concentration-, and temperature-dependent behavior of the fabricated sensor chips. In the future the generality of our platform will also enable us to expand its use to many different other gases by simply exchanging one material.