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DS: Fachverband Dünne Schichten

DS 15: Focussed Session: Frontiers in Exploring and Applying Plasmonic Systems I
(Joint Session of CPP, DS, HL, MM, and O, organized by DS)

DS 15.2: Vortrag

Montag, 20. März 2017, 16:45–17:00, CHE 89

Enhanced Infrared Spectroscopy of Single Small Fine Dust Particles with Resonant Plasmonic Nanoslits — •Jochen Vogt¹, Sören Zimmermann², Christian Huck¹, Michael Tzschoppe¹, Frank Neubrech^1,3, Sergej Fatikow², and Annemarie Pucci¹ — ¹Kirchhoff Institute for Physics, Heidelberg University, Heidelberg, Germany — ²Division Microrobotics and Control Engineering, University of Oldenburg, Oldenburg, Germany — ³4th Physics Institute, University of Stuttgart, Stuttgart, Germany

Guiding the way towards dust sensing devices based on surface-enhanced infrared (IR) absorption (SEIRA), our study demonstrates the potential of plasmonic nanostructures for chemically specific identification of single tiny fine dust particles. The model system under investigation consists of individual silica spheres with diameters below 240 nm placed at defined positions in resonant plasmonic nanoslits. With dimensions far below the wavelength, direct IR spectroscopic measurements of such particles are not possible in reasonable time scales. In our SEIRA setup, the characteristic phononic particle excitations of the silica spheres are enhanced by the strong near-field of the plasmonic nanoslits, which enables the IR spectroscopic identification of individual particles. The SEIRA signal enhancement of single particles at various positions along the nanoslit structure fully corresponds to the near-field enhancement profile of these structures with the optimal position for SEIRA sensing to be located at sites towards the slit middle.