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O: Fachverband Oberflächenphysik

O 13: Plasmonics and nanooptics: Light-matter interaction, spectroscopy I

O 13.1: Vortrag

Montag, 12. März 2018, 15:00–15:15, MA 041

Ultrafine-Dust Detection Based on Surface Enhanced Infrared Absorption Using Bowtie Nanoantennas — •Christian Huck¹, Michael Tzschoppe¹, Rostyslav Semenyshyn², Frank Neubrech¹, and Annemarie Pucci¹ — ¹Kirchhoff-Institute for Physics, Heidelberg Universtity, Germany — ²4th Physics Institute and Research Center SCoPE, University of Stuttgart, Germany

In the last years, surface-enhanced infrared absorption (SEIRA) has been established as a powerful method for chemical structure analysis of thin molecular layers. Much less attention has so far been payed to other potential fields of application, such as the detection and characterization of small particles, e.g. ultrafine-dust particles. Here, we report on an experimental study, which shows, that deeply sub-wavelength sized particles can be detected and chemically analyzed by SEIRA. Our study is based on bowtie shaped apertures etched in a thin Au layer, used to enhance phononic excitations¹ of individual silica particles. As it turned out, the bowtie geometry features several advantages for the detection of ultrafine-dust particles, which we want to detail during the talk. Backed up by numerical calculations, we show that a detection limit in terms of a particle diameter of as low as 20 nm can be achieved, corresponding to a ratio to the wavelength of λ²/d²>250000. Our approach offers the possibility to analyze infrared vibrations from tiniest particles and thus paves the way toward SEIRA-based fine dust sensing devices.

Huck et al. Opt. Express 24, 25528-25539 (2016)