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SYES: Symposium Spain as Guest of Honor

SYES 2: Spain as Guest of Honor II

SYES 2.5: Hauptvortrag

Donnerstag, 19. März 2020, 17:15–17:45, HSZ 01

Infrared signatures of the coupling between vibrational and plasmonic excitations — •Annemarie Pucci — Kirchhoff-Institut für Physik (KIP), Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 227, 691210 Heidelberg, Germany

Related to confinement, free charge carriers in nanostructures show strong plasmonic resonances in the infrared. Depending on the charge carriers' plasma frequency and on electronic damping, the coherent oscillations are accompanied by a more or less enhanced resonant electro-magnetic nearfield. So, at the plasmonic resonance of a tailored nanostructure, an extraordinarily high nearfield enhancement and thus strong surface enhanced infrared absorption (SEIRA) of a vibrational dipole with the same resonance frequency and sitting inside the nearfield can be obtained, see our work together with J. Aizpurua (Donostia-San Sebastian), for example [1-3]. Combining the ideas of the nearfield enhancement in narrow gaps and tailored resonant plasmonic structures leads the application of nano-apertures for vibrational sensing, for example of ultrafine silica particles. The SEIRA signal of a single particle with diameter below 50 nm could be seen as a Fano-type anti-absorption on the background of resonant plasmonic extinction measured with a commercial infrared-spectroscopic microscope.[4] [1] F. Neubrech et al., Appl. Phys. Lett. 89 (2006) 253104. [2] F. Neubrech et al., Phys. Rev. Lett. 101 (2008)157403. [3] T. Neuman, er al., J. Phys. Chem. C 119 (2015) 26652. [4] C. Huck, et al., Phys. Rev. Applied 11(2019) 014036.