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O: Fachverband Oberflächenphysik
O 9: Plasmonics and Nanooptics I: Local Probes and Raman (joint session O/CPP)
O 9.2: Vortrag
Montag, 16. März 2020, 10:45–11:00, WIL A317
Anti-Stokes Light Scattering in an Electrically Biased Plasmonic Nanojunction — •Shuyi Liu1, Martin Wolf1, and Takashi Kumagai1,2 — 1Department of Physical Chemistry, Fritz-Haber Institute of the Max-Planck Society, Faradayweg 4-6, 14195 Berlin, Germany. — 2JST-PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan.
Photon scattering and emission from plasmonic nanostructures have attracted increasing attention but the underlying mechanisms have been debated. [1,2] We report on light scattering from an electrically-biased plasmonic nanocavity, which composed of a Ag tip and Ag(111) surface, using a low-temperature scanning tunneling microscope (STM). It is found that anti-Stokes shifted scattered light is observed occurs when a bias voltage (< 2V) is applied to the junction. By observing the scattering spectra in dependence on the spectral shape of the localized surface plasmon resonance (LSPR) in the STM junction, we revealed that either electronic Raman scattering (ERS) or photoluminescence (PL) dominates the process depending on spectral matching of the LSPR with excitation wavelength. We discuss the possibility that ERS occurs by the interaction of the LSPR with a "gap exciton" in the STM junction. Reference: [1] Mertens et al, Nano Lett. 17, 2568-2574 (2017).[2] Cai et al, Anti-Stokes Emission from Hot Carriers in Gold Nanorods. Nano Lett. 19, 1067-1073 (2019).