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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: Plasmonics and Nanooptics I: Local Probes and Raman (joint session O/CPP)

CPP 16.9: Vortrag

Montag, 16. März 2020, 12:30–12:45, WIL A317

Tip-Enhanced Raman Scattering of CdSe-CdS Nanoplatelets on Plasmonic Substrates — •Ilya Milekhin¹, Mahfujur Rahaman¹, Tatyana Duda^2,3, Ekaterina Rodyakina^2,3, Kirill Anikin^2,3, Roman Vasiliev⁴, Volodymyr Dzhagan⁵, Alexander Milekhin^2,3, Alexander Latyshev^2,3, and Dietrich RT Zahn¹ — ¹Semiconductor Physics, Chemnitz University of Technology, Chemnitz, Germany — ²A.V. Rzhanov Institute of Semiconductor Physics RAS, Novosibirsk, Russia — ³Novosibirsk State University, Novosibirsk, Russia — ⁴Department of Material Science, Moscow State University, Moscow, Russia — ⁵V.E. Lashkaryov Institute of Semiconductor Physics, Kiev, Ukraine

We present the results on a gap-plasmon tip-enhanced Raman scattering (TERS) study of core-shell CdSe-CdS nanoplatelets (NPs) deposited on periodic arrays of Au nanodisks which serve as plasmonic substrates. The fabrication of Au nanodisks with a diameter of 110 nm and a height of 50 nm on Si substrates covered with a 77 nm of SiO2 was performed by electron beam lithography. NPs with a characteristic size of 100x30x3 nm were deposited onto the plasmonic substrate using the Langmuir-Blodgett technique. We observe a remarkable Raman enhancement of the phonon modes of CdSe and CdS from NPs located in the plasmonic gap between Au nanodisks and TERS tip. Gap-mode TERS imaging was performed at 638 and 785 nm excitation and allowed us to visualize the near field distribution of the gap-plasmon with relative TERS contrast of 30. A phonon response of the single NP was achieved with a spatial resolution of 2 nm.