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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 16.10: Vortrag

Montag, 16. März 2020, 12:45–13:00, WIL A317

The influence of size and shape of tip and substrate in gap-mode tip-enhanced Raman spectroscopy — •lu he, mahfujur rahaman, teresa i. madeira, and d.r.t. zahn — Semiconductor physics, University of technology Chemnitz, Germany

Tip-enhanced Raman Spectroscopy (TERS) utilizes the confined electric field in the vicinity of a metal tip. The typical spatial resolution is around 2 nm[1] and even sub-nanometer can be achieved[2,3]. Many factors play a role in the TERS technique[4]. Our simulation focuses on the comparison of the two configurations. The first one consists of various tip radii with thin film while the second one consists of a constant tip radius with various radii of spherical substrates in a metal-metallic gap-mode TERS system using the finite element method (FEM). An unusual shift in the first case is observed. An improved expression of the above approximation is obtained for the second case.