Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 72: Poster: Scanning Probe Microscopy: Light Matter Interaction at Atomic Scales

O 72.10: Poster

Wednesday, March 20, 2024, 18:00–20:00, Poster D

Plasmonic probe preparation for tip-enhanced Raman spectroscopy and photoluminescence on single molecules — •Petr Kahan, Amandeep Sagwal, Rodrigo Ferreira, and Martin Švec — Institute of Physics, Czech Academy of Sciences; Cukrovarnická 10/112, CZ16200 Praha 6, Czech Republic

Various approaches to preparation of plasmonic tips for tip-enhanced Raman scattering (TERS) and photoluminescence (PL) are known [1,2] and were applied to spectroscopy on single molecules. Such preparation procedures are rather complex and time-consuming, hence not adequate for routine applications where more tips need to be prepared and tested efficiently at low input costs. Here we explore a new methodology of the TERS/PL tips fabrication, based on etching [3] silver and gold wires, and subsequent ion sputtering [4], aiming to obtain high purity surface of the resulting tips, which is required for good plasmonic activity and avoiding any spurious Raman scattering from the tip contamination. We optimize the procedure based on screening of the tip quality using the scanning electron microscopy, being able to improve reproducibility and prospects of a successful application of such tips in demanding experiments measuring single-molecule luminescence and Raman spectroscopy with scanning probe techniques.

[1] Li, M. et al. Journal of Raman Spectroscopy 47, 808-812 (2016). [2] Yang, B. et al. JPCC 122, 16950-16955 (2018). [3] Walker, P. & Tarn, W. H. CRC handbook of metal etchants. (CRC press, 1990). [4] Hoffrogge, P., Kopf, H. & Reichelt, R. J Appl Phys 90, 5322-5327 (2001).

Keywords: Plasmonic; probe preparation; tip-enhanced Raman scattering; photoluminescence; etching