5_04b/2009Tip-enhanced Raman scattering: Small 4/2009

Transparent gold crystals can act as ideal substrates for tip-enhanced Raman spectroscopy. The cover picture shows the schematic setup using such gold crystals. Their typical thickness is less than 20 nm while the diameter is on the order of a few micrometers. The sample can be easily immobilized on the gold surface, which has a roughness well beyond 1 nm. The excitation light penetrates the gold plate and localized plasmons induced by the metal tip that acts as the main field-enhancing site are generated, leading to a strong and localized Raman signal. The first experiments using cystine as a sample prove the viability of the concept and indicate at least two surface conformers of cystine on gold. For more information, please read the Communication “Ultraflat Transparent Gold Nanoplates: Ideal Substrates for Tip-Enhanced Raman Scattering Experiments” by T. Deckert-Gaudig and V. Deckert, beginning on page 432.

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