Fig. 5: Picocavity THZ SERS.
From: Uncovering low-frequency vibrations in surface-enhanced Raman of organic molecules
showing two examples (in a–c, d–f) using BPT (see inset, molecule 4). a, d Time series of consecutive SERS spectra (1 s integration time) with picocavity induced at time \(\tau\), giving new single molecule SERS peaks. b, e Extracted nanocavity SERS spectrum. c, f Picocavity SERS (extracted by subtracting from each spectra in (a, d) the average nanocavity spectrum, taken from times 0–10 s). Inset in (c): Atomic protrusion from the top NP facet forms picocavity with enhanced field (darker green) compared to the nanocavity. The bosonic and exponential background contributions are subtracted in all spectra.
