Figure 22.

Transducers for localized photothermal spectroscopy: nanomechanical transducer based on a nanodrum resonator. Adapted with permission under a creative commons CC BY-NC-ND license from ref (218). Copyright 2018 PNAS. Panel (A) depicts the experimental setup and the principle of detection is illustrated in the subpanel at the bottom left. It depicts a line scan over a 10 nm diameter gold nanoparticle. The recorded signal and its processing are shown in panels (B) and (C). Panel (D) shows a 2D scan of 10 nm gold nanoparticles alongside the reference micrograph 2E with a higher-resolution image as the inset.