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Figure 5
(a) Schematic of the synchrotron nano-FTIR experimental setup showing the broadband synchrotron IR beam that feeds an asymmetric Michelson interferometer where one of the arms is the tip-sample AFM stage. (Inset) Schematic showing how far-field broadband radiation is strongly confined at the tip apex enabling a nanometric IR probe (∼25 nm spatial resolution). (b) Synchrotron nano-FTIR interferograms (inset) and Fourier-processed amplitude spectra acquired from a clean gold surface. Gray, yellow and green spectra were acquired with a full broadband beam (950–10000 cm−1), after UDR4 bandpass filter (1000–4000 cm−1) and after UDR8 bandpass filter (1000–2000 cm−1).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 31| Part 3| May 2024| Pages 547-556
https://doi.org/10.1107/S1600577524002364
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