Beamline Phone Number:
+44 (0) 1235 778684
Principal Beamline Scientist:
Dr Gianfelice Cinque
Tel: +44 (0) 1235 778410
E-mail: [email protected]
Email: [email protected]
Tel: +44 (0)1235 56 7675
In s-SNOM, an AFM tip is used to confine and focus the IR light interaction on a sample via its scattered reflection. When the tip is brought very close to the sample surface, the IR light probes the sample in the near-field region.
The scattered light can be detected and contains information about the sample's local optical properties. In particular, the signal amplitude is related to the sample reflectivity, whereas the phase response approximately corresponds to the IR absorption spectrum.
In the experimental approach of the nano-FTIR setup, an asymmetric interferometer is used. The AFM tip and sample are located in one of the interferometer arms. The scattered light is recombined with a reference beam at the detector. The interferogram corresponds to the detector signal as a function of reference mirror position: Fourier Transform is then applied to obtain phase and amplitude.
For life sciences, this technique is suitable for thin biological preparations onto reflective substrates and studies in the fingerprint region
Diamond Light Source is the UK's national synchrotron science facility, located at the Harwell Science and Innovation Campus in Oxfordshire.
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