Figure 1: Infrared vibrational s-SNOM imaging. | Nature Communications

Figure 1: Infrared vibrational s-SNOM imaging.

From: Vibrational nano-spectroscopic imaging correlating structure with intermolecular coupling and dynamics

Figure 1

(a) Diagram of interferometric s-SNOM experiment for spatiospectral nano-imaging, with atomic force microscope (AFM), tunable quantum cascade laser (QCL), MCT IR detector, beamsplitter (BS) and lock-in amplifier. Tip oscillation at ωc~250 kHz, and reference arm mirror oscillation at Ω ~500 Hz. (b–e) Sample scans of quasi-lamellar PS-b-PMMA showing AFM tapping phase (b, arb. units), AFM height (c) and near-field phase (φs-SNOM) on (d) and off resonance (e) with the carbonyl mode (4-pixel Gaussian filter). Scale bars 200 nm.

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