ArticleACS photonics2025
Theoretical Description of Infrared Near-Field Spectroscopy of In- and Out-of-Plane Molecular Vibrations in Thin Layers.
Article in ACS photonics, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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5 citing papers in PubMed.
- Quantitative Infrared-to-Terahertz Nanospectroscopy of Semiconductors.ACS photonics · 2026Article
- Article
- Probing Local Structural Variations in Metal-Organic Framework Thin Films Using Nano-FTIR.Langmuir : the ACS journal of surfaces and colloids · 2026Article
- PAS-Domain Protein Orientation at a Polyelectrolyte Surface Revealed by Infrared Nanospectroscopy, Chiral Vibrational Spectroscopy, and Molecular Dynamics Simulations.Biomacromolecules · 2026Article
- Infrared Nano-Spectroscopy of Single Cell Sections at the Ultrastructural Level.Nanophotonics (Berlin, Germany) · 2026Article
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6 authors.
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Abstract
Infrared nanospectroscopy, based on scattering-type scanning near-field optical microscopy (s-SNOM), allows for chemical nanoidentification of organic composite layers by local probing of their molecular vibrations. However, the conditions for probing in-plane and out-of-plane molecular vibrations by this technique remain largely unexplored. Here, we perform a systematic theoretical study of the local infrared near-field response of isotropic and anisotropic thin layers using electrostatic numerical calculations, complemented by analytical electrodynamic point-dipole model calculations. Specifically, we study uniaxial thin layers exhibiting molecular vibrations with different orientations on highly and weakly reflecting substrates. We find that both in-plane and out-of-plane molecular vibrations can be probed, with the sensitivity to in-plane vibrations being reduced in samples where the near fields are vertically oriented, such as in thin layers on highly reflecting substrates. We finally show that fast calculations of near-field spectra of uniaxial thin layers can be done with a perturbative finite-dipole model, achieving reasonable quantitative accuracy compared to electrostatic numerical results.
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