ArticleNano letters2025
Tip-Enhanced Sum Frequency Generation for Molecular Vibrational Nanospectroscopy.
Article in Nano letters, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed.
- Spiers Memorial Lecture: Vibrations at interfaces.Faraday discussions · 2026Article
- Plasmonic- and Electronic-Enhancement-Free Coherent Raman Detection of Ångström-Scale Molecular Layers at Metal Interfaces.Nano letters · 2026Article
- Giant near-field nonlinear electrophotonic effects in an angstrom-scale plasmonic junction.Nature communications · 2026Article
- Wave-mixing cathodoluminescence microscopy of low-frequency excitations.Nature communications · 2025Article
- Point-Contact Tip-Enhanced Raman Spectroscopy: Picoscale Light-Matter Interactions within Plasmonic Cavities.Nano letters · 2025Review
- In-operando control of sum-frequency generation in tip-enhanced nanocavities.Light, science & applications · 2025Article
Corrections and comments
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Authors and funding
4 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Vibrational sum frequency generation (SFG) is a nonlinear spectroscopic technique widely used to study the molecular structure and dynamics of surface systems. However, the spatial resolution achieved by far-field observations is constrained by the diffraction limit, obscuring molecular details in inhomogeneous structures smaller than the wavelength of light. To overcome this limitation, we developed a system for tip-enhanced SFG (TE-SFG) spectroscopy based on a scanning tunneling microscope. We successfully detected vibrational TE-SFG signals from adsorbed molecules on a gold substrate under ambient conditions. The phase analysis of interferometric SFG spectra provided information on molecular orientation. Furthermore, the observed TE-SFG signal was confirmed to originate from a highly localized region within a gap between the tip apex and the sample substrate. This method offers a novel platform for nonlinear optical nanospectroscopy, paving the way for the investigation of surface molecular systems beyond the diffraction limit.
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Registered trials
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