ArticleNature communications2026
Direction-resolved nanoscale optical imaging with near-nanometer resolution by emerging infrared torsional force microscopy.
Article in Nature communications, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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5 authors.
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Abstract
Resolving nanoscale light-matter interactions requires both high spatial resolution and anisotropic sensitivity to in-plane and out-of-plane optical responses. We introduce torsional force microscopy-infrared microscopy, a new optical imaging technique that combines cantilever torsional dynamics with a nonlinear frequency-mixing scheme to map both in-plane and out-of-plane photothermal signals. Using birefringent mica as a model system, we resolve distinct in-plane and out-of-plane vibrational responses and reconstruct the anisotropic strain distribution of nanobubbles, in excellent agreement with simulation. Furthermore, we demonstrate near-nanometer ( ~ 1 nm) spatial resolution in optical imaging of twisted bilayer graphene, enabling site-resolved spectroscopy within individual moiré cells. Energy-dependent imaging further reveals intra-unit cell optical features, highlighting the role of competing physical processes in a moiré lattice modulating its optical properties. By providing a direct, anisotropy-resolved view of nanoscale optical heterogeneities, this emerging infrared torsional force microscopy establishes a powerful platform for probing, understanding, and ultimately engineering light-matter interactions in complex quantum materials.
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