ArticleNanophotonics (Berlin, Germany)2026
Time-Resolved SNOM via Phase-Domain Sampling.
Article in Nanophotonics (Berlin, Germany), 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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Abstract
Time-resolved scanning near-field optical microscopy (tr-SNOM) enables the measurement of the dynamic optical response of functional surfaces beyond the diffraction limit. Experimental challenges are imposed both by the use of a pulsed light source and by the need for interferometric signal modulation to isolate the near-field contribution. We present a novel experimental approach to retrieve the tr-SNOM signal using a 200-kHz laser system and pseudo-heterodyne modulation. We circumvent the Nyquist limit for spectral demodulation by sampling modulation phases, pump intensity, and SNOM signal for every laser shot. A general time-resolved SNOM signal is derived, independent of the detection scheme or physical assumptions about the near-field enhancement, and is successfully measured and isolated on WS
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