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Scattering-type scanning near-field optical microscopy with low-repetition-rate pulsed light source through phase-domain sampling

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  • Haomin Wang

    (Department of Chemistry)

  • Le Wang

    (Department of Chemistry)

  • Xiaoji G. Xu

    (Department of Chemistry)

Abstract

Scattering-type scanning near-field optical microscopy (s-SNOM) allows spectroscopic imaging with spatial resolution below the diffraction limit. With suitable light sources, s-SNOM is instrumental in numerous discoveries at the nanoscale. So far, the light sources have been limited to continuous wave or high-repetition-rate pulsed lasers. Low-repetition-rate pulsed sources cannot be used, due to the limitation of the lock-in detection mechanism that is required for current s-SNOM techniques. Here, we report a near-field signal extraction method that enables low-repetition-rate pulsed light sources. The method correlates scattering signals from pulses with the mechanical phases of the oscillating s-SNOM probe to obtain near-field signal, by-passing the apparent restriction imposed by the Nyquist–Shannon sampling theorem on the repetition rate. The method shall enable s-SNOM with low-repetition-rate pulses with high-peak-powers, such as femtosecond laser amplifiers, to facilitate investigations of strong light–matter interactions and nonlinear processes at the nanoscale.

Suggested Citation

  • Haomin Wang & Le Wang & Xiaoji G. Xu, 2016. "Scattering-type scanning near-field optical microscopy with low-repetition-rate pulsed light source through phase-domain sampling," Nature Communications, Nature, vol. 7(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13212
    DOI: 10.1038/ncomms13212
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