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

Haomin Wang, Le Wang and Xiaoji G. Xu ()
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Haomin Wang: Department of Chemistry
Le Wang: Department of Chemistry
Xiaoji G. Xu: Department of Chemistry

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: 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.

Date: 2016
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DOI: 10.1038/ncomms13212

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