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

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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Wang H,Wang L,Xu XG

doi

10.1038/ncomms13212

subject

Has Abstract

pub_date

2016-10-17 00:00:00

pages

13212

issn

2041-1723

pii

ncomms13212

journal_volume

7

pub_type

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