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Terahertz (THz) imaging provides cutting edge technique in biology, medicalsciences and non-destructive evaluation. However, due to the long wavelength ofthe THz wave, the obtained resolution of THz imaging is normally a few hundredmicrons and is much lower than that of the traditional optical imaging. Weintroduce a sub-wavelength resolution THz imaging technique which uses the THzradiation generated by a femtosecond laser filament in air as the probe. Thismethod is based on the fact that the femtosecond laser filament forms awaveguide for the THz wave in air. The diameter of the THz beam, whichpropagates inside the filament, varies from 20 {\mu}m to 50 {\mu}m, which issignificantly smaller than the wavelength of the THz wave. Using this highlyspatially confined THz beam as the probe, THz imaging with resolution as highas 20 {\mu}m (~{\lambda}/38) can be realized.

Terahertz imaging with sub-wavelength resolution by femtosecond laser filament in air