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Scattering-type scanning near-field microscope has been important to increase the resolution and overcome the limitation of Rayleigh criterion about the wavelength in the far field. Millimetre- (30 - 300GHz) and Terahertz- (300 - 3000GHz) waves provide unique opportunities for the development of novel applications in the active near-field imaging and spectroscopy of microscopic objects. In this paper,...