Abstract— 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, we report a novel focusing
probe made by 3D printer in the scanning near-field millimetre
wave microscope. We analyse the structure and the dielectric
properties of this material. The parameters of the tapered tip
are simulated in Cassandra which is a three-dimensional fullwave
electromagnetic solver developed at the department of
information technology (INTEC) at UGent. The experiments are
carried out to verify that the 3D printed focusing probes improve
the transmission amplitude imaging, the phase images are worse
than Teflon probe’s phase images because of the inner structure
of 3D printed probe which is not homogenous.