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The capability of generating terajets using 3D dielectric cuboids working atterahertz (THz) frequencies (as analogues of nanojets in the infrared band) areintroduced and studied numerically. The focusing performance of the terajetsare evaluated in terms of the transversal full width at half maximum along x-and y- directions using different refractive indexes for a 3D dielectric cuboidwith a fixed geometry, obtaining a quasi-symmetric terajet with a subwavelengthresolution of ~0.46{\lambda}0 when the refractive index is n = 1.41. Moreover,the backscattering enhancement produced when metal particles are introduced inthe terajet region is demonstrated for a 3D dielectric cuboid and compared withits 2D counterpart. The results of the jet generated for the 3D case areexperimentally validated at sub-THz waves, demonstrating the ability to produceterajets using 3D cuboids.

Terajets produced by 3D dielectric cuboids