Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Terajets produced by 3D dielectric cuboids   The capability of generating terajets using 3D dielectric cuboids working at
terahertz (THz) frequencies (as analogues of nanojets in the infrared band) are
introduced and studied numerically. The focusing performance of the terajets
are evaluated in terms of the transversal full width at half maximum along x-
and y- directions using different refractive indexes for a 3D dielectric cuboid
with a fixed geometry, obtaining a quasi-symmetric terajet with a subwavelength
resolution of ~0.46{\lambda}0 when the refractive index is n = 1.41. Moreover,
the backscattering enhancement produced when metal particles are introduced in
the terajet region is demonstrated for a 3D dielectric cuboid and compared with
its 2D counterpart. The results of the jet generated for the 3D case are
experimentally validated at sub-THz waves, demonstrating the ability to produce
terajets using 3D cuboids.

9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn