Evanescent TE-Polarized Bessel-Beam Launcher Using a Coplanar Loop Array

Bessel beams in the propagation regime have long been investigated for their unique properties of limited diffraction and self healing. Conversely, Bessel beams in the evanescent regime have not met the same interest in spite of their attractive features of a subwavelength, highly focused main beam and highly decaying radiation amplitude. These additional features, unachievable with propagating Bessel beams, make technologies based on evanescent Bessel beams potentially well suited for several applications. For this reason, in this work, an original device generating evanescent Bessel beams is proposed and demonstrated by full-wave simulations.