Techniques for generation of annular surface plasmon polaritons with refractive binary and reflective cylindrical diffraction gratings

Vortex surface plasmon polaritons on a cylindrical waveguide: generation, propagation, and diffraction

“…In papers [8,9] we proposed three methods for generating plasmons on a simply-connected cylindrical transmission line using vortex beams created by binary phase axicons [10] and speculated on the opportunity of creating multiplex plasmonic lines. To date, a number of studies on the transmission of plasmons and spoof plasmons, mostly with the terahertz time domain technique, were carried out with smooth or corrugated cylinders and cones [11,12].…”

“…Rotating a photolithographic polarizer installed in front of a segmented half-wave plate about the optical axis, we were able to transform the Gaussian beam into a vector beam with radial or azimuthal polarization [17]. A binary spiral axicon transformed a beam with a given polarization into a Bessel beam with the orbital angular momentum E(r) = E 0 J ℓ (κr) exp(iℓφ), where φ was the azimuthal angle and |ℓ| was equal to 3 or 9 (the axicons were described in [9]). The transverse wavenumber of all beams was κ = 3.1 mm −1 .…”