Fig. 4: Demonstration of free-space Bessel-beam generation with a unidirectional guided-wave-driven metasurface.
From: Unidirectional guided-wave-driven metasurfaces for arbitrary wavefront control
a Schematic diagram of the USMP-driven meta-axicon which is composed of L-shaped meta-cells. The scattering wave from unidirectional waveguide is deflected to an angle θ toward its center to generate Bessel beam. b, c The simulated phase and energy of the extracted wave from each meta-cell of the designed meta-axicon. d Simulated 3D Re(Ey) distribution for our meta-device (placed at z = 0 mm) driven by unidirectional guided-wave at 2.69 GHz. e Normalized intensity profiles |Ey|2 of the generated Bessel beam in yz plane with x = 0 and (f) xy planes with z = 5λ, 8λ, and 11λ. g Normalized |Ey|2 distributions along the line with z = 8λ and x = 0, and the comparison with theoretical formula for a zero-order Bessel functions J0(αy).
