In this study, we develop a photonics-based Bessel launcher characterized by a hollow-core
cylindrical waveguide surrounded by Bragg gratings composed of concentric silicon rings, each
375 nm thick. The meta-surface is constructed on a 5 𝜇m high silicon cylindrical substrate.
This configuration effectively generates a Bessel beam at the commonly used telecom infrared
optical wavelength of 1.55 𝜇m. We explore three variations of this optical antenna, featuring
6, 16, and 32 ring arrays, respectively. The performance of the optical antenna configuration
is assessed through simulated far-field polar plots and z-directed intensity distributions up to
a non-diffracting range (NDR) of 1 mm using CST Microwave Studio and Lumerical FDTD
Interconnect. These simulations reveal that the optical antenna gain of the launcher in the far field
varies from 20 dBi to 26 dBi as the number of concentric rings increases from 6 to 32. We report
the 𝑆11 reflection coefficient of -33 dB and radiation efficiency of 0.01 dB. To independently
verify the angular spectrum of the antenna, we employ Dyadic Green’s functions, orthogonal
vector wave functions, and Bloch’s theorem in MATLAB, demonstrating exceptional coupling of
the Gaussian beam into the photonic device with a radiation efficiency of 99%.