Optica Open
Browse

A Photonics-Based Bessel Beam Launcher with an Air-Filled Core and Cylindrical Bragg Gratings in the Cladding

Download (5.09 MB)
preprint
posted on 2024-10-09, 06:29 authored by SOLOMON MICHEAL SERUNJOGI, Ayat Taha, Mahmoud Rasras
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%.

History

Funder Name

New York University Abu Dhabi

Preprint ID

117403

Usage metrics

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC