2021/06/04 by Henna Farheen, Farheen, Henna, Till Leuteritz +7
Engineering · Physics and Astronomy · #Advanced Fiber Laser Technologies #Advanced Photonic Communication Systems #FOS: Physical sciences #Optics (physics.optics) #Photonic and Optical Devices
paper · pdf · doi:10.48550/arxiv.2106.02468
openalex publication_date 2021/06/04 · openalex created_date 2022/10/01 · openalex updated_date 2026/07/28
Optical travelling wave antennas offer unique opportunities to control and\nselectively guide light into a specific direction which renders them as\nexcellent candidates for optical communication and sensing. These applications\nrequire state of the art engineering to reach optimized functionalities such as\nhigh directivity and radiation efficiency, low side lobe level, broadband and\ntunable capabilities, and compact design. In this work we report on the\nnumerical optimization of the directivity of optical travelling wave antennas\nmade from low-loss dielectric materials using full-wave numerical simulations\nin conjunction with a particle swarm optimization algorithm. The antennas are\ncomposed of a reflector and a director deposited on a glass substrate and an\nemitter placed in the feed gap between them serves as an internal source of\nexcitation. In particular, we analysed antennas with rectangular- and\nhorn-shaped directors made of either Hafnium dioxide or Silicon. The optimized\nantennas produce highly directional emission due to the presence of two\ndominant guided TE modes in the director in addition to leaky modes. These\nguided modes dominate the far-field emission pattern and govern the direction\nof the main lobe emission which predominately originates from the end facet of\nthe director. Our work also provides a comprehensive analysis of the modes,\nradiation patterns, parametric influences, and bandwidths of the antennas that\nhighlights their robust nature.\n