TY - GEN
T1 - An Optimization of Impedance-Modulated Passive and Lossless Metasurfaces for Expansion of a Gaussian Beam
AU - Tumashov, Maksim
AU - Epstein, Ariel
AU - Killamsetty, Vinay
AU - Glybovski, Stanislav
N1 - Funding Information: This work was supported by the Russian Science Foundation (Project No. 21-79-30038). Publisher Copyright: © 2022 IEEE.
PY - 2022
Y1 - 2022
N2 - We study a reflectionless transformation of an incident Gaussian beam in which the transmitted beam increases its waist. A 2D problem is solved analytically and numerically. The incident beam is diffracted on a synthesized spatially-modulated omega-bianisotropic meta-surface. The electric impedance, magnetic admittance, and magnetoelectric coupling coefficient were obtained using numerical optimization based on analytical formulas assuming evanescent surface waves propagating over the metasurface. In two examples with different output beam widths, the optimization results were verified by full-wave simulations with a transmission efficiency of over 90% for a triple-impedance-layer representation of the structure. The proposed approach could be used efficiently to provide any other output beam profile if it satisfies the local power conservation principle.
AB - We study a reflectionless transformation of an incident Gaussian beam in which the transmitted beam increases its waist. A 2D problem is solved analytically and numerically. The incident beam is diffracted on a synthesized spatially-modulated omega-bianisotropic meta-surface. The electric impedance, magnetic admittance, and magnetoelectric coupling coefficient were obtained using numerical optimization based on analytical formulas assuming evanescent surface waves propagating over the metasurface. In two examples with different output beam widths, the optimization results were verified by full-wave simulations with a transmission efficiency of over 90% for a triple-impedance-layer representation of the structure. The proposed approach could be used efficiently to provide any other output beam profile if it satisfies the local power conservation principle.
UR - https://www.scopus.com/pages/publications/85142836432
U2 - 10.1109/Metamaterials54993.2022.9920881
DO - 10.1109/Metamaterials54993.2022.9920881
M3 - Conference contribution
T3 - 2022 16th International Congress on Artificial Materials for Novel Wave Phenomena, Metamaterials 2022
SP - X463-X465
BT - 2022 16th International Congress on Artificial Materials for Novel Wave Phenomena, Metamaterials 2022
T2 - 16th International Congress on Artificial Materials for Novel Wave Phenomena, Metamaterials 2022
Y2 - 12 September 2022 through 17 September 2022
ER -