Check out this great work where we showed how the annihilation of the phase singularity changes the transmission.
APL Photonics 6, 016101 (2021); https://doi.org/10.1063/5.0031602
The first paper of 2021! Have a wonderful new year!
The paper by Farhad and Alireza has been published in APL Photonics as an Editor's pick!