Nondiffracting Millimeter Waves Beams Generated by Diffractive Optical Elements

In our paper, diffractive optical elements (DOE's) are designed for generation nondiffracting millimeter wave beams. In order to reduce the computational burden, the design tool, which employs a microgenetic algorithm (MGA) for optimal design of DOE's in conjunction with a body-of-revolution finite-difference time-domain (BOR-FDTD) method for rigorous analysis of the diffracted fields, has been introduced for the first time to obtain the DOE's profiles. Numerical results demonstrate that the field distributions diffracted by the designed DOE's agree well with that of desired on the output plane.