Comparison of electromagnetic and scalar methods for evaluation of efficiency of diffractive lenses for wide spectral bandwidth

• We studied the diffractive lenses (DL) with two-layer microstructure.
• The DLs efficiency dependencies on wavelength and angle of incidence were studied.
• These studies were carried out by electromagnetic and scalar methods.
• The results were compared.
• We determined the conditions under which DL exhibits the highest efficiency.

The results of comparing the dependencies of the diffraction efficiency of the diffractive lens on the wavelength and the angle of incidence are presented. These dependencies were obtained using electromagnetic and scalar methods for a two-layer microstructure with internal and external reliefs. We determined the microstructure conditions under which the diffractive lens, a part of the wide-spectral optical system, exhibits the highest diffraction efficiency.