We study the focusing efficiency of multilevel diffractive lenses as a function of <i>f</i>-number. Both scalar and rigorous analyses are performed on two- and three-dimensional lenses. We show that shadowing in lenses with small <i>f</i>-numbers is a critical factor that limits their performance. We show further that scalar analysis does not accurately predict the effects of shadowing for lenses with long <i>f</i>-numbers and large numbers of phase levels.
© 2001 Optical Society of America
(050.0050) Diffraction and gratings : Diffraction and gratings
Dennis W. Prather, David Pustai, and Shouyuan Shi, "Performance of Multilevel Diffractive Lenses as a Function of f-Number," Appl. Opt. 40, 207-210 (2001)