We study the focusing efficiency of multilevel diffractive lenses as a function of f-number. Both scalar and rigorous analyses are performed on two- and three-dimensional lenses. We show that shadowing in lenses with small f-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 f-numbers and large numbers of phase levels.
© 2001 Optical Society of America
(050.0050) Diffraction and gratings : Diffraction and gratings
Original Manuscript: February 16, 2000
Revised Manuscript: October 11, 2000
Published: January 10, 2001
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)