Cylindrical dielectric diffractive microlenses are designed by the use of rigorous electromagnetic diffraction theory, and their performances are compared with microlenses based on a conventional scalar design concept. Microlenses with a relief of four depth levels are considered as well as binary microlenses with subwavelength structures. We show that the density of energy in the focus of high-numerical-aperture microlenses can be significantly increased if the phase distribution of the transmitted electrical field is optimized.
© 1997 Optical Society of America
Original Manuscript: August 9, 1996
Revised Manuscript: October 24, 1996
Manuscript Accepted: October 27, 1996
Published: April 1, 1997
Martin Schmitz and Olof Bryngdahl, "Rigorous concept for the design of diffractive microlenses with high numerical apertures," J. Opt. Soc. Am. A 14, 901-906 (1997)