title: Preoptimization improvements to subwavelength diffractive lenses.
abstract: We present preoptimization strategies for improving the design of diffractive lenses in the electromagnetic domain, with few or no electromagnetic analyses. We find that improvements can be substantial, in some cases even to the point that extensive electromagnetic optimization gives only marginal additional improvement.
authors.affiliation: Microphotonics Branch, Army Research Laboratory, Adelphi, Maryland 20783, USA. dmackie@arl.army.mil
authors.forename: David M
authors.initials: DM
authors.lastname: Mackie
authors.forename: Dennis W
authors.initials: DW
authors.lastname: Prather
authors.forename: Shouyan
authors.initials: S
authors.lastname: Shi