title: Generating an adjustable three-dimensional dark focus.
abstract: Conditions for generating a dark focus surrounded by light in all three dimensions are presented. A simple technique for generating such a dark region is demonstrated experimentally. The method is compared with previous attempts at creating a three-dimensional dark focus.
authors.affiliation: Harvard Medical School and the Wellman Center for Photomedicine, Massachusetts General Hospital, 55 Fruit Street, BAR 703, Boston, Massachusetts 02114, USA. dyelin@partners.org
authors.forename: Dvir
authors.initials: D
authors.lastname: Yelin
authors.forename: Brett E
authors.initials: BE
authors.lastname: Bouma
authors.forename: Guillermo J
authors.initials: GJ
authors.lastname: Tearney