title: Trimodal imaging system capable of quantitative phase imaging without 2 pi ambiguities.
abstract: A neoteric approach to interferometric phase imaging unencumbered by 2 pi phase ambiguities is presented. This technique utilizes an actively controlled angular displacement glass plate positioned in the reference arm of an environmentally stabilized pseudoheterodyne Mach-Zehnder interferometer. The plate is continually adjusted to maintain a constant interferometric output phase, as a phase object in the sample arm is raster scanned. Using a 632.8 nm source, unwrapped phase images of translucent samples ranging from approximately 150 nm to 1.5 microm thick were obtained. This system is incorporated into a conventional near-field scanning optical microscope, which permits simultaneous phase, intensity, and surface morphology studies.
authors.affiliation: Department of Physics and Optical Science, University of North Carolina Charlotte, Charlotte, NC 28223, USA. kedward@uncc.edu
authors.forename: Kert
authors.initials: K
authors.lastname: Edward
authors.forename: Terrill W
authors.initials: TW
authors.lastname: Mayes
authors.forename: Bob
authors.initials: B
authors.lastname: Hocken
authors.forename: Faramarz
authors.initials: F
authors.lastname: Farahi