We describe a transmission dark-field digital holographic microscope based on a Mach–Zehnder configuration for the detection of nanosize objects or objects smaller than the optical resolution limit. An optical stop adequately placed in the object beam removes the nondiffracted beam while keeping the light scattered by the object. This configuration combines an improved detection of objects smaller than the optical resolution with the refocusing capability yielded by digital holography. A theoretical analysis and an experimental demonstration are provided.
© 2008 Optical Society of America
Original Manuscript: June 13, 2008
Revised Manuscript: September 23, 2008
Manuscript Accepted: September 23, 2008
Published: November 10, 2008
Vol. 4, Iss. 1 Virtual Journal for Biomedical Optics
Frank Dubois and Patrick Grosfils, "Dark-field digital holographic microscopy to investigate objects that are nanosized or smaller than the optical resolution," Opt. Lett. 33, 2605-2607 (2008)