title: Defining the Fresnel zone for broadband radiation.
abstract: The concept of the Fresnel zone is central to many areas of imaging. In tomographic imaging, the transverse spatial resolution can be limited by the size of the first Fresnel zone, usually defined only for monochromatic radiation. With the increasing prevalence of broadband tomographic imaging systems, a generalization of this concept is required. Here, a proposed generalization is described in the context of femtosecond optics, and experimentally verified using terahertz time-domain spectroscopy. Based on this definition, a simple zone plate design is demonstrated.
authors.affiliation: Department of Electrical and Computer Engineering, Rice University, MS-366, P.O. Box 1892, Houston, Texas 77251, USA.
authors.forename: Jeremy
authors.initials: J
authors.lastname: Pearce
authors.forename: Daniel
authors.initials: D
authors.lastname: Mittleman