title: Application of terahertz Gouy phase shift from curved surfaces for estimation of crop yield.
abstract: The application of terahertz time-domain spectroscopy (THz-TDS) and imaging to differentiate flat and curved surfaces in reflection via the THz Gouy phase shift is demonstrated. For a THz-TDS system that is aligned for reflection from a flat surface, the presence of a curved surface displaces the image focal plane from the detector plane, resulting in a Gouy phase shift. The potential of utilizing this configuration for estimating the number and size of curved objects is discussed with particular emphasis on agriculture crop yield estimates.
authors.affiliation: Department of Physics, New Jersey Institute of Technology, Newark, New Jersey 07102, USA. federici@adm.njit.edu
authors.forename: John F
authors.initials: JF
authors.lastname: Federici
authors.forename: Robert L
authors.initials: RL
authors.lastname: Wample
authors.forename: David
authors.initials: D
authors.lastname: Rodriguez
authors.forename: Suman
authors.initials: S
authors.lastname: Mukherjee