Late-time target response measured with terahertz impulse ranging

Author

Cheville, R. Alan ; McGowan, Roger W. ; Grischkowsky, Daniel R.

Author_Institution

Sch. of Electr. & Comput. Eng., Oklahoma State Univ., Stillwater, OK, USA

Volume

45

Issue

10

fYear

1997

fDate

10/1/1997 12:00:00 AM

Firstpage

1518

Lastpage

1524

Abstract

Time-domain impulse-scattering measurements of freely propagating single cycle terahertz radiation from dielectric targets is measured in the far field with subpicosecond resolution. Initial specular reflection as well as late-time response of the targets is observed to approximately 100 times the initial pulse width. Measured scattered fields agree well with the calculated scattering for early- and late-time response in both the time and frequency domains. The data is fit to both an inverse Fourier transform of numerically calculated frequency domain scattering as well as an intuitive model based on physical optics (PO). The PO picture is verified directly in the time domain and surface wave propagation velocities are measured

Keywords

Fourier transforms; distance measurement; electric field measurement; electromagnetic fields; electromagnetic wave propagation; electromagnetic wave reflection; electromagnetic wave scattering; inverse problems; laser ranging; magnetic field measurement; physical optics; surface electromagnetic waves; time-domain analysis; PO; calculated scattering; dielectric targets; early time response; far field; frequency domain; frequency domain scattering; inverse Fourier transform; late time response; late time target response measurement; measured scattered fields; physical optics; pulse width; single cycle terahertz radiation; specular reflection; subpicosecond resolution; surface wave propagation velocities; terahertz impulse ranging; time domain; time domain impulse scattering measurements; ultrashort laser pulses; Dielectric measurements; Frequency domain analysis; Optical pulses; Optical reflection; Optical scattering; Space vector pulse width modulation; Submillimeter wave measurements; Submillimeter wave propagation; Time domain analysis; Time measurement;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.633860

Filename

633860