Terahertz pulse propagation in the near field and the far field
JOSA A, Vol. 17, Issue 1, pp. 74-83 (2000)
http://dx.doi.org/10.1364/JOSAA.17.000074
Acrobat PDF (372 KB)
Abstract
We present a detailed investigation of the propagation properties of beams of ultrashort terahertz (THz) pulses emitted from large-aperture (LA) antennas. The large area of the emitter is demonstrated to have substantial influence on the temporal pulse profile in both the near field and the far field. We perform a numerical analysis based on scalar and vectorial broadband diffraction theory and are able to distinguish between near-field and far-field contributions to the total THz signal. We find that the THz beam from a LA antenna propagates like a Gaussian beam and that the temporal profile of the THz pulse, measured in the near field, contains information about the temporal and spatial field distribution on the emitter surface, which is intrinsically connected to the carrier dynamics of the antenna substrate. As a result of pulse reshaping, focusing of the THz beam leads to a reduced relative pulse momentum, with implications in THz field-ionization experiments.
© 2000 Optical Society of America
[Optical Society of America ]
OCIS Codes
(260.1960) Physical optics : Diffraction theory
(260.3090) Physical optics : Infrared, far
(320.5390) Ultrafast optics : Picosecond phenomena
(320.5540) Ultrafast optics : Pulse shaping
Citation
Andreas Gürtler, Carsten Winnewisser, Hanspeter Helm, and Peter Uhd Jepsen, "Terahertz pulse propagation in the near field and the far field," J. Opt. Soc. Am. A 17, 74-83 (2000)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-17-1-74
You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
Related Journal Articles 
- Conductivity artifacts in optical-pump THz-probe measurements of YBa2Cu3O7 (JOSAB)
- Diffraction-induced transformation of near-cycle and subcycle pulses (JOSAB)
- Intraband carrier kinetics and picosecond pulse shaping in field-enhanced bulk semiconductor absorbers (OL)
- Pulse deformations at guided-mode resonance filters (OE)
- Paraxial localized waves in free space (OE)
Related Conference Papers
- Feasible Light Fields in Three-Dimensional Space
- Feasible Light Fields in Three-Dimensional Space
- Typesetting THz waveforms
- Numerical analysis of spatio-temporal coupling in time domain microscope
- Diffraction properties of multilayer transmission volume holographic grating under an ultrashort pulsed beam with arbitrary polarization state
« Previous Article | Next Article »
OSA is a member of 