Spatiotemporal shaping of terahertz pulses
Jake Bromage, Stojan Radic, G. P. Agrawal, C. R. Stroud, Jr.,
P. M. Fauchet and Roman Sobolewski
Opt. Lett. 22, 627 (1997).
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We report temporal shaping of few-cycle terahertz
pulses using a slit in a conductive screen as a high-pass filter. The
filter's cut-off frequency was tuned by changing the width of the slit;
the slope of the cut-off transition was altered by changing the
thickness of the screen. We measured the transmission function of the
filters, using large-aperture photoconducting antennas to create and
detect the incident and transmitted electric field. Our experimental
results were in excellent agreement with the performed finite-difference
time-domain simulations of the propagation of the pulse through the
slit. When the screen thickness was greater than the slit width, the
filter was well-modelled by a short, planar waveguide. Using a simple
transfer function, we accurately describe the sharp cut-off and
dispersion of such a filter.
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