Figure 3
From: High-Energy, Short-Duration Bursts of Coherent Terahertz Radiation from an Embedded Plasma Dipole
The radiation emitted, corresponding to the simulation of Fig. 2. (a) The x-direction electric field (E x ) 0.54 ps after the pulse collision. The plasma is located in the region enclosed by the dashed lines. The plasma density is uniform along x, and trapezoidal in y with 10 μm-ramps at both ends and a 20 μm-plateau. Radiation fields are “measured” by virtual probes located at a distance of 70 μm from the dipole centre, at 0° and 30°, respectively. (b,c). Evolution of the (E x ) component of the electric field polarized in the x-y-plane, and B z , determined at the probe positions. (d) Power spectrum of E x in (b). (e) The leading peak of B z of the radiated pulse vs. emission angle. The solid lines are fitting curves to Acosϕ. ϕ is the angle from the normal to the plasma strip and A is a fitting parameter, which corresponds to the peak amplitude of the radiated pulse. (f) Peak amplitude of B z (i.e. A) vs. distance from the dipole centre.
