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Temporal wave form (upper figure) and spectrum (lower figure) of THz waves measured by the GaSe (solid line) crystal and the ZnTe (dotted line) crystal, respectively.
(a) Time-domain THz waveform measured by a GaSe crystal. By tilting the angle between the incident beam and normal orientation of the surface, different time-domain THz wave forms achieved at , 20°, 40°, and 60°, respectively. (b) Corresponding spectra of the wave forms in (a).
THz wave peak amplitude vs azimuthal angle for both GaSe emitter and sensor. The dots are experimental data and the line is a curve fit of .
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