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Experimental setup for coded excitation of broadband terahertz. The emitter is a PLN crystal. The optical probe beam passes through a Glan-Thompson (GT) polarizer, a quarter-wave plate (QWP) and a Wollaston prism (WP) before illuminating a balanced photodetector (BPD).
Pitch-catch measurement of coded excitation. (a) Encoded wave form. The axis is time in ps and the axis is the normalized signal amplitude. (b) Zoom view of a portion of the encoded signal. The arrows indicate phase flips in the signal. (c) Digitally compressed signal. (d) Spectra of the two signals. The encoded and decoded spectra are shown by the gray and black curves, respectively. The axis is frequency in THz, while the axis is normalized magnitude in dB.
(a) Geometry for two-dimensional imaging. (b) Synthetic terahertz array and the image plane. (c) An encoded signal from the data set. (d) The same signal after decoding by pulse compression filter.
(a) Reconstructed image from decoded data set using PLN emitter. (b) Reconstructed image using a ZnTe emitter. The scale bar represents in the image plane.
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