Experimental and Computational Analysis of Broadband THz Photoconductive Antennas

Figure 8

Experimental measurements of THz radiated signals of the bowtie, slotted, fractal, circular PCAs and a commercial PCA. (a) Time-domain pulses, (b) frequency-domain spectrum obtained using FFT. Both a and b are obtained without using pinholes. (c, d) Figures obtained using a 1 mm pinhole. (e, f) Figures obtained using a 0.5 mm pinhole. The spikes in the spectrum indicate to water signatures as experiments were conducted in the air without purging with nitrogen gas. Each spectrum is normalized to its maximum value.

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