2014/07/04 by Jitao Zhang, Zhang, Jitao
Engineering · Physics and Astronomy · #FOS: Physical sciences #Gyrotron and Vacuum Electronics Research #Millimeter-Wave Propagation and Modeling #Optics (physics.optics) #Terahertz technology and applications #physics.optics
paper · pdf · doi:10.48550/arxiv.1407.1095
7 pages, 4 figures
arxiv created 2014/07/04 · openalex publication_date 2014/07/04 · arxiv updated 2014/07/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The enhanced terahertz radiation from a new photoconductive antenna (PCA) has been predicted by numerical simulation. Different from the conventional PCA, the proposed PCA has electrodes with sawtooth structures on the edge, which will introduce stronger localized bias field than common electrode (e.g. strip-line structure). In addition, the elliptical beam of the laser source is used to illuminate the sawtooth structure of the PCA, so that the effective region of the terahertz excitation is enlarged and higher laser power can be applied before saturation effect occurs. The design of the proposed PCA is presented, and its performance is predicated by numerical analysis based on the full-wave finite-difference-time-domain method. The simulated result shows that, comparing with a conventional PCA, the proposed PCA achieves 1.4 times enhancement of the THz radiation field(i.e. peak of the time-domain THz pulse) at the same condition. Further enhancement as high as 2 times can be achieved when considering the upper limit of the power density of the incoming laser beam.