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Terahertz plasmonic surface waves have attracted enormous attention even since the observation of extraordinary transmission of the terahertz waves in a periodic metallic array of subwavelength apertures. Quantitative analysis of the near-field behavior and contribution of surface plasmons to the transmission enhancement still remains challenging. By use of near-field scanning terahertz microscopy and numerical simulation, we study launching, propagation, and focusing of plasmonic surface waves with an ultimate goal of in-depth understanding the near-field characteristics of plasmonic terahertz surfaces waves.
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