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Thin metal wires are known to be a low loss and very low dispersion terahertz (THz) waveguide [1]. Recently, generation of a strong THz surface wave was demonstrated by irradiating a wire surface with a ultrahigh intensity femtosecond laser [2]. Such THz light sources driven by femtosecond laser induced plasma are expected to have a high potential as a power scalable source. However, the characteristics and mechanism of the laser-plasma driven surface wave generation on wires are not fully understood. In this study, for the first time, we quantitatively measured the waveforms of THz surface waves depending on radial position, wire diameter, and laser pulse energy by using electro-optical (EO) sampling technique.
© 2017 IEEE
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