Abstract-Half-cycle terahertz surface waves with MV/cm field strengths generated on metal wires

Kensuke Teramoto, Shigeki Tokita, Tokinori Terao, Shunsuke Inoue,  Ryo Yasuhara,  Takeshi Nagashima, Sadaoki Kojima, Junji Kawanaka,  Kazuaki Mori ,Masaki Hashida, Shuji Sakabe,

Schematic of the experimental setup for electro-optical measurement of a THz surface wave. The observation point is located 100 mm from the laser focal point at radial distance r (mm) from the wire center.

https://aip.scitation.org/doi/abs/10.1063/1.5031873


Irradiating a metal wire with an intense femtosecond laser pulse induces a terahertz (THz) surface wave that travels along the wire. Here, the characteristics of the THz surface wave generated by the laser–wire interaction are investigated in detail by using an electro-optical method to determine the dependence of surface wave properties on laser energy and wire diameter. The surface wave is distributed by the Hankel function in the wire radial direction. On the wire surface, the electric field is estimated to be MV/cm. The peak electric field of the surface wave and the conversion efficiency from laser energy to surface wave energy are found to be proportional to the laser energy raised to the power of 0.67 and 0.3, respectively.

Abstract-Induction of subterahertz surface waves on a metal wire by intense laser interaction with a foil

Kensuke Teramoto, Shunsuke Inoue, Shigeki Tokita, Ryo Yasuhara, Yoshihide Nakamiya, Takeshi Nagashima, Kazuaki Mori, Masaki Hashida, and Shuji Sakabe

https://journals.aps.org/pre/abstract/10.1103/PhysRevE.97.023204

We have demonstrated that a pulsed electromagnetic wave (Sommerfeld wave) of subterahertz frequency and 11-MV/m field strength can be induced on a metal wire by the interaction of an intense femtosecond laser pule with an adjacent metal foil at a laser intensity of $8.5\times {10}^{18}W/c{m}^2$. The polarity of the electric field of this surface wave is opposite to that obtained by the direct interaction of the laser with the wire. Numerical simulations suggest that an electromagnetic wave associated with electron emission from the foil induces the surface wave. A tungsten wire is placed normal to an aluminum foil with a gap so that the wire is not irradiated and damaged by the laser pulse, thus making it possible to generate surface waves on the wire repeatedly.

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Abstract-Induction of sub-terahertz surface wave on a metal-wire by intense laser interaction with a foil

Kensuke Teramoto, Shunsuke Inoue, Shigeki Tokita, Ryo Yasuhara, Yoshihide Nakamiya, Takeshi Nagashima, Kazuaki Mori, Masaki Hashida, and Shuji Sakabe

https://journals.aps.org/pre/accepted/d4074Y14Qd812c64160d2058a2d69614bb667cd2d

We have demonstrated that a pulsed electromagnetic wave (Sommerfeld wave) of sub-terahertz frequency and 11-MV/m field strength can be induced on a metal wire by the interaction of an intense femtosecond laser pule with an adjacent metal foil at a laser intensity of 8.5\texttimes 10\mathrm{18\thinspace }W/cm2. The polarity of the electric field of this surface wave is opposite to that obtained by the direct interaction of the laser with the wire. Numerical simulations suggest that an electromagnetic wave associated with electron emission from the foil induces the surface wave. A tungsten wire is placed normal to an aluminum foil with a gap so that the wire is not irradiated and damaged by the laser pulse, thus making it possible to generate surface waves on the wire repeatedly.

Abstract-Directional linearly polarized terahertz emission from argon clusters irradiated by noncollinear double-pulse beams

 Kazuaki Mori, Masaki  Hashida, Takeshi  Nagashima, Dazhi Li, Kensuke Teramoto, Yoshihide Nakamiya, Shunsuke Inoue, Shuji Sakabe,

http://aip.scitation.org/doi/abs/10.1063/1.4991736

It has been demonstrated that the interaction between argon clusters and intense femtosecond double laser pulses with appropriate intervals in time and space provides important properties for terahertz electromagnetic wave generation, namely, high forward directivity, power enhancement, and linear polarization with a variable direction. Irradiating argon clusters with double pulses (1 and 3 mJ, 40 fs, 810 nm) in 133-ps and 40-μm intervals results in terahertz wave emission in the forward direction that is 10 times greater than that for a single pulse. The polarization direction of terahertz electromagnetic waves can be varied by changing the relative focal positions of the first and second pulses.