Terahertz annular antenna driven with a short intense laser pulse

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Abstract

Generation of terahertz radiation by an oscillating discharge, excited by short laser pulses, may be controlled by geometry of the irradiated target. In this work, an annular target with a thin slit is considered as an efficient emitter of secondary radiation when driven by a short intense laser pulse. Under irradiation, a slit works as a diode, which is quickly filled by dense plasmas, closing the circuit for a traveling discharge pulse. Such a diode defines the discharge pulse propagation direction in a closed contour, enabling its multiple passes along the coil. The obtained oscillating charge efficiently generates multi-period quasi-monochromatic terahertz waves with a maximum along the coil axis and controllable characteristics.

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Bukharskii, N., Kochetkov, I., & Korneev, P. (2022). Terahertz annular antenna driven with a short intense laser pulse. Applied Physics Letters, 120(1). https://doi.org/10.1063/5.0076700

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