Chengpeng Yu and Shenggang Liu
https://journals.aps.org/prapplied/accepted/8e076OfbK2412f3ea38e6805b1e14fbed85327339
We present a novel terahertz (THz) radiation source combining the principles of spintronics and vacuum electronics: Electronic-Spintronic THz Emitter (E-STE). Different from the traditional laser driven Spintronic THz Emitters, E-STE is driven by low energy electron beams. Working through four steps: the electron beam excitation of hot electrons, the electron super-diffusion, the Inverse Spin Hall Effect, and the diffraction radiation of the periodic gratings, E-STE is able to emit continuous, monochromatic THz radiation. Detailed theoretical modeling and numerical calculation show, E-STE can cover the whole THz frequency regime (0.1-10THz) by modifying the period of the gratings. The electron beam voltage and current are relatively low (voltage U=5V, 25V, peak current I~100mA), while the radiation power density and working efficiency are relatively high (The power density can reach 108W/cm2, the working efficiency can reach 25 high-power E-STE may contribute to the development of THz radiation source integrated on chip.
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