Enhancement of THz emission in WSe2/FeCo structure

Abstract

The last 10 years have been very productive in terms of studies on pulsed THz radiation sources, in which generation occurs when interacting with short laser pulses. The study of new materials in order to improve THz radiation sources characteristics is a very promising research area.
In modern spintronic emitters, the spin-polarized currents create the THz field. Recent studies have shown that spintronic emitters not only generate THz radiation more efficiently, but they can also be used to control the characteristics of the generated radiation[1–3]. However, efficiency increase of THz emitters is always on agenda.
One promising method to improve the efficiency of spintronic emitters is by coating them with transition metal dichalcogenides nanolayers[4]. Theoretical works demonstrate that this way, greater amplification of the generated THz radiation in the reflection geometry can be achieved[5]. In our work, we report a method for increasing the efficiency of spintronic THz emitters based on FeCo using two-dimensional mechanically exfoliated WSe2 flakes. THz generation was measured by THz time-domain spectroscopy technique. We showed an order of magnitude enhancement of THz emission in reflection geometry by FeCo/WSe2 structures. Our results show that such structures are an impressive candidate for terahertz emitters because they are cheap and highly efficient.
The research was supported by Russian Science Foundation № 21-79-10353, https://rscf.ru/en/project/21-79-10353/. Fabrication of the FeCo films was supported by French RENATECH network.


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Dinar Khusyainov
MIREA-Russian Technological university
Russia

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