Spintronic THz emitters, consisting of Ta/Co/Pt trilayers patterned into rectangles of size 10 µm, have been integrated in planar electromagnetic antennas of various types (dipole, bow-tie, spiral). Antenna dimensions and shapes have been optimized with the help of electromagnetic simulations so as to maximize antenna efficiency in both narrow-band and broad-band geometries at/around 1 THz. The THz emission has been characterized using a pump-probe free space electro-optic sampling set-up, both for a single emitter geometry and for arrays of emitters. An increase of the detected THz signal is observed for all antenna geometries, with an enhancement ratio up to a factor of ten, together with changes of the emission bandwidth consistent with simulated characteristics.
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Pacé et al. (2024) studied this question.
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