Keywords:spintronic antennas, THz antennas, spintronics
In this paper, we report on THz emission amplitude performance of Fe/Pt diabolo-shaped spintronic antennas fabricated on MgO substrates. We performed THz-time domain spectroscopy (TDS) measurements of diabolo-shaped spintronic antenna with Fe and Pt thicknesses of 2 nm and 3 nm, respectively, and of diabolo-shaped spintronic antenna with Fe = 2 nm and Pt = 100 nm at both antenna flares. Results showed that the diabolo-shaped antenna with the same metal thicknesses with that of the spintronic bilayer showed ~51% improvement which may have been caused by the enhanced outcoupling of THz radiation brought by the diabolo-shaped structure. Moreover, the diabolo-shaped antenna with thicker Pt showed ~88% improvement. This improvement can be attributed to the enhanced coupling of THz wave to free space and improved radiation directivity. For THz detection, we used an LTG-GaAs dipole-type photoconductive antenna (PCA) with 2. 6 mW and 4.7 mW pump and probe power, respectively.