The 81st JSAP Autumn Meeting, 2020

Presentation information

Oral presentation

4 JSAP-OSA Joint Symposia 2020 » 4.6 Terahertz Photonics

[9p-Z23-1~11] 4.6 Terahertz Photonics

Wed. Sep 9, 2020 1:00 PM - 5:00 PM Z23

Masaaki Tsubouchi(QST), Masaya Nagai(Osaka Univ.)

2:30 PM - 2:45 PM

[9p-Z23-5] THz Emission Amplitude Enhancement of Fe/Pt Diabolo-shaped Spintronic Antennas Fabricated on MgO Substrates

〇(D)Miezel Legurpa Talara1, Dmitry Bulgarevich2, Valynn Katrine Mag-usara1,3, Chiyaka Tachioka1, Joselito Muldera1, Hideaki Kitahara1,3, Mary Clare Escano1, Makoto Nakajima3, Makoto Watanabe2, Masahiko Tani1 (1.Res. Ctr. for Dev. of Far-Infrared Region, Univ. of Fukui, 2.Res. Ctr. for Structural Materials, Nat. Inst. for Mat. Sci., 3.Inst. of Laser Eng., Osaka Univ.)

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.