[11p-N404-1~9] 4.6 Terahertz Photonics

▲ [11p-N404-8] Terahertz Magneto-Optic Sensing/Imaging using a Diabolo-Shaped Antenna with Thin Spintronic Layer between its Flares

〇(D)Miezel Legurpa Talara¹、Dmitry Bulgarevich²、Chiyaka Tachioka¹、Valynn Katrine Mag-usara^3,1、Hideaki Kitahara¹、Makoto Nakajima³、Makoto Watanabe²、Masahiko Tani¹ (1.Res. Ctr. for Dev't. of Far-Infrared Region, Univ. of Fukui, Jpn、2.Res. Ctr. for Structural Materials, NIMS, Tsukuba, Jpn、3.Laser THz Res. Div., Inst. of Laser Eng., Osaka Univ., Jpn)

キーワード：magneto-optic imaging (MOI), spintronic THz radiation source, spintronic antenna

In this paper we will present the continued development of our recently reported original magneto-optic imaging (MOI) with on-chip terahertz time-domain spectroscopy (THz-TDS) emission/detection scheme by using a diabolo-shaped emitter with 2/3-nm Fe/Pt spintronic layer at the gap of its 100-nm thick Pt antenna flares. The advantages of such structure were recently reported and explained by the combination of the enhanced outcoupling of THz radiation to free space brought by the shaped structure and the reduced sheet resistance of the thicker metallic flares of the diabolo-shaped antenna. Our obtained MOI images showed better signal-to-noise ratio for THz waveforms compared to previously reported ones from continuous spintronic film or uniformly thin spintronic diabolo antenna.