Abstract

The emergence of photoconductive antennas (PCAs) has played an integral role in the development of THz technology which paved the way to various and extensive practical applications of THz radiation. PCAs which are semiconductor-based antennas are used in the generation and detection of THz wave. Other promising way of generating THz radiation is by Inverse Spin Hall Effect (ISHE) using spintronic heterostructures composed of ferromagnetic (FM) and nonmagnetic (NM) metals [1]. Although this emerging THz source offers unique advantages over other conventional sources, THz generation is not as efficient compared to other sources. In recent studies [2-3], two-fold improvement was achieved when antennas were incorporated on spintronic THz sources. In this paper, we present THz wave generation and emission properties of diabolo and rectangular spintronic antennas and compare their performances with an unstructured spintronic film composed of 2 nm Fe and 3 nm Pt layer. As illustrated in Fig. 1(a), the antenna gaps are consisted of 2 nm Fe and 3 nm Pt layers while the antenna flares are 200 nm thick Pt layers.

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