Topological Dirac semi-metals as novel, optically-switchable, helicity-dependent terahertz sources
Topological Dirac semi-metals as novel, optically-switchable, helicity-dependent terahertz sources
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拓扑狄拉克半金属作为新型、光学可切换、螺旋度相关的太赫兹源
DOI：
10.1109/irmmw-thz50927.2022.9895566
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Boland J
中科院分区：
文献类型：
--
作者：
Boland J
太赫兹脉冲的产生和控制对于实现太赫兹辐射在包括6G通信、安全和成像在内的多个领域的潜力至关重要。在这项工作中，我们提出了拓扑狄拉克半金属砷化镉作为一种新的螺旋度相关的太赫兹源。我们显示了宽带（单周期）和窄带（多周期）太赫兹脉冲在近红外光激发斜入射。通过改变光激发脉冲的入射角，也可以实现对发射频率的控制，从而为可调谐窄带太赫兹源提供候选。
The generation and control of terahertz pulses is vital for realizing the potential of terahertz radiation in several sectors, including 6G communication, security and imaging. In this work, we present the topological Dirac semimetal cadmium arsenide as a novel helicity-dependent terahertz source. We show both broadband (single-cycle) and narrowband (multi-cycle) terahertz pulses upon near-infrared photoexcitation at oblique incidence. By varying the incident angle of the photoexcitation pulse, control of the emission frequency can also be achieved, providing a candidate for a tuneable narrowband terahertz source.