Self-rotation terahertz transmitter and terahertz wave generating method

Abstract

The embodiment of the invention provides a self-rotation terahertz transmitter and a terahertz wave generating method. The self-rotation terahertz transmitter at least comprises a femtosecond laser, atopological structure film and a magnetic field generator, wherein pumping light output by the femtosecond laser passes through the topological structure film to generate terahertz waves on the basisof the magnetic field direction of the magnetic field generator; the topological structure film comprises a topological insulation body layer, a ferromagnetic layer and a non-ferromagnetic layer; thetopological insulation body layer, the ferromagnetic layer and the non-ferromagnetic layer are sequentially arranged and attached and form a heterogeneous structure. The transmitter provided by the embodiment of the invention has the advantages that the structure is simple; the transmission principle is simple; the transmission frequency is high; the pulse width is wide; the cost is low.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of terahertz pulse generation, and in particular to a spin terahertz emitter and a method for generating terahertz waves. Background technique [0002] Terahertz (THz) waves are between far-infrared and microwaves, covering the frequency range from 0.1 to 10 THz. Hertzian pulses are resonant probes of the excitation of many low-energy elements in condensed matter. Terahertz waves have many unique properties, such as transmission, safety, strong spectral resolution, etc. These properties endow terahertz waves with a wide range of application prospects, including terahertz radar and communication, spectroscopy and imaging, non-destructive flaw detection, security detection etc. [0003] However, terahertz applications still have a strong demand for terahertz radiation sources with high efficiency, high power, low cost, and room temperature operation. At present, the commonly used terah...

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Problems solved by technology

However, although many studies have shown that ferromagnetic / nonmagnetic metal heterostructure bilayers can generate terahertz radiation under femtosecond laser irradiation, due to the small spin Hall angle of tungsten or platinum, they cannot generate enough terahertz radiation. Instantaneous charge flow, the final terahertz radiation effect is not significant

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