Self-rotation terahertz transmitter and terahertz wave generating method

A transmitter and terahertz technology, applied in the direction of solid-state lasers, etc., can solve the problems of small spin Hall angle, inability to generate instantaneous charge flow, and insignificant terahertz radiation effect, and achieve wide pulse width, simple structure and low cost. low effect

Pending Publication Date: 2019-04-23
BEIHANG UNIV
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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 t...

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  • Self-rotation terahertz transmitter and terahertz wave generating method

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Embodiment Construction

[0014] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0015] An embodiment of the present invention provides a spin terahertz emitter, including at least a femtosecond laser, a topological thin film, and a magnetic field generator. The pump light output by the femtosecond laser passes through the topological thin film to generate The generator generates a terahertz wave in the direction of the magnet...

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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...

Claims

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Application Information

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IPC IPC(8): H01S1/02
CPCH01S1/02
Inventor 聂天晓吴晓君王航天赵海慧
Owner BEIHANG UNIV
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