Spinning electron terahertz wave emitter based on voltage-controlled magnetization

A spintronic and terahertz wave technology, applied in solid-state lasers and other directions, can solve the problems of poor controllability, high energy consumption, low efficiency, etc., and achieve the effect of low cost and cost reduction

Pending Publication Date: 2019-05-31
BEIHANG UNIV
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Problems solved by technology

[0006] An embodiment of the present invention provides a spintronic terahertz wave transmitter based on voltage-controlled magnetization to solve the problem of high energy consumption, low efficiency, and poor controllability when generating terahertz waves based on ultrafast spin dynamics in the prior art and other shortcomings, realize the emission of ultra-broadband terahertz pulsed radiation

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  • Spinning electron terahertz wave emitter based on voltage-controlled magnetization
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  • Spinning electron terahertz wave emitter based on voltage-controlled magnetization

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Embodiment Construction

[0016] 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.

[0017] In the prior art, when terahertz waves are generated through ultrafast spin dynamics, femtosecond laser pulses are used to irradiate the surface of ferromagnetic / nonmagnetic heterogeneous multilayer films, and the electrons in the ferromagnetic layer absorb light energy and transition to a value higher than the Fe The state of the meter ene...

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Abstract

The embodiment of the invention provides a spinning electron terahertz wave emitter based on voltage-controlled magnetization. Based on a reverse spinning Hall effect, a pumping laser irradiates a multilayer film structure including an electrode film layer, an insulating film layer, a ferromagnetic film layer, and a non-ferromagnetic film layer to generate a broadband terahertz pulse. Based on a Rashba effect and a spining orbital theory, an in-plane out-of-plane magnetization ratio is changed by applying a controllable voltage to achieve a purpose of changing the output terahertz. The material forming the multilayer film structure is relatively low in cost, and the ferromagnetic film layer can be prepared on a large scale. Unlike the existing nonlinear crystal and photoconductive antenna,the antenna is greatly reduced in cost. The ferromagnetic film layer has perpendicular magnetic anisotropy, and thus achieves magnetization in unit area much higher than the in-plane magnetization.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of terahertz pulse generation, and in particular to a spintronic terahertz wave transmitter based on voltage-controlled magnetization. Background technique [0002] Terahertz (Terahertz, THz) is a band between the far infrared and millimeter waves on the electromagnetic spectrum, with a frequency between 0.1-10THz. Terahertz waves in this frequency band have strong transmittance, safety and spectral resolution capabilities, and have broad application prospects in the fields of biological identification, safety monitoring, and communication remote sensing. [0003] The current relatively mature terahertz preparation and detection methods are mainly based on optoelectronics, such as the terahertz emission source based on the photorectification effect of zinc telluride (ZnTe) and the photoconductive antenna based on low-temperature-grown gallium arsenide (LT-GaAs) Terahertz technology for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S1/02
Inventor 聂天晓吴晓君李晓辉查单
Owner BEIHANG UNIV
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