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Polarization-tunable terahertz radiation source based on spin emission and linearly polarized photocurrent

A technology of terahertz radiation source and linearly polarized light, which is applied to solid-state lasers and other directions, can solve the problems of complex regulation, instability, and low radiation efficiency of terahertz source devices, and achieve simple structure, firm and stable performance, and low material consumption. Effect

Active Publication Date: 2022-04-12
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the regulation of terahertz source devices based on topological insulators is extremely complex and unstable, and the radiation efficiency is also very low.

Method used

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  • Polarization-tunable terahertz radiation source based on spin emission and linearly polarized photocurrent
  • Polarization-tunable terahertz radiation source based on spin emission and linearly polarized photocurrent
  • Polarization-tunable terahertz radiation source based on spin emission and linearly polarized photocurrent

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Embodiment Construction

[0036] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0037] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Therefore, the protection scope of the present invention is not limited by the specific details disclosed below. EXAMPLE LIMITATIONS.

[0038] The invention utilizes the heterojunction thin film grown by the topological insulator thin film and the ferromagnetic metal thin film, utilizes the spin emission on the surface of the heterojun...

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Abstract

The invention discloses a polarization-tunable terahertz radiation source based on spin emission and linearly polarized photocurrent. Simultaneous excitation produces spin-charge conversion and linearly polarized photocurrent effects, and radiates linearly polarized photocurrent component terahertz waves and spin-charge conversion component terahertz waves respectively. The combination and regulation of the terahertz waves contributed by the two effects of spin charge conversion results in a high-quality circularly polarized terahertz wave radiation source. The invention can not only generate high-quality circularly polarized terahertz radiation, but also realize the generation of terahertz waves with any polarization state, which lays the foundation for the next generation of integrated new terahertz radiation sources.

Description

technical field [0001] The invention belongs to the technical field of terahertz wave generation, in particular to a polarization-tunable terahertz radiation source based on spin emission and linearly polarized photocurrent. Background technique [0002] Terahertz waves are electromagnetic waves with a frequency band between 0.1 and 30 THz, and their frequency range is between the upper edge of microwave and millimeter waves and the lower edge of far-infrared, because traditional electronic means and classical photonics means are difficult to handle well The electromagnetic wave of this frequency band is processed in a very good way, which also makes it the last electromagnetic wave band that is understood and recognized by human beings. Terahertz wave, as a recognized electromagnetic wave band with excellent characteristics, has many advantages such as penetrability, low energy, broadband, and uniqueness, and has a wide range of applications in the fields of wireless commun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S1/02
CPCH01S1/02
Inventor 吴晓君陈薪厚
Owner BEIHANG UNIV