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A polarization-tunable terahertz wave radiation source

A hertz wave and radiation source technology, which is applied in the field of polarization tunable terahertz wave radiation source, can solve the problems of increasing power and little help in information and communication engineering, and achieves stable and reliable performance and material saving. Effect

Active Publication Date: 2020-08-18
BEIHANG UNIV
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  • Application Information

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Problems solved by technology

This scheme is very flexible, and the generated terahertz radiation source can satisfy the research of condensed matter physics and biochiral molecules, but it is difficult to continue to increase the power, and it is not very helpful for the application to the information and communication engineering industry

Method used

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  • A polarization-tunable terahertz wave radiation source
  • A polarization-tunable terahertz wave radiation source

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Embodiment Construction

[0025] like figure 1 As shown, the present invention is based on the principle of spin emission, using the method of cascade emission, using a beam of femtosecond laser to pump two-stage nano-ferromagnetic thin films successively, and using the generated two-stage terahertz waves to realize arbitrary polarization state terahertz waves In order to realize the generation of circularly polarized terahertz waves, three conditions need to be met: the polarization states of the two terahertz waves must be perpendicular to each other, the amplitudes of the two terahertz waves must be equal, and there must be a gap between the two terahertz waves. 90° phase difference, thus finally realizing the generation of circularly polarized terahertz radiation source and the tuning of arbitrary polarization state.

[0026] The present invention will be further described below in conjunction with the accompanying drawings and examples. It should be understood that the following examples are inten...

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Abstract

The invention discloses a polarization-tunable terahertz wave radiation source, which comprises a metal closed cavity, a first-stage spin emitter, a second-stage spin emitter and a phase compensationand adjusting device, wherein the first-stage spin emitter, the second-stage spin emitter and the phase compensation and adjusting device are arranged in the metal closed cavity. Femtosecond laser isincident to the first-stage spin emitter, and first-stage terahertz waves are generated through pumping; remaining femtosecond laser continues to pump the second-stage spin emitter to generate second-stage terahertz waves; by adjusting the phase compensation and adjusting device, phase difference of the two stages of terahertz waves is 90 degrees; by adjusting two stages of external magnetic fields, the polarization states of the two stages of terahertz waves are perpendicular to each other; and by modulating the power of the the femtosecond pump laser, the amplitudes of the two stages of terahertz waves can be the same. According to the invention, high-quality circular polarization terahertz radiation can be generated, and generation of terahertz waves in any polarization state can be realized, which lays a foundation for a next generation of integrated novel terahertz radiation source.

Description

technical field [0001] The invention belongs to the technical field of terahertz wave generation, and in particular relates to a small, compact, high-efficiency polarization-tunable terahertz wave radiation source whose polarization can be adjusted arbitrarily. Background technique [0002] The terahertz band is in the transition frequency band between low-energy electronics and high-energy photonics. This is the last electromagnetic wave band that is understood and recognized by humans, and it is also currently recognized as an electromagnetic wave band with excellent characteristics. The generation, transmission, regulation and detection of terahertz radiation constitute the key technology of the emerging science of terahertz. People's research on the polarization state of terahertz waves is widely used in many fields such as high-speed broadband communication, national defense security, medical diagnosis, and new material research and development. It has important applica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S1/02
CPCH01S1/02
Inventor 吴晓君聂天晓陈薪厚郭丰玮杨培棣高扬
Owner BEIHANG UNIV