Dual-band terahertz wave generation device and method

A terahertz, dual-band technology, applied in the field of terahertz waves, can solve the problems of single periodic metal structure, low conversion efficiency, narrow bandwidth, etc., and achieve the effects of low energy, high excitation efficiency, and strong near-field coupling

Active Publication Date: 2021-12-31
BEIJING INST OF ENVIRONMENTAL FEATURES
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Problems solved by technology

[0005] However, the conversion efficiency of the above-mentioned terahertz generating device through infrared laser injection is low, and the electron beam threshold required to generate terahertz radiation through the free laser excited by the electron beam is relatively large, and the periodic metal structure adopted is a single The depth of surface plasmons can only work in a single frequency band, so the generated terahertz radiation also works in a single frequency band, and the bandwidth is relatively narrow

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  • Dual-band terahertz wave generation device and method
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  • Dual-band terahertz wave generation device and method

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[0048] 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 the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection of the present invention. scope.

[0049]In the prior art, in order to overcome the shortcomings of the current optical source or electronic source to generate surface plasmons in the terahertz frequency band, the energy of the excitation source is relatively large, the conversion efficiency is low, or the working bandwidth is narrow and the single mode works. The present invention propos...

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Abstract

The invention relates to a dual-band terahertz wave generation device and method. The device comprises an emission cathode, a collector and a metal grating, wherein the emission cathode and the collector are arranged above the metal grating, the emission cathode can emit electron beams, and the collector can receive the electron beams; one side, close to the emission cathode and the collector, of the metal grating is provided with N first rectangular grooves and N second rectangular grooves, the depths of the first rectangular grooves and the depths of the second rectangular grooves are different, and the first rectangular grooves and the second rectangular grooves are periodically arranged on the metal grating. When the working voltage of the electron beam is greater than the maximum cut-off working voltage in the metal grating, dual-band surface plasmons can be excited, so that terahertz waves are generated by utilizing the interaction of the electron beam and the surface plasmons. The scheme provided by the invention can realize high-efficiency excitation of dual-band terahertz waves, and also has the advantage of wide-band working.

Description

technical field [0001] The present invention relates to the technical field of terahertz waves, in particular to a dual-band terahertz wave generating device and method. Background technique [0002] Surface plasmon polaritons (SPP) is a special optical mode that exists on the interface between metal and medium, but as the frequency moves down to the terahertz and microwave bands, due to the ideal conductor-like properties of metals, Surface plasmons become poorly localized on homogeneous metal surfaces. By periodically slotting or punching holes on the metal surface, the local adhesion of surface plasmons becomes stronger, and its equivalent asymptotic frequency can be adjusted arbitrarily through periodic structural parameters, so it is also called artificial surface, etc. excitons. [0003] In recent years, artificial surface plasmons with periodic metal structures have been used in terahertz integrated waveguides, couplers, and power splitters due to their excellent el...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S1/02
CPCH01S1/02
Inventor 刘永强孙金海李粮生殷红成
Owner BEIJING INST OF ENVIRONMENTAL FEATURES
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