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A broadband terahertz reflector with composite periodic waveguide structure

A waveguide structure and composite period technology, applied in the field of broadband terahertz reflectors, can solve the problems of complex manufacturing process, high manufacturing cost, wide reflection bandwidth, etc., and achieve the effects of small size, simple operation and low cost

Active Publication Date: 2018-12-07
HARBIN ENG UNIV
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  • Description
  • Claims
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Problems solved by technology

Compared with the periodic composite waveguide reflector, the terahertz reflector with the above structure has complex manufacturing process, relatively high manufacturing cost, and cannot have a wide reflection bandwidth and high reflectivity at the same time

Method used

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  • A broadband terahertz reflector with composite periodic waveguide structure
  • A broadband terahertz reflector with composite periodic waveguide structure
  • A broadband terahertz reflector with composite periodic waveguide structure

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] The invention provides a broadband terahertz reflector with a compound periodic waveguide structure. It is composed of two cylindrical hollow waveguides with a periodic structure (waveguide a and waveguide b, the undulation height of the periodic waveguide wall of waveguide a ε a =0.1r a0 (r a0 is the average radius of the waveguide a), so the short and long radii are r a1 and r a2 , the period length is Λ a , the number of cycles is N a ; Undulation height ε of periodic waveguide wall of waveguide b b =0.1r b0 (r b0 is the average radius of the waveguide b), so the short and long radii are r b1 and r b2 , the period length is Λ b , the number of cycles is N b ), the waveguide wall material is low-loss metal. The structural parameters of the two waveguides are given by the Bragg resonance and non-Bragg resonance conditions of the periodically variab...

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Abstract

The invention belongs to the waveguide type terahertz functional device technical field and relates to a wide-band terahertz reflector of a composite periodic wave guide structure. Two periodic cylindrical hollow waveguides with different structure parameters, namely, a waveguide a and a waveguide b are connected together so as to form the wide-band terahertz reflector; the cylindrical hollow waveguides have Prague forbidden bands and non-Prague forbidden bands in terahertz bands, and the Prague forbidden bands and the non-Prague forbidden bands are arranged alternately. The wide-band terahertz reflector of the invention has the advantages of simple structure, small size, convenient operation and low cost. The wide-band terahertz reflector has no requirements for directions and can be used in a bidirectional manner with the reflection band and reflectivity of the reflector rarely varied, and the wide reflection band of the reflector ranges from 0.76 to 1.46THz, and the highest reflectivity of the reflector can reach 99.9%; the reflection band and reflectivity can be controlled and changed through adjusting the structure parameters of the two periodic structure waveguides; and the reflector is of a completely closed metal structure, and therefore, electromagnetic radiation and dielectric loss can be avoided, and packaging problems are not required to be considered.

Description

technical field [0001] The invention belongs to the technical field of waveguide-type terahertz functional devices, and specifically relates to a broadband terahertz reflector with a compound periodic waveguide structure. Background technique [0002] Because terahertz waves have the advantages of transient, coherent, wide-band, low photon energy, etc., they are widely used in the fields of material identification, information communication, imaging, medical diagnosis, space detection, security inspection, space astronomy and even military affairs. Applications. However, the actual application of the terahertz system depends on terahertz functional devices, and the related terahertz functional devices include conduction, beam splitting, filtering and other devices. Especially in terahertz time-domain spectroscopy system and terahertz communication system, there is an urgent need for terahertz reflectors with low loss, low cost, simple structure and broadband. [0003] At p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/00G02B5/08
CPCG02B5/08G02B6/00
Inventor 陶智勇张鹭赵秋玉刘欢徐兰兰樊亚仙
Owner HARBIN ENG UNIV
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