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WO2018205762A1 - Diviseur de faisceau térahertz - Google Patents

Diviseur de faisceau térahertz Download PDF

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Publication number
WO2018205762A1
WO2018205762A1 PCT/CN2018/080783 CN2018080783W WO2018205762A1 WO 2018205762 A1 WO2018205762 A1 WO 2018205762A1 CN 2018080783 W CN2018080783 W CN 2018080783W WO 2018205762 A1 WO2018205762 A1 WO 2018205762A1
Authority
WO
WIPO (PCT)
Prior art keywords
terahertz
beam splitter
wave
coupling end
splitting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2018/080783
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English (en)
Chinese (zh)
Inventor
郑渚
杨彬
丁庆
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Institute of Terahertz Technology and Innovation
Original Assignee
Shenzhen Institute of Terahertz Technology and Innovation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Institute of Terahertz Technology and Innovation filed Critical Shenzhen Institute of Terahertz Technology and Innovation
Publication of WO2018205762A1 publication Critical patent/WO2018205762A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B6/122—Basic optical elements, e.g. light-guiding paths
    • G02B6/125—Bends, branchings or intersections

Definitions

  • the present invention relates to the field of electromagnetic wave splitting, and more particularly to a terahertz beam splitter.
  • Electromagnetic waves in the terahertz band are more and more widely used due to their own advantages, but limited by the lack of large bandwidth, low loss, low dispersion waveguide structure in the terahertz band, and a large number of terahertz applications are limited to free space optical paths, how to Implementing an integrated terahertz application is a major issue. Among them, the realization of the terahertz wave splitting is the basis of many applications.
  • the beam splitter that relies on waveguide transmission in the terahertz frequency band has the disadvantages of high loss and large dispersion, and cannot enjoy the advantages brought by the large bandwidth of the terahertz spectrum.
  • a terahertz beam splitter is a Sommerfeld wave waveguide of a Y-shaped structure, and the three ends of the Y-shaped structure are respectively:
  • Terahertz coupling end for coupling and conducting terahertz incident waves
  • Two terahertz splitting arms two branches branched from the terahertz coupling end, are used to split the terahertz incident wave into two terahertz outgoing waves and conduct them out.
  • the terahertz beam splitter is a Sommerfeld wave waveguide of a Y-shaped structure, and the three ends of the Y-shaped structure are a terahertz coupling end and two terahertz splitting arms, respectively, and the terahertz coupling end is used for coupling and conducting the terahertz An incident wave, two terahertz splitting arms are two branches branched from the terahertz coupling end, configured to split the terahertz incident wave into two terahertz outgoing waves and conduct them out;
  • the Hertz beam splitter utilizes the surface plasmon mode of the Sommerfeld wave waveguide, so that the terahertz wave propagates on the surface of the Sommerfeld wave waveguide, and the terahertz wave splitting is realized by two branches of the Y-shaped structure; the terahertz
  • the beam splitter has a simple structure and has the advantages of large bandwidth, low loss, and low dispersion.
  • the Sommerfeld wave waveguide is a bare metal wire terahertz wave waveguide.
  • the terahertz incident wave is a radially polarized terahertz traveling wave transmitted along the terahertz coupling end.
  • the junction of each of the terahertz beam splitting arms and the terahertz coupling ends forms an arc.
  • the greater the radius of curvature of the arc the less the loss of the terahertz splitting arm bend due to bending leakage.
  • the Sommerfeld wave waveguide has a bandwidth of 0.1 THz to 5 THz.
  • the terahertz coupling end and the two terahertz splitting arms are both cylindrical bare metal wires.
  • the bare metal wire is made of gold or silver or copper.
  • the bare metal wire is made of stainless steel.
  • FIG. 1 is a schematic perspective view of a terahertz beam splitter in an embodiment
  • FIG. 2 is a diagram showing the effect of the power division of the terahertz beam splitter in an embodiment
  • Figure 3 is a plan view of a terahertz beam splitter in an embodiment
  • Figure 4 is a graph showing the power efficiency of a terahertz beam splitter in an embodiment.
  • FIG. 1 is a schematic perspective view of a terahertz beam splitter in an embodiment.
  • the terahertz beam splitter is a Sommerfeld wave waveguide of a Y-shaped structure, and the three ends of the Y-shaped structure are a terahertz coupling end 10 and two terahertz splitting arms 11, 12, respectively.
  • the Sommerfeld wave waveguide When the Sommerfeld wave waveguide is used to conduct electromagnetic waves in the terahertz band, it operates in a surface plasma mode where terahertz waves propagate on its surface. Further, the Sommerfeld wave waveguide is a bare metal wire terahertz wave waveguide, which can realize surface propagation of a terahertz wave, and has a simple structure, which can transmit a large bandwidth terahertz wave, and the specific Sommerfeld wave waveguide The bandwidth is from 0.1 THz to 5 THz, and the terahertz wave has low loss and low dispersion during propagation through the waveguide.
  • the terahertz coupling end 10 is used to couple and conduct terahertz incident waves.
  • the terahertz incident wave enters the Sommerfeld wave waveguide from the terahertz coupling end 10. Further, in order to efficiently couple the terahertz incident wave to the Sommerfeld wave waveguide, the terahertz incident wave adopts a radial polarization (TM01 mode) terahertz traveling wave transmitted along the terahertz coupling end 10.
  • TM01 mode radial polarization
  • the two terahertz splitting arms 11, 12 are two branches branched from the terahertz coupling end 10 for splitting the terahertz incident wave into two terahertz outgoing waves and conducting them out.
  • the two terahertz splitting arms 11, 12 and the terahertz coupling end 10 form a Y-shaped structure, wherein the two terahertz splitting arms 11, 12 are two branches of the Y-shaped structure, and the terahertz incident wave is coupled into the After the Hertz coupling end 10, the two terahertz splitting arms 11, 12 of the same structure are further propagated to effect splitting.
  • Fig. 2 is a diagram showing the effect of the power division of the terahertz beam splitter in an embodiment.
  • the terahertz incident wave enters the terahertz beam splitter from the terahertz coupling end 10, and splits along the surface of the terahertz coupling end 10 to the two terahertz splitting arms 11, 12 to form a splitting beam to form two field strengths.
  • the weak terahertz exits the wave and continues to propagate along the surface of the terahertz beam splitting arms 11, 12.
  • the terahertz beam splitter has a simple structure and has the advantages of large bandwidth, low loss, and low dispersion.
  • Figure 3 is a top plan view of a terahertz beam splitter in an embodiment.
  • An arc is formed at the junction of each of the terahertz beam splitting arms 11, 12 and the terahertz coupling end 10. Further, the larger the radius of curvature of the arc, the smaller the loss caused by the bending leakage of the terahertz beam splitting arm.
  • the loss of the splitting mainly comes from two aspects: one is the loss due to the mode mismatch and reflection at the bifurcation of the Y-shaped structure; the other is the bending of the metal wire.
  • the resulting terahertz wave leaked.
  • the bifurcation is the junction of the terahertz splitter arms 11, 12 and the terahertz coupling end 10.
  • the length of the arc at the joint is a fixed value of 50 mm, and the radius of the arc corresponding to the fixed arc length varies from 50 mm to 150 mm.
  • the field strength relationship of the incident wave It can be seen that the radius of the arc is gradually increased, that is, the radius of curvature. When the radius R of the arc is greater than 120 mm, the loss caused by the bending leakage of the terahertz splitting arms 11 and 12 is substantially suppressed, and the single terahertz splitting arm is at this time.
  • the terahertz coupling end 10 and the two terahertz splitting arms 11, 12 are both cylindrical bare metal wires.
  • the bare metal wire may be made of gold, silver, copper or stainless steel having high electrical conductivity. It can be selected according to the actual application requirements, and a terahertz beam splitter with simple structure, low cost and low loss is obtained.
  • the above terahertz beam splitter can be obtained by a machining method or a 3D printing technique.
  • the terahertz beam splitter adopts a Y-shaped structure of a Sommerfeld wave waveguide, and the three ends of the Y-shaped structure are a terahertz coupling end and two terahertz splitting arms respectively, and a surface plasmon mode using a Sommerfeld wave waveguide So that the terahertz wave propagates on the surface of the Sommerfeld wave waveguide, the terahertz incident wave enters the beam splitter through the terahertz coupling end 10, and the two terahertz splitting arms 11 corresponding to the two branches passing through the Y-shaped structure 12, to achieve splitting, in order to suppress the loss caused by the Y-shaped structure itself, a special arc design is carried out on the bifurcation, which further reduces the loss of the beam splitter and improves its energy utilization.
  • the terahertz beam splitter has a simple structure and has the advantages of large bandwidth, low loss, and low dispersion.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
  • Optical Integrated Circuits (AREA)

Abstract

L'invention concerne un diviseur de faisceau térahertz, qui est un guide d'ondes Sommerfeld ayant une structure en forme de Y. Trois extrémités de la structure en forme de Y sont respectivement une extrémité de couplage térahertz (10) et deux bras de division de faisceau térahertz (11 et 12). L'extrémité de couplage térahertz (10) est utilisée pour coupler et transmettre une onde térahertz incidente. Les deux bras de division de faisceau térahertz (11 et 12) sont deux branches se ramifiant à partir de l'extrémité de couplage térahertz (10) et sont utilisées pour diviser l'onde térahertz incidente pour former deux ondes térahertz émergentes et les transmettre. L'onde térahertz est transmise sur la surface du guide d'ondes Sommerfeld en utilisant un mode plasma de surface du guide d'ondes Sommerfeld, et la division de faisceau de l'onde térahertz est réalisée au moyen des deux branches de la structure en forme de Y. Le diviseur de faisceau térahertz a une structure simple et présente les avantages d'une grande largeur de bande, d'une faible perte et d'une faible dispersion chromatique.
PCT/CN2018/080783 2017-05-12 2018-03-28 Diviseur de faisceau térahertz Ceased WO2018205762A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201710335964.5A CN107065069A (zh) 2017-05-12 2017-05-12 太赫兹分束器
CN201710335964.5 2017-05-12

Publications (1)

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WO2018205762A1 true WO2018205762A1 (fr) 2018-11-15

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WO (1) WO2018205762A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107065069A (zh) * 2017-05-12 2017-08-18 深圳市太赫兹科技创新研究院 太赫兹分束器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006019776A2 (fr) * 2004-07-14 2006-02-23 William Marsh Rice University Procede de couplage d'impulsions terahertz dans un guide d'ondes coaxial
CN202661667U (zh) * 2012-06-25 2013-01-09 中国计量学院 Y字形一维光子晶体太赫兹波偏振分束器
CN103499855A (zh) * 2013-10-15 2014-01-08 北京航空航天大学 一种光子晶体光纤耦合器及其制备方法
CN107065069A (zh) * 2017-05-12 2017-08-18 深圳市太赫兹科技创新研究院 太赫兹分束器

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JPH0980361A (ja) * 1995-09-12 1997-03-28 Hitachi Ltd 光信号処理方法および装置
CN101750751B (zh) * 2010-01-22 2012-02-15 中国计量学院 太赫兹波偏振分束器
CN102156328B (zh) * 2011-04-11 2012-05-30 中国计量学院 Y形孔状镂空平板太赫兹波偏振分束器
CN102156327B (zh) * 2011-04-11 2012-07-04 中国计量学院 双谐振腔结构的太赫兹波偏振分束器
CN102290624B (zh) * 2011-05-11 2013-09-18 东南大学 多方向表面波分波器
CN102902016B (zh) * 2012-10-09 2013-12-25 中国计量学院 孔状结构的u形太赫兹波偏振分束器
CN102928926B (zh) * 2012-10-12 2013-11-20 中国计量学院 开槽分支型的太赫兹波偏振分束器
CN102928996B (zh) * 2012-10-12 2015-01-14 中国计量学院 电控太赫兹波偏振分束器
CN103457009B (zh) * 2013-08-16 2016-01-20 上海理工大学 太赫兹低损耗弯曲波导
CN104078732B (zh) * 2014-03-25 2016-08-17 浙江大学 一种太赫兹波传输的功分、合路结构

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006019776A2 (fr) * 2004-07-14 2006-02-23 William Marsh Rice University Procede de couplage d'impulsions terahertz dans un guide d'ondes coaxial
CN202661667U (zh) * 2012-06-25 2013-01-09 中国计量学院 Y字形一维光子晶体太赫兹波偏振分束器
CN103499855A (zh) * 2013-10-15 2014-01-08 北京航空航天大学 一种光子晶体光纤耦合器及其制备方法
CN107065069A (zh) * 2017-05-12 2017-08-18 深圳市太赫兹科技创新研究院 太赫兹分束器

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