Efficient terahertz artificial surface plasmon directional coupler and coupling method

An artificial surface plasmon, directional coupler technology, applied in electrical components, waveguide devices, circuits, etc., can solve the problems of uncontrollable coupling direction, low efficiency, narrow frequency band, etc.

Active Publication Date: 2019-06-18
PEKING UNIV
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  • Description
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  • Application Information

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Problems solved by technology

However, these methods are faced with the disadvantages of uncontrollable coupling direction, low efficiency, narrow frequency band and large size, which will cause many problems in practical applications.

Method used

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  • Efficient terahertz artificial surface plasmon directional coupler and coupling method
  • Efficient terahertz artificial surface plasmon directional coupler and coupling method
  • Efficient terahertz artificial surface plasmon directional coupler and coupling method

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Embodiment Construction

[0035] The present invention will be further elaborated below through specific embodiments in conjunction with the accompanying drawings.

[0036] Such as figure 1 As shown, the high-efficiency terahertz artificial surface plasmon directional coupler of this embodiment includes: a metal cylindrical periodic array and an SSP waveguide; wherein, the SSP waveguide adopts a metal grating, and the metal grating has periodic grooves, and the period is a sub-wavelength period , that is, the period of the metal grating is smaller than the working wavelength of the incident terahertz wave, the period of the metal grating is p, the depth of the groove is h, and the width of the groove is d; a metal cylinder periodic array is set on the metal grating, and the metal cylinder periodic array It includes a plurality of metal cylinders periodically arranged parallel to each other. The plane of the axes of the metal cylinders is parallel to the surface of the metal grating, and the axis of the...

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Abstract

The invention discloses an efficient terahertz artificial surface plasmon directional coupler and a coupling method. A metal cylindrical periodic array is coupled with an SSP waveguide, the terahertzwave transmitting the metal cylindrical periodic array generates a spectral folding effect, and abundant space harmonic waves are generated; when the tangential wave loss of the n-order space harmonicwave meets an SSP wave mismatching condition, an SSP mode is coupled on the surface of the SSP waveguide; through reasonable design of parameters, the conversion efficiency from a free space beam tothe SSP mode is improved, the coupling direction and the working frequency band of the plasmon can be freely regulated and controlled, and a powerful promotion effect on practical application of the SSP mode in the terahertz wave band is achieved; due to the fact that the coupler is of a full-metal structure, the loss of the coupler can be reduced; and meanwhile, the coupler is of a periodic cylindrical structure, and compared with a traditional coupler, the coupler is simple in structure and easy to process, low in cost and high in integration level, and can be widely applied to a terahertz communication system and an imaging system.

Description

technical field [0001] The invention relates to the field of terahertz passive devices, in particular to a high-efficiency terahertz artificial surface plasmon directional coupler and a coupling method. Background technique [0002] The terahertz frequency band (0.1THz~10THz) is between the millimeter wave and the far infrared, and has extremely rich spectrum resources. Terahertz waves have many advantages such as penetrability, non-destructiveness, fingerprint spectrum characteristics, high-resolution characteristics and transient properties, and have important application prospects in many fields such as biomedicine, security inspection, nondestructive testing, sensor detection and communication. In recent years, terahertz science and technology has been set as one of the most important scientific research directions by many countries and regions. Research on the transmission, radiation and manipulation of terahertz waves is crucial to the development of terahertz science...

Claims

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Application Information

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IPC IPC(8): H01P5/18
Inventor 黄铁军刘江雨殷立征刘濮鲲
Owner PEKING UNIV
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