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Local classification deep material grating super slow terahertz modulating method and waveguide

A modulation method, terahertz technology, applied in the field of ultra-slow terahertz waveguides, can solve problems such as low speed of terahertz waves, and achieve the effect of accurate and controllable results and simple structure

Inactive Publication Date: 2013-11-27
TIANJIN UNIV
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Problems solved by technology

[0005] In order to overcome the deficiencies of the prior art, the present invention aims to solve the problem of low-speed transmission of terahertz waves, and provides a terahertz ultra-slow waveguide based on a hierarchical depth metal or semiconductor grating structure. The relationship between waveguide parameters and transmission rates is determined by appropriate The theoretical approach was determined

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  • Local classification deep material grating super slow terahertz modulating method and waveguide
  • Local classification deep material grating super slow terahertz modulating method and waveguide
  • Local classification deep material grating super slow terahertz modulating method and waveguide

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Embodiment 1

[0033] like figure 1 The schematic diagram of the local graded depth metal grating structure is shown. The grating is made of metal or semiconductor, and the surface of the waveguide composed of metal or semiconductor material is periodically written with grooves. It consists of two parts. 2 is the part where the groove depth is fixed.

[0034] Metal or heavily doped semiconductor structures based on surface plasmons in the terahertz band can be regarded as perfect conductors, and the dispersion relation of electromagnetic waves with TM polarization (Ex, Ez, Hy) transmitted in the x direction can be expressed by the following formula:

[0035] k = ω c 1 + w 2 p 2 tan ( ω c d ...

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Abstract

The invention relates to the field of metal or semiconductor grating and waveguides, aims at solving the problem that terahertz is transmitted at a low speed, and provides a super low terahertz waveguide. The relationship between the waveguide parameters and the transmission speed rate is confirmed through a proper theoretical method. According to the technical scheme of the super low terahertz waveguide of a local classification deep material grating super slow terahertz waveguide, a groove in a periodic format is etched on the surface of local classification deep materials, one part of the groove depth is fixed and unchanged, the other part of the groove depth changes in a classified mode, detailedly, the initial broadcasting period of the front section terahertz is a gradual-changing depth so as to reduce the speed of the terahertz broadcasting along the surface of grating, if the depth keeps changing gradually, the broadcasting speed of the terahertz can finally be reduced to zero so as to enable the terahertz to stop on the surface of the grating with gradually-changing depth, and the depth of the back half section groove is fixed and unchanged so as to enable the terahertz to broadcast at a certain speed. The waveguide is mainly used for low-speed transmission of terahertz.

Description

technical field [0001] The invention relates to the technical field of metal or semiconductor gratings and waveguides, in particular to an ultra-slow terahertz waveguide based on locally graded deep metal or semiconductor gratings. technical background [0002] Terahertz waves refer to electromagnetic waves with a frequency between 0.1THz and 10THz and a wavelength between 0.03mm-3mm. Its special position makes terahertz technology a bridge connecting electronics and photonics, and it is precisely controlled through linear waveguides The transmission speed of Hertzian waves has always been a major research topic in the field of optics. Reducing and controlling the speed of terahertz waves is of great significance for the research of terahertz band optical modulators, sensors, nonlinear enhancement and other technologies. It has broad application prospects in field imaging and biosensing. [0003] Surface plasmon polaritons (SPPs) have been proven to confine and control the ...

Claims

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Application Information

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IPC IPC(8): H01P3/00H01Q15/00G02B6/124
Inventor 史伟郭宝山姚建铨
Owner TIANJIN UNIV
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