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Four-channel terahertz wave signal selection switch based on magnetic photonic crystal

A technology of magneto-photonic crystals and photonic crystals, applied in the field of terahertz devices, can solve the problem of fewer switch ports and achieve the effects of easy integration, small size, and changing lattice constants

Inactive Publication Date: 2018-10-12
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the deficiencies in the prior art, the present invention provides a four-channel terahertz wave routing switch based on magneto-photonic crystals, which solves the problem of fewer switch ports

Method used

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  • Four-channel terahertz wave signal selection switch based on magnetic photonic crystal
  • Four-channel terahertz wave signal selection switch based on magnetic photonic crystal
  • Four-channel terahertz wave signal selection switch based on magnetic photonic crystal

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0033] When the magnitude of the applied external magnetic field is H ex1 =16.3γ -1 When , the magnetic permeability of the magnetic point defect material becomes μ 1 = 1.20. When the size of the point defect dielectric column is R 1 =0.31R, the magnetic point defect microcavity resonates with the incident wave, and the incident wave bends upward at 90 degrees at the microcavity of the output channel 2, and is output from the output channel 2. image 3 Shown is the steady-state field strength distribution when channel 2 is selected, Figure 4 Shown is the time-domain steady-state response when Channel 2 is selected. from image 3 It can be seen that most of the incident THz wave is output from the output channel 2, by Figure 4 It can be obtained that the transmittance is 98.35%, and only a small amount of THz waves are output from other output ports. So channel 2 is open and other channels are closed. When channel 2 is selected, the extinction ratio of the switch is 2...

example 2

[0035] When the magnitude of the applied external magnetic field is Hex2 =3.36γ -1 When , the magnetic permeability of the magnetic point defect material becomes μ 2 =2.42. When the size of the point defect dielectric column is R 2 =0.20R, the point defect microcavity resonates with the incident wave, and the incident wave bends downward at 90 degrees at the microcavity of the output channel 3, and is output from the output channel 3. Figure 5 Shown is the steady-state field strength distribution when channel 3 is selected, Image 6 Shown is the time-domain steady-state response when Channel 3 is selected. from Figure 5 It can be seen that most of the incident THz wave is output from the output channel 3, by Image 6 It can be obtained that the transmittance is 98.54%, and only a small amount of THz waves are output from other output ports. So channel 3 is open and other channels are closed. When channel 3 is selected, the extinction ratio of the switch is 14.20dB, an...

example 3

[0037] When the magnitude of the applied external magnetic field is H ex3 =4.98γ -1 When , the magnetic permeability of the magnetic point defect material becomes μ 3 = 1.81. When the size of the point defect dielectric column is R 3 =0.24R, the point defect microcavity resonates with the incident wave, and the incident wave bends upward at 90 degrees at the microcavity of the output channel 4, and is output from the output channel 4. Figure 7 Shown is the steady-state field strength distribution when channel 4 is selected, Figure 8 Shown is the time-domain steady-state response when Channel 4 is selected. from Figure 7 It can be seen that most of the incident THz wave is output from the output channel 4, by Figure 8 It can be obtained that the transmittance is 93.59%, and only a small amount of THz waves are output from other output terminals. So channel 4 is open and other channels are closed. When channel 4 is selected, the extinction ratio of the switch is 17.4...

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Abstract

The invention discloses a four-channel terahertz wave signal selection switch based on magnetic photonic crystal. An input waveguide is formed by horizontally removing part of dielectric cylinders inthe middle of a complete photonic crystal with TE mode band gap, and four output waveguides are formed by removing part of dielectric cylinders in the longitudinal direction of photonic crystals and symmetrically in the upper and lower ends of the input waveguide. An odd number of dielectric cylinders are retained between the four output waveguides and the input waveguide respectively. The centraldielectric cylinder of the retained odd number of dielectric cylinder is replaced with a magnetic point defect dielectric cylinder, and the magnetic point defect dielectric cylinder form a magnetic point defect micro-cavity with the surrounding medium cylinders. The input waveguide inputs a terahertz wave and controls the magnitude of the applied magnetic field applied to the selection switch. When the resonant frequency of a magnetic point defect micro-cavity is the same as the frequency of the incident terahertz wave, the incident wave can be coupled to the corresponding output waveguide for output. The switch has the advantages of fast speed, small volume and easy integration. And with four channels, the incident wave can be output from any one of the output channels.

Description

technical field [0001] The invention relates to the field of terahertz devices, in particular to a four-channel terahertz wave routing switch based on magneto-photonic crystals. Background technique [0002] Terahertz wave (THz wave) refers to a wave between microwave and infrared light, and its wavelength range is 30-3000 μm. Due to its special spectral position, good safety, high resolving power, and good transmittance, THz technology has been widely valued in the fields of object imaging, medical diagnosis, environmental monitoring, broadband mobile communication, radar, and astronomy. Compared with wireless communication, terahertz waves occupy more abundant spectrum resources, so the development of THz communication is particularly important. In recent years, there has been an upsurge in the study of terahertz communication systems and devices, among which THz wave switches are an indispensable part of THz technology applications and have become a research hotspot. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/09G02F1/00G02B1/00
CPCG02B1/005G02F1/0036G02F1/09
Inventor 李培丽张元方
Owner NANJING UNIV OF POSTS & TELECOMM
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