Method of guiding terahertz wave non-diffractive transmission based on plasma column array

A transmission method and plasma technology, which is applied in the field of diffraction-free transmission of terahertz waves guided by plasma column arrays, can solve the problems of short terahertz wave transmission distance and prolong the transmission distance of terahertz waves, and achieve long guidance distance and high degree of freedom high effect

Inactive Publication Date: 2019-08-16
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

[0004] The present invention aims at the problems of divergence caused by the diffraction transmission of terahertz waves in free space and the short propagation distance of terahertz waves. Wave energy loss, extending the transmission distance of terahertz waves

Method used

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  • Method of guiding terahertz wave non-diffractive transmission based on plasma column array
  • Method of guiding terahertz wave non-diffractive transmission based on plasma column array
  • Method of guiding terahertz wave non-diffractive transmission based on plasma column array

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Embodiment 1

[0028] like figure 1 As shown, the terahertz wave 2 radiated by the terahertz point source 1 in free space is transmitted with strong diffraction and divergence, with large transmission loss and short transmission distance.

[0029] like figure 2 As shown, adopt femtosecond laser source 3 in the present invention, its center wavelength is 800nm, pulse width is about 50fs, repetition frequency is 1kHz, and femtosecond laser is divided into two beams of equal power laser beams after beam splitter 5 earlier, These two laser beams pass through the mirror 4, the beam splitter 7, the mirror 6, the beam splitter 8, and the mirror 9 respectively to form four laser beams of equal power, and two of the laser beams pass through the beam splitter respectively 10. After the reflector 11, the beam splitter 13 and the reflector 12, four laser beams of equal power are formed. These six equal-power laser beams (beams 1, 2, 3, 4, 5, 6) are respectively focused by plano-convex lenses with a f...

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Abstract

The invention relates to a method of guiding terahertz wave non-diffractive transmission based on a plasma column array. The method comprises steps of: first, setting up a terahertz point source in afree space, where generated terahertz wave strongly diffracts in transmission and has a large divergence angle; then, setting up a femtosecond laser source in the free space, emitting incidental femtosecond laser, allowing the incidental femtosecond laser to pass multiple beam splitters so as to be split into multiple laser pulses of equal power; finally, focusing the multiple laser pulses of equal power by a plano-convex lens in air, so as to generate plasma column arrays distributed around the terahertz point source circularly. Space photonic crystal waveguide formed by the arrays constrainsthe terahertz wave signal to transmit in the center of the circle, so that strong diffractive diffusion of the terahertz wave in the free space is prevented, energy loss is reduced, and the transmission distance of the terahertz wave signal is elongated remarkably. The method can be used in terahertz remote sensing.

Description

technical field [0001] The invention relates to a method for guiding terahertz wave transmission, in particular to a method for guiding terahertz wave transmission without diffraction by using a plasma column array. Background technique [0002] In recent decades, terahertz waves have become an important research topic in the field of physics because of their wide application prospects. Terahertz radiation is an electromagnetic wave with a frequency in the range of 0.1 to 10 THz. This band is located between microwave and infrared. It has the characteristics of rich information, high spatio-temporal coherence, and low photon energy. Huge application value. At present, the main applied research includes terahertz time-domain spectroscopy technology, terahertz imaging technology, terahertz security inspection, terahertz radar, terahertz communication technology, etc. [0003] However, since the wavelength of terahertz wave is longer than that of infrared and visible light, t...

Claims

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Application Information

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IPC IPC(8): G02B27/09G02B27/10
CPCG02B27/0927G02B27/0955G02B27/106
Inventor 赵佳宇汤烈志彭滟朱亦鸣刘昶陈亚敏
Owner UNIV OF SHANGHAI FOR SCI & TECH
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