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Terahertz wave filter

A filter and terahertz technology, which is applied in the field of terahertz wave filters, can solve problems such as the inability to realize the tuning of the transmission frequency and the inability to realize the control work

Inactive Publication Date: 2014-09-24
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Once the filter is made, the frequency range of the filtered terahertz wave remains unchanged, and the regulation of a certain frequency band cannot be realized.
The invention patent "An ultra-thin multi-channel terahertz filter with temperature control" (patent number: CN101504997A) also discloses a terahertz wave filter, which can only achieve the transmission intensity of terahertz waves by adjusting the temperature The change of the transmission frequency can not be achieved

Method used

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Embodiment 1

[0027] figure 1 It is a structural schematic diagram of the terahertz wave filter involved in the present invention in an embodiment.

[0028] like figure 1 As shown, the terahertz wave filter 10 has a base layer 1 , a sub-wavelength metal grating layer 2 , and a temperature control device (not shown in the figure), and the sub-wavelength metal grating layer 2 includes metal grid bars 3 and dielectric grid bars 4 .

[0029] The metal grid strips 3 are made of copper, and the dielectric grid strips 4 are made of air. The metal grid strips 3 and the dielectric grid strips 4 are alternately arranged periodically. The subwavelength metal grating layer 2 has a grating period of 20 μm, a duty ratio of 4:1, and a grating groove depth of 500 nm. The frequency range of the incident terahertz wave is 0.3-3 THz, and the corresponding wavelength range is 100 μm to 1000 μm, and the grating period of the sub-wavelength metal grating layer is smaller than the wavelength of the incident wa...

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Abstract

The invention discloses a Terahertz wave filter, which can be used for absorbing waves in specific frequency bands in Terahertz incident waves to realize filtering. The Terahertz wave filter is characterized by comprising a sub-wavelength metal grating layer of which the grating period is shorter than the incident wave length, a substrate layer which is carried below the sub-wavelength metal grating layer, and a temperature control device which is connected with the substrate layer and is used for controlling the temperature of the substrate layer, wherein the sub-wavelength metal grating layer comprises a metal grid bar and a medium grid bar. The Terahertz incident waves of specific frequencies undergo localized surface plasma resonance on the sub-wavelength metal grating layer, and Terahertz incident waves in frequency bands close to the resonant frequency are absorbed. When the temperature of the substrate layer is changed by the temperature control device, the resonant frequency is changed, and the frequency band of the absorbed waves is changed. By adopting the Terahertz wave filter, tunable filtering is realized.

Description

technical field [0001] The invention relates to a terahertz wave filter, belonging to the technical field of terahertz waves. Background technique [0002] Terahertz wave has unique characteristics such as coherence, transient, broadband, low photon energy and harmless to human body. Terahertz wave filter is an important terahertz device, which has important applications in imaging, communication, radar systems, etc. [0003] The traditional filter design method in the optical band is difficult to achieve in the terahertz band, and the use of localized surface plasmon resonance technology can well design functional devices in the terahertz band. The invention patent "An EMXT cavity filter in THz band based on MEMS technology" (patent number: CN103107394A) discloses a structure of a terahertz wave filter. Once the filter is made, the frequency range of the filtered terahertz wave remains unchanged, and the control work of a certain frequency band cannot be realized. The in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/01
Inventor 唐庆勇王琦王建宇张大伟钱林勇黄元申
Owner UNIV OF SHANGHAI FOR SCI & TECH
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