Broadband low-loss terahertz far field super lens and imaging method thereof

A low-loss, terahertz technology, applied in the field of terahertz far-field super-resolution imaging, can solve the problems of large loss and low frequency band of far-field super-lenses, and achieve the effects of easy processing, broadband imaging, and reduced transmission loss

Active Publication Date: 2017-07-14
PEKING UNIV
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Problems solved by technology

[0005] Aiming at the problems of low frequency band and high loss of existing far-field metalens, the present invention provides a broadband low-loss terahertz far-field metalens and its imaging method

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  • Broadband low-loss terahertz far field super lens and imaging method thereof
  • Broadband low-loss terahertz far field super lens and imaging method thereof
  • Broadband low-loss terahertz far field super lens and imaging method thereof

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Embodiment Construction

[0031] The present invention will be further elaborated below through specific embodiments in conjunction with the accompanying drawings.

[0032] Such as figure 1 As shown, the broadband low-loss terahertz far-field metalens of this embodiment includes: a dielectric substrate and a transmission metal grating with angular periodic distribution on it; wherein, the horizontal shape of the dielectric substrate and the transmission metal grating are the same, both A sector of 180 degrees; the inner radius of the sector is r 1 , the inner radius surface is the object plane of the lens, and the outer radius is r 2 , the outer radius curved surface is the image plane of the lens; the angular period of the transmission metal grating is θ d , the angle of a single grating is θ a , the angular duty cycle of the grating is τ, τ=θ a / θ d ; The thickness of the dielectric substrate is t 1 ; The thickness of the transmissive metal grating is t 2 .

[0033] The transmittance T of the...

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Abstract

The present invention discloses a broadband low-loss terahertz far field super lens and an imaging method thereof. Transmission-type metal gratings with angle period distribution are employed, electromagnetic waves can be only existed in a TEM mode, evanescent waves can be converted to TEM cylindrical waves in a gradually opening planar waveguide to allow all the information to perform transmission without attenuation along the radial direction so as to realize super-resolution imaging through the channel transportation of the evanescent waves; the energy flow direction of the electromagnetic waves is along the radial direction, according to the angular momentum conservation, the tangential wave vectors of the evanescent waves are subjected to equal proportion compression to allow the evanescent waves to gradually convert to transmission waves and go on transmission after the electromagnetic waves capable of bearing target detail information departs from a lens so as to realize far field imaging; and when the Fabry-Perot oscillation happens, waves having different tangential wave vectors have the same transmissivity so as to realize complete work point of the lens. The broadband low-loss terahertz far field super lens and the imaging method thereof can effectively reduce the transmission loss, are easy to process and small in frequency influence on the lens electromagnetic parameters, and realize broadband imaging.

Description

technical field [0001] The invention relates to a terahertz far-field super-resolution imaging technology, in particular to a broadband low-loss terahertz far-field superlens and an imaging method thereof. Background technique [0002] In terms of frequency, terahertz wave (0.1THz~10THz) is between millimeter wave and far infrared; in terms of energy, it is between electrons and photons, and has many characteristics such as non-destructive, penetrating, and fingerprint characteristics. . Terahertz imaging technology is one of the main applications of terahertz waves. Terahertz waves can perform perspective imaging of non-transparent objects without harming the human body, so terahertz imaging has great application prospects in biomedicine, security inspections, and national defense and military. [0003] However, due to the existence of the diffraction limit, the litter wave carrying the detailed information of the target will decay exponentially during the transmission pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B3/00G02B27/58
CPCG02B3/005G02B27/58
Inventor 黄铁军汤恒河刘濮鲲
Owner PEKING UNIV
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