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
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[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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