Multi-wavelength near infrared absorber insensitive to polarization
An absorber and near-infrared technology, applied in the infrared field, can solve the problem that the working wavelength cannot meet the system anti-interference, etc., and achieve the effect of polarization insensitive incident angle, easy implementation, and wide incident angle.
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[0022] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.
[0023] The multi-wavelength metamaterial absorber of the present invention has an infinite period structure and includes a plurality of absorbing units continuously arranged.
[0024] Such as figure 1 , 2 As shown in 3, the absorption unit includes: a substrate (1), a gold film (2), and a gold nanocavity (21); wherein the gold film (2) is closely attached to the upper surface of the substrate (1); The gold nanocavity (21) is a "cross"-shaped groove, located in the center of the structural unit, and is engraved from the upper surface of the gold film (2) to a certain depth in the gold film (2) but not penetrated; the metal nano The cavity (21) is filled with lossless electromagnetic wave material.
[0025] As an example, the structure size parameters of each absorption unit are as follows: lattice period P=310 nm; thickness t of the gold film (1) = 1000...
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