Broadband terahertz linear polarization wave asymmetric transmission device based on metamaterial

Abstract

The invention discloses a broadband terahertz linear polarization wave asymmetric transmission device based on a metamaterial, and belongs to the field of transmission control devices of electromagnetic waves. The device comprises several basic units which are periodically arranged on an xy plane in the same direction, wherein each basic unit comprises five layers of structures which are arrangedsequentially, namely the dielectric layer 1, the metal layer 2, the dielectric layer 3, the metal layer 4 and the dielectric layer 5 from top to bottom in sequence, and the thickness of the dielectriclayer 3 is generally far larger than the that of the dielectric layer 1 and the dielectric layer 5; the metal layer 2 and the metal layer 4 are metal graphs which are constituted at the two sides ofthe dielectric layer 3 through technologies like photoetching or electron beam lithography; the graph constituted by the metal layer 4 is obtained by rotating the graph of the metal layer 2 by 90 degrees along the axis or through mirror symmetry. Dielectric film at the upper layer and the lower layer can be used for protecting the metal layers against abrasion and the stability of the device. Thebroadband terahertz linear polarization wave asymmetric transmission device is simple in structure and easy to prepare; one-way transmission of broadband terahertz linear polarization conversion is effectively achieved, and the device has an important significance in developing terahertz functional devices.

Description

technical field [0001] The invention belongs to the field of electromagnetic wave transmission control devices, in particular to a broadband terahertz linearly polarized wave asymmetric transmission device based on metamaterials. Background technique [0002] Terahertz (THz) waves usually refer to electromagnetic waves with a frequency of 0.3 to 3 THz (or a wavelength of 0.1 to 1mm). They are between microwave and millimeter waves and infrared optics. The area where theory transitions to microscopic quantum theory. Terahertz waves have important research value and application prospects in basic research disciplines such as physics, chemistry and life sciences, as well as applied disciplines such as medical imaging, safety inspection, product inspection, space communication and weapon guidance, and have attracted the attention of countries all over the world. However, because it is difficult for conventional materials to generate electromagnetic responses, especially magneti...

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Problems solved by technology

[0006] In view of the lack of research on the asymmetric transmission of linearly polarized waves in the terahertz frequency range in the prior art, especially the broadband structure, which leads to the problem of fewer terahertz asymmetric transmission devices, the present invention proposes a broadband terahertz transmission based on metamaterials. Hertzian Linearly Polarized Wave Asymmetric Transmission Device

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