Design of dual electric control metasurface switch filter

Abstract

The invention discloses a metasurface switch filter based on vanadium dioxide and graphene, and belongs to the technical field of electromagnetic functional devices. The filter comprises a dielectric plate, a graphene layer located on the upper layer of the dielectric plate, a local electromagnetic field enhancement metal structure located on the upper layer of the graphene layer, a dielectric material bottom plate formed below the dielectric plate, and a periodic electric heating device. A resistance wire can be heated through external voltage, so that the conductivity of vanadium dioxide is changed, metasurface switch filtering is achieved, meanwhile, the Fermi level of graphene can be changed through bias voltage, and filtering frequency band fine tuning control can be achieved. Under the normal temperature state, a passband with the average transmittance of 90% is formed in the frequency band of 32 THz-45.7 THz, and under the power-on condition, a stop band with the resonance center frequency of 42.7 THz and the bandwidth of 6.3 THz is formed in the frequency band of 39.4 THz-45.7 THz.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic functional devices, and in particular relates to the design of a metasurface switch filter based on vanadium dioxide and graphene. Background technique [0002] Terahertz wave (Terahertz) is an electromagnetic wave located in the 0.1THz-10THz (30μm-3mm) frequency band, which has crossing areas with microwave and infrared bands. Therefore, Terahertz wave not only has its own unique characteristics, but also has microwave and The advantages of infrared waves, such as high transmittance, instantaneity, and broadband, make it have important application prospects in precision imaging and broadband communications. [0003] As a key component in the electromagnetic control system, the filter has important research value. Filters with wide stopband or passband, steep rising and falling edges, flexible tuning and other characteristics suitable for different systems are hot research directions at p...

AI Technical Summary

Problems solved by technology

[0004] Usually, once the periodic structure of metamaterials is determined, the filtering characteristics cannot be dynamically adjusted. In order to overcome the above shortcomings, there are tunable devices based on metamaterials, which can dynamically adjust electromagnetic waves through different external stimuli, such as temperature, laser, electric field, etc.

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