Four-band terahertz absorber with independent and continuously adjustable amplitude and frequency

Abstract

The invention provides a four-band terahertz absorber with independently and continuously adjustable amplitude and frequency. The device relates to the technical field of metamaterial and terahertz wave application. The main structure of the device comprises a dielectric substrate, a metal reflecting plate in the upper surface of the dielectric substrate, a dielectric substrate in the upper surface of the metal reflecting plate, and a composite resonance structure array in the upper surface of the dielectric substrate. Tunable materials of indium antimonide and photosensitive silicon are used,and the frequencies of four absorption frequency points are tuned by controlling the external temperature; the intensity of an external pump light source is controlled, the amplitudes of the four absorption frequency points are regulated and controlled, the effect that the amplitude and the frequency of an absorption peak are independently and continuously adjustable is achieved, and the workingfrequency band of the terahertz absorber is broadened. The four-band terahertz absorber has the advantages of strong functionality, insensitive polarization, simple structural design, strong practicability and the like.

Description

technical field [0001] The invention relates to the technical field of metamaterials and terahertz wave applications, in particular to a four-band terahertz absorber whose amplitude and frequency are independently and continuously adjustable. Background technique [0002] Terahertz electromagnetic metamaterials are artificial composite structures with extraordinary physical properties that do not exist under natural conditions, and absorbers designed based on metamaterials are a new type of artificially designed wave-absorbing materials. Because of its thin thickness, light weight, easy adjustment and other advantages, it has attracted the attention of many scholars. [0003] A microwave-absorbing material is a material that can efficiently absorb or greatly weaken incident electromagnetic waves. Using a variety of different loss mechanisms, electromagnetic waves are converted into heat or other forms of energy and gradually dissipated, finally achieving the effect of absorp...

AI Technical Summary

Problems solved by technology

[0005] With the artificially designed metamaterial absorber and clever use of various losses, single-frequency, multi-frequency, broadband and even frequency-modulated absorption effects can be achieved within the specified frequency range. In addition to frequency tunability, absorbers with adjustable amplitudes have also emerged; In addition, some absorbers are also required to be insensitive to the polarization angle of incident electromagnetic waves. However, as a new type of absorbing material, metamaterial absorbers are not yet fully mature in technology and process, resulting in relatively single functions and a wide range of applications. It still cannot fully meet the application needs of functional integration and miniaturization of terahertz absorbers

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