A terahertz band-stop filter

Abstract

The invention discloses a terahertz band-rejection filter comprising N×N identical units, which are periodically arranged on a plane perpendicular to the incident direction of the terahertz wave, and there is no space between adjacent units, N is an integer greater than or equal to 2, and a single The unit includes a first metal resonant layer, a second metal resonant layer, and a substrate; the first metal resonant layer is attached to the center of the upper surface of the substrate, and the second metal resonant layer is attached to the center of the lower surface of the substrate; the first metal resonator Both the first metal resonant layer and the second metal resonant layer are cross-shaped and have the same size; after the wave is incident, electromagnetic resonance is generated on the first metal resonant layer and the second metal resonant layer, and the electromagnetic energy at the resonant frequency is used to maintain electronic oscillation, thus Form the filter stopband. The invention has the advantages of rapid attenuation of the stop band, fine-tuning and wide-range adjustment of the bandwidth, simple structure and easy manufacture, low cost, etc., and simplifies the structure of the terahertz band-stop filter.

Description

technical field [0001] The invention relates to the field of terahertz functional devices and the technical field of electromagnetic filtering, in particular to a terahertz band-stop filter. Background technique [0002] Terahertz waves refer to electromagnetic waves with a frequency in the range of 0.1-10THz, which have excellent characteristics such as wide bandwidth, low energy, no damage to substances, and good penetration. At present, terahertz technology has been widely used in imaging, communication, biomedicine and other fields. [0003] In addition to the terahertz source and detector, a complete terahertz system also needs various functional devices such as modulators, filters, absorbers, etc. to regulate the wave. The role of the filter is to perform frequency selection, that is, to pass through a specific wave and block waves other than a specific frequency. The current existing terahertz filters are mainly based on slab dielectric waveguides, photonic crystals...

AI Technical Summary

Problems solved by technology

The current existing terahertz filters are mainly based on flat dielectric waveguides, photonic crystals and other structures, which have the disadvantages of slow attenuation, complex structures, and difficulty in processing, and it is difficult for the same filter to achieve small and large bandwidth adjustments at the same time.

[0004] Based on the above problems, how to design a terahertz filter with simple structure, wide bandwidth adjustment range, steep insertion loss curve and easy fabrication has become an urgent problem in this field.

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