Terahertz band elimination filter

Abstract

The invention discloses a terahertz band elimination filter comprising N * N identical units which are periodically arranged on a plane perpendicular to the incident direction of terahertz waves. No interval exists between the adjacent units, and N is an integer larger than or equal to 2. Each unit comprises a first metal resonance layer, a second metal resonance layer and a substrate; the first metal resonance layer is attached to the center of the upper surface of the substrate, and the second metal resonance layer is attached to the center of the lower surface of the substrate. The first metal resonance layer and the second metal resonance layer are cross-shaped and have the same size. After wave incidence, electromagnetic resonance is generated on the first metal resonance layer and the second metal resonance layer, electromagnetic energy at the resonance frequency is used for maintaining electronic oscillation, so that a filtering stop band is formed. The terahertz band elimination filter has the advantages of being rapid in stop band attenuation, adjustable in bandwidth slightly or in a large range, simple in structure, easy to manufacture, low in cost and the like, and the structure of the terahertz band elimination filter is simplified.

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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