Non-periodic surface plasma grating type terahertz filter

Abstract

The invention provides a non-periodic surface plasma grating type terahertz filter which comprises a two-dimensional metal grating flat plate with a central circular through hole. The upper surface and the lower surface of the metal grating flat plate are symmetrically provided with non-periodic annular grooves, and the widths of the annular grooves are different. According to the non-periodic surface plasma grating type terahertz filter of a bull eye structure, a non-periodic structure is adopted to remove contradictions between transmission bands and sidelobes of a general periodic filter, and the sidelobe suppression ratio is improved. Compared with a traditional filter, the non-periodic surface plasma grating type terahertz filter has the advantages of being high in center frequency transmission rate, few in loss, high in selectivity, easy to adjust, convenient to manufacture and process, low in cost and the like.

Description

technical field [0001] The present invention mainly relates to a terahertz filter, in particular to an aperiodic surface plasmon grating type terahertz filter. Background technique [0002] At present, many countries are actively carrying out research on terahertz, and an upsurge of terahertz research has also been set off in China. Terahertz waves are between microwaves and light waves, and are the transition region from electronics to optics, and have important academic and applied research values. As early as the 1970s, terahertz waves attracted the attention of scientists. However, compared with microwaves and light waves, the generation methods and detection methods of this wave band are still very backward. Very limited, and basically still at the theoretical level, forming the so-called "terahertz gap" (Terahertz Gap). In recent years, great progress has been made in the actual generation technology of terahertz waves. With the emergence of quantum cascade lasers, ...

AI Technical Summary

Problems solved by technology

However, most of the filters are in the stage of laboratory research, and there is still a distance from practical use.

For example, the photonic crystal filter cannot be adjusted, and the loss is relatively large; the sidelobe suppression ratio of the ordinary periodic grating / surface plasmon terahertz filter is relatively low, and the grating terahertz filter is not adjustable

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