Terahertz filter with concentric square fractal hollow structure
A hollow structure, square technology, applied in the field of terahertz wave applications, can solve the problems of high cost, low filtering performance, complex structure, etc., and achieve the effect of convenient production, simple and compact structure, and low cost
Active Publication Date: 2020-05-26
CHINA JILIANG UNIV
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Problems solved by technology
However, most of the existing terahertz wave filters have many shortcomings such as complex structure, low filtering performance, and high cost. Therefore, it is of great significance to study terahertz wave filters with simple structure, low cost, and small size.
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Embodiment 1
[0023] In this embodiment, the structure of the concentric square fractal hollow structure and the shape of each component are as described above, so details are not repeated here. However, the specific parameters of each component are as follows:
[0024] The number of structural units N=40 is selected. Among the periodically arranged N×N structural units, the front view of each unit is a square, and the side length of the square is 350 μm. The material of the metal structure layer is aluminum with a thickness of 10 μm. The first-level fractal change includes the first hollow, the second hollow, the third hollow, and the fourth hollow have the same size, the longer outer side is 20 μm long, the shorter inner side is 10 μm long, and the width is 10 μm. Two adjacent hollows The width between them is 20 μm. The fifth hollow, sixth hollow, seventh hollow, and eighth hollow included in the secondary fractal change have the same size, the longer outer side is 50 μm long, the sho...
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The invention discloses a terahertz filter with a concentric square fractal hollow structure. The filter comprises a terahertz wave input end, a terahertz wave output end and N*N structural units, wherein N is a natural number, and the N*N structural unit are periodically arranged on a plane perpendicular to the input direction of a terahertz wave. Each of the structural units comprises a metal structure layer, the metal structure layer is a metal hollow body with a three-level fractal change, the first-level fractal change comprises a first hollow, a second hollow, a third hollow and a fourthhollow formed by two concentric squares, according to the self-similarity of a fractal, the second-level fractal change includes a fifth hollow, a sixth hollow, a seventh hollow and an eighth hollow,and the third-level fractal change includes a ninth hollow, a tenth hollow, an eleventh hollow, and a twelfth hollow. The terahertz filter with the concentric square fractal hollow structure of the invention has the advantages of simple and compact structure, convenient manufacture and low cost, and the application requirements in the fields of terahertz band imaging, mobile communication, biological detection, medical diagnosis and the like are satisfied.
Description
technical field [0001] The invention relates to the technical field of terahertz wave applications, in particular to a terahertz filter with a concentric square fractal hollow structure. Background technique [0002] As for the terahertz frequency band, it has been recorded as early as the 19th century, but terahertz was not systematically studied as an independent frequency band at that time. At that time, scientists divided this frequency band into the range of far-infrared bands for research. It was not until the 1980s that researchers slowly advanced the research of this frequency band to the terahertz frequency band and became a separate field for research. The electromagnetic wave in this section has many unique characteristics, so that it can be applied to many fields where photonics and electronics have never been involved or the use effect is not satisfactory. Terahertz waves are widely used in terahertz imaging, terahertz radar, terahertz biomedicine, terahertz c...
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IPC IPC(8): H01P1/20G02B5/20
CPCG02B5/20H01P1/20
Inventor 李九生严德贤
Owner CHINA JILIANG UNIV