Terahertz wave tunable mode converter

A mode converter, terahertz technology, applied in waveguide-type devices, optical waveguides, electrical components, etc., can solve the problems of low cut-off frequency, single high-order mode, and difficulty in suppressing fundamental mode, and achieve small size and simple structure. Compact, favorable for miniaturization and integration

Active Publication Date: 2015-09-16
HARBIN ENG UNIV
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  • Description
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Problems solved by technology

However, in many practical applications, different mode field distributions are required, and sometimes the fundamental mode needs to be suppressed to obtain a single higher-order mode
Since the fundamental mode has the lowest cutoff frequency, the suppression of the fundamental mode becomes a very difficult problem

Method used

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  • Terahertz wave tunable mode converter
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  • Terahertz wave tunable mode converter

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Embodiment Construction

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] The principle on which the present invention is based is:

[0019] The design principle of the terahertz waveguide tunable mode converter structure is as follows: the terahertz wave of the low-order mode is incident into the cylindrical metal inner wall waveguide, and the resonant interaction of the transverse standing wave mode occurs in the rectangular periodic undulation structure, which is output at the output end. A single high-level pattern. The dispersion curve of the mth order transverse mode can be given by:

[0020] f r ( m ) = c 2 π k r ( ...

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Abstract

The invention provides a terahertz wave tunable mode converter, which comprises a hollow cylindrical metal inner-wall waveguide formed by rectangular periodically fluctuating structures. According to the invention, resonance interaction among different transverse standing wave modes in the waveguide is utilized to realize conversion of terahertz waves from a fundamental mode to a single high-order mode. Furthermore, tuning for output frequency of the terahertz wave mode converter can be realized through changing the thickness of a metal coating in the rectangular periodically fluctuating pipe wall, and the tunable mode converter can realize that the output center frequency is linearly tunable in broadband. The terahertz wave tunable mode converter is reasonable in design, has the characteristics of simple structure, wide tunable range, low loss, high conversion efficiency, convenient integration and the like, can acquire wide applications in fields which have special requirements for terahertz wave mode field distribution and the operating frequency, and provides a new choice for designing and manufacturing functional devices in a terahertz wave application system.

Description

technical field [0001] The invention relates to a terahertz controllable functional device, in particular to a terahertz wave tunable mode converter, a terahertz wave tunable mode converter. Background technique [0002] Terahertz wave is between millimeter wave and infrared light wave. It not only has some advantages of millimeter wave and infrared light wave (such as good penetration, can effectively penetrate non-metallic substances, high imaging resolution, etc.), but also has perspective, The advantages of transient, high signal-to-noise ratio and low photon energy make it have important research value and far-reaching application prospects in the fields of imaging, radar, spectroscopy, medicine, communication and public safety. In recent years, the research on terahertz wave science and technology has become a research hotspot in the field of optics. The development of terahertz systems mainly includes radiation sources, detection devices and various functional device...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/14H01P1/16
CPCG02B6/14H01P1/16
Inventor 樊亚仙徐丹陶智勇徐兰兰桑汤庆
Owner HARBIN ENG UNIV
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