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Microwave polarization detection device based on photon spin Hall effect

A spin Hall effect and detection device technology, applied in the direction of electromagnetic field characteristics, can solve problems such as instability, different reflectivity, and damage to calibration

Active Publication Date: 2017-07-07
FUDAN UNIV
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Problems solved by technology

However, the reflection of the mirror or semi-reflective film will destroy the polarization state of the electromagnetic wave to be detected, because the reflectivity of S wave and P wave is not the same
In addition, the most fatal shortcoming of traditional optical polarization detection is that measuring the electromagnetic wave mode value and phase in two perpendicular directions with a linearly polarized horn is actually a secondary measurement problem, that is, when measuring another perpendicular direction, Need to rotate the bell mouth, this rotation process will destroy the previous calibration, bring errors and instability problems to the system

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  • Microwave polarization detection device based on photon spin Hall effect
  • Microwave polarization detection device based on photon spin Hall effect
  • Microwave polarization detection device based on photon spin Hall effect

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Embodiment Construction

[0024] The key to the design concept of the present invention is how to realize the efficient photon spin Hall effect, and decompose the electromagnetic wave to be detected into left-handed and right-handed circularly polarized light (such as figure 1 shown). We rotate the main axis of each specific medium unit in the two-dimensional periodic array around The shaft is rotated by a certain angle, and the rotation angle is along the The direction increases linearly, which constitutes the "rotating structure" electromagnetic metasurface. The "rotating structure" electromagnetic metamaterial metasurface is a pure phase modulation device of electromagnetic waves, and the additional geometric Bell phase comes from the geometric rotation angle of the metamedium unit (such as Figure 6 shown).

[0025] Design process of the present invention is theory, simulation and experiment trinity, specifically as follows:

[0026] 1. Theoretical part:

[0027]Starting from the Jones matri...

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Abstract

The invention belongs to the technical field of electromagnetic wave polarization detection, in particular to a high-efficiency microwave polarization detection device based on the photon spin Hall effect. The detection device of the present invention decomposes the electromagnetic wave to be detected into left-handed and right-handed circularly polarized light through the efficient "photon spin Hall effect", then measures its modulus and phase respectively, and reversely obtains the polarization of the electromagnetic wave to be detected. The "photon spin Hall effect" is realized through the linear geometric Bell phase gradient of the total reflection "rotation structure" electromagnetic metamaterial metasurface. Compared with the traditional polarization detection method (directly measuring the sum component of the electromagnetic wave with a facing linear polarization horn), the present invention has the advantages of being more convenient and quicker, with less error and better stability. The working frequency band of the present invention can be extended to other working frequency bands by scaling or redesigning the structural constants of the specific medium unit.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave polarization detection, and in particular relates to an electromagnetic wave polarization detection device. Background technique [0002] Conventional materials are composed of molecules or atoms, and the response of molecules and atoms to external electromagnetic waves determines the electromagnetic properties of the entire material. The idea of ​​electromagnetic metamedia is to carefully design some artificial "molecules and atoms", usually called metamedium units, and arrange them in a (two-dimensional or three-dimensional) array in the form of a certain macroscopic order to obtain a specific A "surface" or "crystal" that modulates electromagnetic waves. Electromagnetic metamedia greatly expands the degree of freedom for people to modulate electromagnetic waves, and has broad application prospects. [0003] Gradient Meta-surface refers to the arrangement of various meta-medium un...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/08
Inventor 罗伟杰何琼孙树林周磊
Owner FUDAN UNIV
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