Efficient microwave polarization detection device based on photonic spin Hall effect

Abstract

The invention belongs to the technical field of electromagnetic wave polarization detection, and particularly discloses an efficient microwave polarization detection device based on a photonic spin Hall effect. For the detection device, electromagnetic wave to be detected is decomposed into left-hand circularly polarized beam and right-hand circularly polarized beam through the efficient photonic spin Hall effect, the module values and phases of the left-hand circularly polarized beam and right-hand circularly polarized beam are respectively measured, and backstepping is carried out to obtain the polarization of the electromagnetic wave to be detected. The photonic spin Hall effect is realized through linear geometry Berry phase gradient of total-reflection type meta-surface with a spin structure. Compared with the traditional polarization detection manner (linear polarization loudspeakers opposite to each other are used for directly measuring x component and y component of electromagnetic wave), the efficient microwave polarization detection device has the advantages that higher convenience and quickness are achieved, the errors are few, and the stability is better. The operating frequency of the device is 10-14GHz, and the structure constants of meta-atoms are scaled in equal proportion or redesigned, so that the operating frequency can be applied to other operating frequency ranges.

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...

AI Technical Summary

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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