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Large-angle polarization detection metasurface based on dielectric cylinder structure

A dielectric column and large-angle technology, applied in the field of electromagnetic wave phase regulation, can solve problems such as not being able to meet application requirements, and achieve the effects of large structural phase response angle tolerance, ingenious design, and simple structure

Active Publication Date: 2020-06-19
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the direction of incident light is limited to a fixed angle, which cannot meet the actual application requirements.

Method used

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  • Large-angle polarization detection metasurface based on dielectric cylinder structure
  • Large-angle polarization detection metasurface based on dielectric cylinder structure
  • Large-angle polarization detection metasurface based on dielectric cylinder structure

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Embodiment 1

[0033] Without loss of generality, the large-angle polarization detection metasurface device in the mid-infrared band is selected here, and the invention is also applicable to the optical band, terahertz band and microwave band. Such as figure 1 As shown, the unit structure includes: a dielectric column 1 and a dielectric substrate 2, all of which are made of silicon. In this embodiment, CST electromagnetic simulation software is used to simulate and test the performance of the device.

[0034]For the design and control of the linear polarization structure, the transmission phase method is adopted, that is, the long axis and short axis (L, W) of the elliptical cylinder are changed to adjust the transmission phase. In order to reduce the amount of calculation without affecting the effect, the phase selection adopts the eighth-order discretization method. The unit structure is optimized so that the phase adjustment from 0 to 2π can be realized under the condition of large-angl...

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Abstract

The invention provides a large-angle polarization detection metasurface based on a dielectric structure. The large-angle polarization detection metasurface comprises a dielectric cylinder and a dielectric substrate from top to bottom. The large-angle polarization detection metasurface is ingenious in design, simple in structure and large in structural phase response angle tolerance. The focusing phase is designed through the secondary phase, and wavefront information of large-angle incident light is obtained. In addition, polarization detection of large-angle incident light is achieved by correcting Stokes parameters, and the field angle can reach + / -40 degrees. The large-angle polarization detection metasurface provided by the invention can be used for designing large-angle metasurface functional devices such as polarization detection, polarization imaging, wavefront detection and the like, and has an important significance for promoting the practicability of the metasurface.

Description

technical field [0001] The invention relates to the technical field of electromagnetic wave phase regulation, in particular to a metasurface device for realizing large-angle polarization detection based on a dielectric column structure. Background technique [0002] Polarization probing is the measurement of the polarization state of the target scene light. Among the representation methods of the polarization state, the Stokes vector method can represent any polarization state and is easy to detect, which has obvious advantages, so it has been widely used in polarization detection. The traditional polarization detection methods can be divided into time-sharing type and simultaneous type. Time-sharing polarization detection relies on rotating polarizers or phase retarders to modulate the incident light of the scene, so it requires a long detection time and also requires a stationary detection system and scene. In order to make up for this design defect and realize the detec...

Claims

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Application Information

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IPC IPC(8): G01J4/00
CPCG01J4/00G01J4/04
Inventor 罗先刚马晓亮蒲明博李雄张雅鑫
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI