Full-Stokes terahertz meta-detector based on diatomic interference mechanism

Area of Science:

• Optics and Photonics
• Metamaterials
• Terahertz Technology

Background:

• Full-Stokes polarimetry is crucial for characterizing wave polarization, offering unique insights.
• Conventional metasurfaces struggle to integrate polarization generation and wavefront manipulation.
• Terahertz (THz) technology requires advanced polarization detection and beam control methods.

Purpose of the Study:

• To propose and demonstrate a novel terahertz (THz) meta-detector capable of simultaneous polarization detection and wavefront manipulation.
• To overcome the limitations of conventional metasurfaces in combining these functionalities.
• To establish a direct correlation between Stokes parameters and spatial focusing.

Main Methods:

• Development of a THz meta-detector utilizing the diatomic interference mechanism.
• Integration of six individual sub-metasurfaces, each designed for specific polarization conversion.
• Utilizing the meta-detector to establish a link between Stokes parameters and six distinct focal points.
• Validation through both electromagnetic simulations and experimental measurements.

Main Results:

• The proposed meta-detector successfully converts unpolarized waves into desired polarization states.
• A clear connection was established between the measured Stokes parameters and the six focal points.
• Both simulated and experimental results confirmed the high performance and functionality of the device.
• Demonstrated feasibility of integrated polarization detection and THz wavefront control.

Conclusions:

• The developed THz meta-detector offers a feasible and high-performance solution for polarization detection.
• This work presents a significant advancement in THz wavefront manipulation capabilities.
• The device provides a novel platform for integrated optical functionalities in the terahertz spectrum.