研究目的
To design a broadband reflective polarization converter for terahertz waves that can convert x-polarized waves into y-polarized waves with high efficiency over a wide frequency range.
研究成果
The proposed reflective polarization converter can convert x-polarized waves into y-polarized waves in the frequency range from 0.508 5—1.451 6 THz with PCR greater than 80%. The physical mechanism of the linear polarization conversion is interpreted by studying the surface current distributions. The simulated results are in agreement with measured results.
研究不足
The measured results are lower than simulated results due to the absorption of water vapor.
1：Experimental Design and Method Selection:
The polarization converter is designed with a unit cell composed of a single-split resonant ring, a double-split resonant ring, a dielectric substrate, and a metallic ground. The design is simulated using CST Microwave Studio
2：Sample Selection and Data Sources:
20 The experimental sample is fabricated with an area of 10 mm×10 mm, containing 125×125 unit cells.
3：List of Experimental Equipment and Materials:
The metasurface and metallic film are made of lossy gold with a conductivity of σ=4.56×107 S/m. The dielectric material is lossy quartz with a relative permittivity of 3.
4：56×107 S/m. The dielectric material is lossy quartz with a relative permittivity of Experimental Procedures and Operational Workflow:
75.
4. Experimental Procedures and Operational Workflow: The reflection coefficients and PCR are simulated and measured. Surface current distributions are analyzed to understand the polarization conversion mechanism.
5：Data Analysis Methods:
The Jones matrix is introduced to describe the reflection of linearly polarized incident fields through the polarization converter.
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