研究目的
To improve the far-field properties of terahertz quantum cascade lasers (QCLs) based on double metal waveguides by designing a broadband antipodal Vivaldi antenna.
研究成果
The designed broadband antipodal Vivaldi antenna successfully improves the far-field properties of terahertz QCLs, producing a single-lobed pattern with a beam width of less than 20° over a broad frequency range. The measurements agree well with simulations, confirming the antenna's effectiveness.
研究不足
The study is limited by the finite surface roughness and non-perfect interface and alignment between the waveguide and antenna, which may affect the far-field pattern.
1：Experimental Design and Method Selection:
The study involved designing and fabricating a broadband antipodal Vivaldi antenna to improve the far-field properties of terahertz QCLs. Numerical simulations were used to predict the antenna's performance.
2：Sample Selection and Data Sources:
The antenna was tested with terahertz QCLs operating in the frequency range of
3：5-5 THz. List of Experimental Equipment and Materials:
The setup included terahertz QCLs, a broadband antipodal Vivaldi antenna, and a pyroelectric THz detector mounted on a scanning stage.
4：Experimental Procedures and Operational Workflow:
The antenna was fabricated using standard photolithography and metallization steps. Far-field measurements were performed by scanning the detector across the emitted beam.
5：Data Analysis Methods:
The measured far-field patterns were compared with numerical simulations to validate the antenna's performance.
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