研究目的
Investigating the generation of multi-color coherent Smith-Purcell radiation with controllable direction from a 2D rectangular sub-wavelength hole array driven by a sheet free-electron beam.
研究成果
The proposed 2D sub-wavelength hole array driven by a sheet free-electron beam can generate multi-color coherent terahertz Smith-Purcell radiation with controllable direction in the 3D space. This could be developed as a promising terahertz source.
研究不足
The study is based on simulations, and practical implementation may face challenges such as precise control of the electron beam and fabrication of the sub-wavelength hole array with the required precision.
1：Experimental Design and Method Selection:
The study employs a two-dimensional rectangular sub-wavelength hole array (SHA) driven by a sheet free-electron beam (FEB) to generate Smith-Purcell radiation (SPR). The coherent radiation is achieved through constructive interference of radiation from all units in the array. The direction of radiation is controlled by adjusting the arrangement of the SHA.
2：Sample Selection and Data Sources:
The SHA is composed of periodically arranged rectangular sub-wavelength holes etched in a planar metallic plate. The FEB is modeled as a Gaussian bunch in longitudinal direction with uniformly distributed particles in the transverse direction.
3：List of Experimental Equipment and Materials:
The simulations are carried out using the FDTD-method-based particle-in-cell (PIC) simulation code. The metal plate is set as perfect electric conductor (PEC) in the terahertz region.
4：Experimental Procedures and Operational Workflow:
The study involves simulations to investigate the radiation from a single hole and then extends to the 2D SHA. The radiation spectrum and directivity diagrams are analyzed for different structural parameters and electron beam energies.
5：Data Analysis Methods:
The radiation spectrum and directivity diagrams are analyzed to understand the coherent radiation properties and the effect of structural parameters on the radiation direction.
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