研究目的
Investigating the generation of terahertz radiation through nonlinear mixing of lasers on a carbon nanotubes embedded metal surface.
研究成果
The THz power shows resonant enhancement at the plasmon resonance frequency. The polar angle at which the THz radiation is maximum initially rises with normalized frequency up to a certain point and then saturates. The average normalized power is rather low at off resonant frequencies but is huge at the resonance with a narrow bandwidth due to collision frequency dependency.
研究不足
The treatment is limited to electron excursion less than the radius of the nanotube and Debye length. Collisions are a limiting factor and cause heating of CNTs.
1：Experimental Design and Method Selection:
The study proposes a scheme for terahertz generation using carbon nanotubes (CNTs) embedded on a metal surface irradiated by two laser beams. The lasers exert a ponderomotive force on CNT electrons, producing a nonlinear current that turns the nanotubes into an array of antennae emitting THz radiation.
2：Sample Selection and Data Sources:
The interface is embedded by a layer of carbon nanotubes characterized by specific dimensions and free electron density.
3：List of Experimental Equipment and Materials:
Two S-polarized lasers, carbon nanotubes embedded on a metal surface.
4：Experimental Procedures and Operational Workflow:
The lasers are obliquely incident on the surface, imparting oscillatory velocities to electrons of the nanotubes and exerting a beat frequency Lorentz force on them, driving a transverse current.
5：Data Analysis Methods:
The study analyzes the nonlinear THz current density induced by the nonlinear mixing of lasers and the radiation field due to the nanotube array.
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