研究目的
Investigating the gigantic THz-range optical nonlinearity of graphene, including nonlinear THz conductivity, saturable absorption, and efficient THz high harmonics generation.
研究成果
Graphene possesses an enormous optical nonlinearity in the THz frequency range, caused by the collective, thermal response of its electrons to the THz excitation. The conversion from the pump field to harmonics was found to be extremely high, with nonlinear coefficients surpassing that of any other electronic materials by many orders of magnitude.
研究不足
The experiments were performed at room temperature, and the doping level of the samples corresponded to the Fermi energies in the range 0.1 - 0.2 eV.
1：Experimental Design and Method Selection:
Nonlinear THz spectroscopy experiments were performed at two different setups: a table-top laser-based system and a setup around the superradiant accelerator-based source TELBE.
2：Sample Selection and Data Sources:
Standard CVD-grown monolayer graphene samples deposited on fused silica substrates were used.
3：List of Experimental Equipment and Materials:
THz time-domain spectroscopy setups, ZnTe crystals for electrooptic sampling.
4：Experimental Procedures and Operational Workflow:
THz fields were sampled directly in the time domain using standard free-space electrooptic sampling in ZnTe crystals.
5：Data Analysis Methods:
Observation of nonlinear THz conductivity, saturable absorption, and THz high-harmonics generation in graphene.
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