研究目的
Investigating the performance of a dual-operation mode terahertz modulator based on graphene, focusing on achieving high modulation depth in both broadband and single frequency operation modes.
研究成果
The study demonstrates a dual-operation mode high-performance THz modulator with a modulation depth larger than 75% in a broadband frequency range and at a single frequency of 0.76 THz. The proposed structure offers a promising approach for applications in terahertz technology.
研究不足
The operational bandwidth of hybrid graphene metamaterial devices is limited to about 0.25 THz due to the intrinsic limited bandwidth resonance property of metamaterial. The study focuses on the modulator's performance under specific conditions, and further optimization may be required for broader applications.
1：Experimental Design and Method Selection:
The study involves designing a THz modulator with a graphene-insulator-silicon structure topped on an Al substrate. The modulator's performance is evaluated in both pulse and coherent operation modes.
2：Sample Selection and Data Sources:
Monolayer graphene grown by standard chemical vapor deposition (CVD) process and transferred onto SiO2/Si wafer.
3：List of Experimental Equipment and Materials:
Homemade THz time-domain spectroscopy system, femtosecond fiber laser, InGaAs photoconductive antennas, TiAu electrodes.
4：Experimental Procedures and Operational Workflow:
The modulator's performance is tested under different gate voltages, with THz signals reflected from the device measured in time-domain.
5：Data Analysis Methods:
The modulation depth is calculated from the reflected THz signals, and the Fabry-Perot interference effect is analyzed for the coherent operation mode.
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