Prof. Lichuan Jin Profile

Prof. Lichuan Jin

at Univ of Electronic Science and Technology of China

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Proceedings Article | 29 April 2022 Paper

The design of all-optical terahertz modulator based on graphene/TiO2@Pt/Si heterojunction

Miaoqing Wei, Lichuan Jin, Huaiwu Zhang

Proceedings Volume 12255, 1225507 (2022) https://doi.org/10.1117/12.2639220

KEYWORDS: Modulation, Modulators, Platinum, Graphene, Silicon, Photodetectors, Heterojunctions

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In recent years, graphene/silicon-based terahertz modulators have made great progress. Compared with electrical modulation, all-optical terahertz modulators have more advantages because of their larger modulation depth. In this paper, a multifunctional all-optical terahertz modulators based on graphene/TiO₂@Pt/Si has been designed and implemented, which can function as a terahertz modulator and a photodetector simultaneously. By introducing platinum nanoparticles coated with TiO₂ at the interface of traditional silicon/graphene modulator, electrons are introduced into the high mobility graphene layer through TiO₂ in the light state, which enhance the terahertz modulation depth of the device. In the dark state, the existence of platinum particles reduces the carrier lifetime of the device, which makes the photogenerated carriers quickly compound in the interface TiO₂ layer and improves the light response speed of the device. The results show that the terahertz modulation depth of the multifunctional composite device can reach 81%, and the dynamic modulation speed can reach 7.8 kHz. At the same time, it can realize the high-speed self-driven detection of 808 nm modulated light, and its response speed can reach 55 μs.

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