Mr. Langfeng Zhou Profile

Langfeng Zhou

Masters Candidate at Nankai Univ

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Proceedings Article | 9 November 2018 Paper

Optically controlled graphene based terahertz modulator

Zijie Dai, Jing Yang, Qiang Su, Pengfei Qi, Dan Lu, Shuai Li, Langfeng Zhou, Weiwei Liu

Proceedings Volume 10826, 108261J (2018) https://doi.org/10.1117/12.2502204

KEYWORDS: Terahertz radiation, Modulators, Graphene, Germanium, Terahertz spectroscopy

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A spectrally wide-band terahertz modulator based on monolayer graphene on germanium (GOG) is proposed. Utilizing a homemade THz-TDS (Terahertz-time domain spectroscopy) system, we experimentally demonstrated that the THz modulator can be tuned by a 1550 nm pump beam in a frequency range from 0.2 to 1.5 THz. The average transmittance of THz decreases from 40% to 22% when the pump power is increased to 250 mW, while the absorption coefficient averaged increases from 19 cm^-1 to 44 cm^-1. The maximum modulation depth of the GOG modulator can reach as high as 62% at 0.38 THz and in a frequency range from 0.2 to 0.7 THz, the modulation depth is over 50%. Compared with bare Ge, it was proved that the modulation performance can be moderately enhanced by introducing monolayer graphene. This novel optically controlled graphene based THz modulator provides a feasible method for terahertz applications in communication and imaging.

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