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Dai Zijie, Yang Jing, Gong Cheng, Zhang Nan, Sun Lu, Liu Weiwei. Optically controlled graphene based terahertz modulator[J]. Infrared and Laser Engineering, 2019, 48(1): 125001-0125001(6). doi: 10.3788/IRLA201948.0125001
Citation: Dai Zijie, Yang Jing, Gong Cheng, Zhang Nan, Sun Lu, Liu Weiwei. Optically controlled graphene based terahertz modulator[J]. Infrared and Laser Engineering, 2019, 48(1): 125001-0125001(6). doi: 10.3788/IRLA201948.0125001
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Optically controlled graphene based terahertz modulator

doi: 10.3788/IRLA201948.0125001
  • 1.

    Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology,Institute of Modern Optics,Nankai University,Tianjin 300350,China;

  • 2.

    Key Laboratory of Interfacial Physics and Technology and Laboratory of Physical Biology,Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China

  • Received Date: 2018-08-05
  • Rev Recd Date: 2018-09-03
  • Publish Date: 2019-01-25
  • A spectrally wide-band terahertz modulator based on monolayer graphene on germanium (GOG) was proposed. Utilizing a homemade THz-TDS (Terahertz-time domain spectroscopy) system, it was experimentally demonstrated that the THz modulator can be tuned by a 1 550 nm pump beam in a frequency range from 0.2 to 1.5 THz. The average transmittance of THz decreased from 40% to 22% when the pump power was increased to 250 mW, while the absorption coefficient averaged increased from 19 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 was 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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Optically controlled graphene based terahertz modulator

doi: 10.3788/IRLA201948.0125001
  • 1. Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology,Institute of Modern Optics,Nankai University,Tianjin 300350,China;
  • 2. Key Laboratory of Interfacial Physics and Technology and Laboratory of Physical Biology,Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China
  • Received Date: 2018-08-05
  • Rev Recd Date: 2018-09-03
  • Publish Date: 2019-01-25

Abstract: A spectrally wide-band terahertz modulator based on monolayer graphene on germanium (GOG) was proposed. Utilizing a homemade THz-TDS (Terahertz-time domain spectroscopy) system, it was experimentally demonstrated that the THz modulator can be tuned by a 1 550 nm pump beam in a frequency range from 0.2 to 1.5 THz. The average transmittance of THz decreased from 40% to 22% when the pump power was increased to 250 mW, while the absorption coefficient averaged increased from 19 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 was 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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