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Modulation of terahertz radiation from graphene surface plasmon polaritons via surface acoustic wave

Journal Article


Abstract


  • We present a theoretical study of terahertz (THz) radiation induced by surface plasmon polaritons (SPPs) on a graphene layer under modulation by a surface acoustic wave (SAW). In our gedanken experiment, SPPs are excited by an electron beam moving on a graphene layer situated on a piezoelectric MoS 2 flake. Under modulation by the SAW field, charge carriers are periodically distributed over the MoS 2 flake, and this causes periodically distributed permittivity. The periodic permittivity structure of the MoS 2 flake folds the SPP dispersion curve back into the center of the first Brillouin zone, in a manner analogous to a crystal, leading to THz radiation emission with conservation of the wavevectors between the SPPs and the electromagnetic waves. Both the frequency and the intensity of the THz radiation are tuned by adjusting the chemical potential of the graphene layer, the MoS 2 flake doping density, and the wavelength and period of the external SAW field. A maximum energy conversion efficiency as high as ninety percent was obtained from our model calculations. These results indicate an opportunity to develop highly tunable and integratable THz sources based on graphene devices.

Authors


  •   Jin, Sichen (external author)
  •   Wang, Xinke (external author)
  •   Han, Peng (external author)
  •   Sun, Wenfeng (external author)
  •   Feng, Shengfei (external author)
  •   Ye, Jiasheng (external author)
  •   Chao Zhang
  •   Zhang, Yan (external author)

Publication Date


  • 2019

Citation


  • Jin, S., Wang, X., Han, P., Sun, W., Feng, S., Ye, J., Zhang, C. & Zhang, Y. (2019). Modulation of terahertz radiation from graphene surface plasmon polaritons via surface acoustic wave. Optics Express, 27 (8), 11137-11151.

Scopus Eid


  • 2-s2.0-85064460705

Number Of Pages


  • 14

Start Page


  • 11137

End Page


  • 11151

Volume


  • 27

Issue


  • 8

Place Of Publication


  • United States

Abstract


  • We present a theoretical study of terahertz (THz) radiation induced by surface plasmon polaritons (SPPs) on a graphene layer under modulation by a surface acoustic wave (SAW). In our gedanken experiment, SPPs are excited by an electron beam moving on a graphene layer situated on a piezoelectric MoS 2 flake. Under modulation by the SAW field, charge carriers are periodically distributed over the MoS 2 flake, and this causes periodically distributed permittivity. The periodic permittivity structure of the MoS 2 flake folds the SPP dispersion curve back into the center of the first Brillouin zone, in a manner analogous to a crystal, leading to THz radiation emission with conservation of the wavevectors between the SPPs and the electromagnetic waves. Both the frequency and the intensity of the THz radiation are tuned by adjusting the chemical potential of the graphene layer, the MoS 2 flake doping density, and the wavelength and period of the external SAW field. A maximum energy conversion efficiency as high as ninety percent was obtained from our model calculations. These results indicate an opportunity to develop highly tunable and integratable THz sources based on graphene devices.

Authors


  •   Jin, Sichen (external author)
  •   Wang, Xinke (external author)
  •   Han, Peng (external author)
  •   Sun, Wenfeng (external author)
  •   Feng, Shengfei (external author)
  •   Ye, Jiasheng (external author)
  •   Chao Zhang
  •   Zhang, Yan (external author)

Publication Date


  • 2019

Citation


  • Jin, S., Wang, X., Han, P., Sun, W., Feng, S., Ye, J., Zhang, C. & Zhang, Y. (2019). Modulation of terahertz radiation from graphene surface plasmon polaritons via surface acoustic wave. Optics Express, 27 (8), 11137-11151.

Scopus Eid


  • 2-s2.0-85064460705

Number Of Pages


  • 14

Start Page


  • 11137

End Page


  • 11151

Volume


  • 27

Issue


  • 8

Place Of Publication


  • United States