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Strong terahertz absorption of monolayer graphene embedded into a microcavity

Journal Article


Abstract


  • Terahertz reflection behaviors of metallic-grating-dielectric-metal (MGDM) microcavity with a monolayer graphene embedded into the dielectric layer are theoretically investigated. A tunable wideband reflection dip at about the Fabry–Pérot resonant frequency of the structure is found. The reflectance at the dip frequency can be electrically tuned in the range of 96.5% and 8.8%. Because of the subwavelength distance between the metallic grating and the monolayer graphene, both of the evanescent grating slit waveguide modes and the evanescent Rayleigh modes play key roles in the strong absorption by the graphene layer. The dependence of reflection behaviors on the carrier scattering rate of graphene is analyzed. A prototype MGDM-graphene structure is fabricated to verify the theoretical analysis. Our investigations are helpful for the developments of electrically controlled terahertz modulators, switches, and reconfigurable antennas based on the MGDM-graphene structures.

Publication Date


  • 2021

Citation


  • Guo, X., Xue, L., Yang, Z., Xu, M., Zhu, Y., Shao, D., . . . Zhang, C. (2021). Strong terahertz absorption of monolayer graphene embedded into a microcavity. Nanomaterials, 11(2), 1-12. doi:10.3390/nano11020421

Scopus Eid


  • 2-s2.0-85100451582

Web Of Science Accession Number


Start Page


  • 1

End Page


  • 12

Volume


  • 11

Issue


  • 2

Abstract


  • Terahertz reflection behaviors of metallic-grating-dielectric-metal (MGDM) microcavity with a monolayer graphene embedded into the dielectric layer are theoretically investigated. A tunable wideband reflection dip at about the Fabry–Pérot resonant frequency of the structure is found. The reflectance at the dip frequency can be electrically tuned in the range of 96.5% and 8.8%. Because of the subwavelength distance between the metallic grating and the monolayer graphene, both of the evanescent grating slit waveguide modes and the evanescent Rayleigh modes play key roles in the strong absorption by the graphene layer. The dependence of reflection behaviors on the carrier scattering rate of graphene is analyzed. A prototype MGDM-graphene structure is fabricated to verify the theoretical analysis. Our investigations are helpful for the developments of electrically controlled terahertz modulators, switches, and reconfigurable antennas based on the MGDM-graphene structures.

Publication Date


  • 2021

Citation


  • Guo, X., Xue, L., Yang, Z., Xu, M., Zhu, Y., Shao, D., . . . Zhang, C. (2021). Strong terahertz absorption of monolayer graphene embedded into a microcavity. Nanomaterials, 11(2), 1-12. doi:10.3390/nano11020421

Scopus Eid


  • 2-s2.0-85100451582

Web Of Science Accession Number


Start Page


  • 1

End Page


  • 12

Volume


  • 11

Issue


  • 2