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Coherent terahertz Smith–Purcell radiation from Dirac semimetals grating with very deep and narrow slits

Journal Article


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Abstract


  • We demonstrate a physical mechanism of multicolor coherent terahertz (THz) Smith–Purcell radiation from surface plasmon polaritons (SPPs). In Dirac semimetals gratings with very deep and narrow slits, two types of SPP modes, the cavity and ordinary SPP modes, can be excited by fast electrons under different excitation conditions and then diffracted into radiation in specific directions. The radiation intensity is remarkably enhanced when SPPs are excited, and frequencies can be widely tuned by adjusting the parameters of grating and electrons. Our findings could provide a promising way for developing room temperature, coherent, tunable, directional, and intense THz radiation sources.

Authors


  •   Zhao, Tao (external author)
  •   Hu, Min (external author)
  •   Lian, Zhen (external author)
  •   Zhong, Renbin (external author)
  •   Gong, Sen (external author)
  •   Chao Zhang
  •   Liu, Shenggang (external author)

Publication Date


  • 2018

Citation


  • Zhao, T., Hu, M., Lian, Z., Zhong, R., Gong, S., Zhang, C. & Liu, S. (2018). Coherent terahertz Smith–Purcell radiation from Dirac semimetals grating with very deep and narrow slits. Applied Physics Express, 11 (8), 082801-1-082801-4.

Scopus Eid


  • 2-s2.0-85050985242

Ro Full-text Url


  • https://ro.uow.edu.au/cgi/viewcontent.cgi?article=3143&context=eispapers1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/2137

Start Page


  • 082801-1

End Page


  • 082801-4

Volume


  • 11

Issue


  • 8

Place Of Publication


  • United Kingdom

Abstract


  • We demonstrate a physical mechanism of multicolor coherent terahertz (THz) Smith–Purcell radiation from surface plasmon polaritons (SPPs). In Dirac semimetals gratings with very deep and narrow slits, two types of SPP modes, the cavity and ordinary SPP modes, can be excited by fast electrons under different excitation conditions and then diffracted into radiation in specific directions. The radiation intensity is remarkably enhanced when SPPs are excited, and frequencies can be widely tuned by adjusting the parameters of grating and electrons. Our findings could provide a promising way for developing room temperature, coherent, tunable, directional, and intense THz radiation sources.

Authors


  •   Zhao, Tao (external author)
  •   Hu, Min (external author)
  •   Lian, Zhen (external author)
  •   Zhong, Renbin (external author)
  •   Gong, Sen (external author)
  •   Chao Zhang
  •   Liu, Shenggang (external author)

Publication Date


  • 2018

Citation


  • Zhao, T., Hu, M., Lian, Z., Zhong, R., Gong, S., Zhang, C. & Liu, S. (2018). Coherent terahertz Smith–Purcell radiation from Dirac semimetals grating with very deep and narrow slits. Applied Physics Express, 11 (8), 082801-1-082801-4.

Scopus Eid


  • 2-s2.0-85050985242

Ro Full-text Url


  • https://ro.uow.edu.au/cgi/viewcontent.cgi?article=3143&context=eispapers1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/2137

Start Page


  • 082801-1

End Page


  • 082801-4

Volume


  • 11

Issue


  • 8

Place Of Publication


  • United Kingdom