Realization of UV Plasmonic Nanolasers With Extremely Small Mode Volume

Bo Tsun Chou*, Yu Hsun Chou, Chih Kai Chiang, Yen Mo Wu, Tzy Rong Lin, Sheng-Di Lin, Tien-chang Lu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


It is difficult to operate plasmonic nanolasers on silver films in the ultraviolet regime owing to the bending-back effect of surface plasmon dispersion. In this paper, we report on plasmonic lasers comprised of a ZnO nanowire lying on a single-crystalline silver film with a SiO2 spacer layer. The silver can strongly shrink the mode volume, thereby boosting the Purcell factor. Meanwhile, the SiO2 spacer thickness is optimized to adjust the surface plasmon dispersion curve so that the lasing wavelength can be located at a large dispersion region, thereby achieving a large group index of 55, an ultra-small effective mode volume of 3.5 × 10-3λ3, and low-threshold of 11 MW/cm2.

Original languageEnglish
Article number7160801
JournalIEEE Journal on Selected Topics in Quantum Electronics
Issue number6
StatePublished - 1 Nov 2015


  • nanowire
  • Plasmonic laser
  • silver
  • surface plasmon
  • ZnO

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