High-Performance Plasmonic Nanolasers with a Nanotrench Defect Cavity for Sensing Applications

Pi Ju Cheng, Zhen Ting Huang, Jhu Hong Li, Bo Tsun Chou, Yu Hsun Chou, Wei Cheng Lo, Kuo Ping Chen, Tien Chang Lu, Tzy Rong Lin

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


Recent developments in small footprint plasmonic nanolasers show promise for active optical sensing with potential applications in various fields, including real-time and label-free biochemical sensing, and gas detection. In this study, we demonstrate a novel hybrid plasmonic crystal nanolaser that features a ZnO nanowire placed on Al grating surfaces with a nanotrench defect nanocavity. The lasing action of gain-assisted defect nanocavity overcomes the ohmic loss parasitically in the plasmonic nanostructures. Therefore, the plasmonic nanolaser exhibits an extremely small mode volume, a narrow linewidth Δλ, and a high Purcell factor that can facilitate the strong interaction between light and matter. This can be used as a refractive index sensor and is highly sensitive to local changes in the refractive indices of ambient materials. By careful design, the near-ultraviolet nanolaser sensors have significant sensing performances of glucose solutions, revealing a high sensitivity of 249 nm/RIU and high resolution, with a figure of merit of 1132, at the resonant wavelength of 373 nm.

Original languageEnglish
Pages (from-to)2638-2644
Number of pages7
JournalACS Photonics
Issue number7
Publication statusPublished - 2018 Jul 18

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biotechnology
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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