Gain-assisted light guiding at the subwavelength scale in a hybrid dielectric-loaded surface plasmon polariton waveguide based on a metal nanorod

Yusheng Bian, Zheng Zheng, Xin Zhao, Jing Xiao, Haitao Liu, Jiansheng Liu, Tao Zhou, Jinsong Zhu

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Hybrid dielectric-loaded plasmonic waveguide consisting of an inverted U-shaped high-index ridge covering atop a low-index polymer coated metal nanorod is proposed and numerically investigated. Through incorporating a gain medium either in the ridge or the buffer layer, the loss of the supported plasmonic mode can be effectively compensated. For a typical configuration comprising a 450 nm × 160 nm InGaAsP ridge with a 5-40 nm thick PMMA layer and a 30 nm wide Ag nanorod, the necessary gain required in InGaAsP for lossless propagation of the quasi-TE type symmetric hybrid mode can be as low as 3.45-9.85 cm -1, along with a subwavelength mode area (λ2/60- λ2/148) attainable simultaneously. The configuration potentially offers a promising solution to enable lossless light transport at the sub-diffraction-limited scale with low compensation gain, thereby opening venues for ultra-compact active plasmonic devices and circuits.

Original languageEnglish (US)
Article number335102
JournalJournal of Physics D: Applied Physics
Volume46
Issue number33
DOIs
StatePublished - Aug 21 2013

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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