Optical Control of Mechanical Mode-Coupling within a MoS2 Resonator in the Strong-Coupling Regime

Chang Hua Liu, In Soo Kim, Lincoln J. Lauhon*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


Two-dimensional (2-D) materials including graphene and transition metal dichalcogenides (TMDs) are an exciting platform for ultrasensitive force and displacement detection in which the strong light-matter coupling is exploited in the optical control of nanomechanical motion. Here we report the optical excitation and displacement detection of a ∼3 nm thick MoS2 resonator in the strong-coupling regime, which has not previously been achieved in 2-D materials. Mechanical mode frequencies can be tuned by more than 12% by optical heating, and they exhibit avoided crossings indicative of strong intermode coupling. When the membrane is optically excited at the frequency difference between vibrational modes, normal mode splitting is observed, and the intermode energy exchange rate exceeds the mode decay rate by a factor of 15. Finite element and analytical modeling quantifies the extent of mode softening necessary to control intermode energy exchange in the strong coupling regime.

Original languageEnglish (US)
Pages (from-to)6727-6731
Number of pages5
JournalNano letters
Issue number10
StatePublished - Oct 14 2015


  • 2D materials
  • NEMS
  • Nanomechanics
  • optomechanics
  • strong coupling
  • transition metal dichalcogenide

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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