A strongly coupled Λ-type micromechanical system

Hajime Okamoto, Ryan Schilling, Hendrik Schütz, Vivishek Sudhir, Dalziel J. Wilson, Hiroshi Yamaguchi, Tobias J. Kippenberg

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


We study a classical Λ-type three-level system based on three high-Q micromechanical beam resonators embedded in a gradient electric field. By modulating the strength of the field at the difference frequency between adjacent beam modes, we realize strong dynamic two-mode coupling, via the dielectric force. Driving adjacent pairs simultaneously, we observe the formation of a purely mechanical "dark" state and an all-phononic analog of coherent population trapping - signatures of strong three-mode coupling. The Λ-type micromechanical system is a natural extension of previously demonstrated "two-level" micromechanical systems and adds to the toolbox for engineering of all-phononic micromechanical circuits and arrays.

Original languageEnglish (US)
Article number153105
JournalApplied Physics Letters
Issue number15
StatePublished - Apr 11 2016
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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