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A strongly coupled Λ-type micromechanical system

2016; American Institute of Physics; Volume: 108; Issue: 15 Linguagem: Inglês

10.1063/1.4945741

1520-8842

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

Advanced MEMS and NEMS Technologies

We study a classical $\Lambda$-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 $\Lambda$-type micromechanical system is a natural extention of previously demonstrated 'two-level' micromechanical systems and offers new perspectives on the architecture of all-phononic micromechanical circuits and arrays.