META Conference, META'12

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Optomechanical Coupling in a Two-Dimensional Photonic Crystal Defect Cavity
Isabelle PHILIP, Rémy Braive, Emanuel GAVARTIN, Isabelle SAGNES, Olivier Arcizet, Alexios Beveratos, Tobias J. Kippenberg

Last modified: 2012-01-03


Periodically structured materials can sustain both optical and mechanical modes. Here
we investigate and observe experimentally the optomechanical properties of a conventional twodimensional
suspended photonic crystal defect cavity of diffraction-limited volume. Two families
of mechanical modes are observed. At low frequency (below 200 MHz), drum modes of the whole
membrane are observed, while at high frequency (around 1 GHz), the resonator exhibits modes
localized within the defect cavity, corresponding to a deformation of the core of the defect cavity
surrounded by holes. Due to the strong confinement and colocalization of photons and phonons in
these high-frequency localized modes, the coupling between light and these mechanical modes
exceed 80 kHz, demonstrating high coupling of optical and mechanical modes in such structures.


photonic crystals, optomechanics