Electromechanical tuning of vertically-coupled photonic crystal   nanobeams
  We present the design, the fabrication and the characterization of a tunable one-dimensional (1D) photonic crystal cavity (PCC) etched on two vertically-coupled GaAs nanobeams. A novel fabrication method which prevents their adhesion under capillary forces is introduced. We discuss a design to increase the flexibility of the structure and we demonstrate a large reversible and controllable electromechanical wavelength tuning (> 15 nm) of the cavity modes. 
L. Midolo, S. N. Yoon, F. Pagliano, T. Xia, F. W. M. van Otten, M.   Lermer, S. H\"ofling, A. Fiore
physics.optics