title: Dynamics of impurity attraction and repulsion of an intrinsic localized mode in a driven 1-D cantilever array.
abstract: Both low frequency and high frequency impurity modes have been produced in a SiN micromechanical cantilever array by illumination with either an infrared or visible laser. When such laser-induced impurities are placed near a driven intrinsic localized mode (ILM), it is either repelled or attracted. By measuring the linear response spectrum for these two cases, it was found that vibrational hopping of the ILM takes place when the natural frequency of the ILM and an intrinsic even symmetry linear local mode are symmetrically located about the driven ILM frequency so that parametric excitation of these two linear modes is enhanced, amplifying the lateral motion of the ILM. Numerical simulations are consistent with these signature findings. It is also demonstrated that the correct sign of the observed interaction can be found with a harmonic lattice-impurity model but the magnitude of the effect is enhanced in a nonlinear lattice.
authors: Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa 920-1192, Japan.
authors: M
authors: M
authors: Sato
authors: Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa 920-1192, Japan.
authors: Y
authors: Y
authors: Sada
authors: Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa 920-1192, Japan.
authors: W
authors: W
authors: Shi
authors: Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa 920-1192, Japan.
authors: S
authors: S
authors: Shige
authors: Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa 920-1192, Japan.
authors: T
authors: T
authors: Ishikawa
authors: Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa 920-1192, Japan.
authors: Y
authors: Y
authors: Soga
authors: Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853-2501, USA.
authors: B E
authors: BE
authors: Hubbard
authors: Cornell Nanoscale Science and Technology Facility, Cornell University, Ithaca, New York 14853-2501, USA.
authors: B
authors: B
authors: Ilic
authors: Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853-2501, USA.
authors: A J
authors: AJ
authors: Sievers