Exact dynamic localization in curved AlGaAs optical waveguide arrays

Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, Canada
Optics Express (Impact Factor: 3.53). 04/2007; 15(6):3212-23. DOI: 10.1364/OE.15.003212
Source: PubMed

ABSTRACT We present experimental observations of exact dynamic localization of an optical beam in a periodically curved AlGaAs waveguide array. The dynamic localization of the beam is "exact" in that it is observed even when the photonic band of the array is not well described in the nearest-neighbor tight-binding approximation. We present the spatial evolution of the beam around the two-period plane in the structure, explicitly demonstrating the delocalization and subsequent relocalization of the beam. We also emonstrate the strong wavelength dependence of the beam relocalization for a four period structure.

  • [Show abstract] [Hide abstract]
    ABSTRACT: We explore the terahertz (THz) radiation from high-order harmonic fields in semiconductor quantum dots driven by gigahertz (GHz) waves, due to the availability of high power GHz sources. By mapping the optical problem to a transport problem, we are able to uncover several features in the THz wave generation processes. With the help of the Floquet theorem, the efficiency of THz wave generation, which is related to the particle transport, is determined by the bandwidth of the quasienergy spectrum. We not only reveal the interesting relation between optical processes and transport phenomena, but also find the optimal conditions (corresponding to resonances) and quench conditions (corresponding to band collapses) for THz wave generation. The nice on/off properties (the ratio of emission intensity at resonance to that at quench condition ˜106 ) are helpful for the design of THz source and have important applications in nanodevices with THz wave involved.
    Physical review. B, Condensed matter 10/2009; 80(16):161304-. DOI:10.1103/PhysRevB.80.161304 · 3.66 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We suggest a method for trapping photons in quasi one-dimensional waveguide or coupled-resonator lattices, which is based on an optical analogue of the Aharonov-Bohm cages for charged particles. Light trapping results from a destructive interference of Aharonov-Bohm type induced by a synthetic magnetic field, which is realized by periodic modulation of the waveguide/resonator propagation constants/resonances.
    Optics Letters 07/2014; 39(20). DOI:10.1364/OL.39.005892 · 3.18 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: We study nondiffracting accelerating paraxial optical beams in periodic potentials, in both the linear and the nonlinear domains. In particular, we show that only a unique class of z-dependent lattices can support a true accelerating diffractionless beam. Accelerating lattice solitons, autofocusing beams and accelerating bullets in optical lattices are systematically examined.
    Optics Letters 04/2014; 39(7):2129-32. DOI:10.1364/OL.39.002129 · 3.18 Impact Factor

Full-text (2 Sources)

Available from
May 20, 2014