Observation of robust flat-band localization in driven photonic rhombic lattices

Sebabrata Mukherjee, Robert R. Thomson

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We demonstrate that a flat-band state in a quasi-one-dimensional rhombic lattice is robust in the presence of external drivings along the lattice axis. The lattice was formed by periodic arrays of evanescently coupled optical waveguides, and the external drivings were realized by modulating the paths of the waveguides. We excited a superposition of flat-band eigenmodes at the input and observed that this state does not diffract in the presence of static as well as high-frequency sinusoidal drivings. This robust localization is due to destructive interference of the analogous wavefunction and is associated with the symmetry in the lattice geometry. We then excited the dispersive bands and observed Bloch
oscillations and coherent destruction of tunneling respectively.
Original languageEnglish
Pages (from-to)2243-2246
Number of pages4
JournalOptics Letters
Issue number12
Early online date2 May 2017
Publication statusPublished - 15 Jun 2017


  • Integrated optics
  • Classical and quantum physics
  • Guided waves
  • Waveguides
  • Micro-optics
  • Bloch oscillations
  • flat bands
  • Localization


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