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

Sebabrata Mukherjee, Robert R. Thomson

Research output: Contribution to journalArticle

Abstract

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
Volume42
Issue number12
Early online date2 May 2017
DOIs
Publication statusPublished - 15 Jun 2017

Fingerprint

photonics
optical waveguides
destruction
waveguides
interference
symmetry
geometry

Keywords

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

Cite this

@article{fcc5e9afa826412d8a37d8220a51c1bf,
title = "Observation of robust flat-band localization in driven photonic rhombic lattices",
abstract = "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 Blochoscillations and coherent destruction of tunneling respectively.",
keywords = "Integrated optics, Classical and quantum physics, Guided waves, Waveguides, Micro-optics, Bloch oscillations, flat bands, Localization",
author = "Sebabrata Mukherjee and Thomson, {Robert R.}",
year = "2017",
month = "6",
day = "15",
doi = "10.1364/OL.42.002243",
language = "English",
volume = "42",
pages = "2243--2246",
journal = "Optics Letters",
issn = "0146-9592",
publisher = "Optical Society of America",
number = "12",

}

Observation of robust flat-band localization in driven photonic rhombic lattices. / Mukherjee, Sebabrata; Thomson, Robert R.

In: Optics Letters, Vol. 42, No. 12, 15.06.2017, p. 2243-2246.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Observation of robust flat-band localization in driven photonic rhombic lattices

AU - Mukherjee, Sebabrata

AU - Thomson, Robert R.

PY - 2017/6/15

Y1 - 2017/6/15

N2 - 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 Blochoscillations and coherent destruction of tunneling respectively.

AB - 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 Blochoscillations and coherent destruction of tunneling respectively.

KW - Integrated optics

KW - Classical and quantum physics

KW - Guided waves

KW - Waveguides

KW - Micro-optics

KW - Bloch oscillations

KW - flat bands

KW - Localization

U2 - 10.1364/OL.42.002243

DO - 10.1364/OL.42.002243

M3 - Article

VL - 42

SP - 2243

EP - 2246

JO - Optics Letters

JF - Optics Letters

SN - 0146-9592

IS - 12

ER -