TY - JOUR
T1 - Symmetry Breaking in Photonic Crystals: On-Demand Dispersion from Flatband to Dirac Cones
AU - Nguyen, Hai
AU - Dubois, Florian
AU - Deschamps, Thierry
AU - Cueff, Sebastien
AU - Leclercq, Jean-Louis
AU - Seassal, Christian
AU - Letartre, Xavier
AU - Viktorovitch, Pierre
PY - 2018/2/9
Y1 - 2018/2/9
N2 - We demonstrate that symmetry breaking opens a new degree of freedom to tailor energy-momentum dispersion in photonic crystals. Using a general theoretical framework in two illustrative practical structures, we show that breaking symmetry enables an on-demand tuning of the local density of states of the same photonic band from zero (Dirac cone dispersion) to infinity (flatband dispersion), as well as any constant density over an adjustable spectral range. As a proof of concept, we demonstrate experimentally the transformation of the very same photonic band from a conventional quadratic shape to a Dirac dispersion, a flatband dispersion, and a multivalley one. This transition is achieved by finely tuning the vertical symmetry breaking of the photonic structures. Our results provide an unprecedented degree of freedom for optical dispersion engineering in planar integrated photonic devices.
AB - We demonstrate that symmetry breaking opens a new degree of freedom to tailor energy-momentum dispersion in photonic crystals. Using a general theoretical framework in two illustrative practical structures, we show that breaking symmetry enables an on-demand tuning of the local density of states of the same photonic band from zero (Dirac cone dispersion) to infinity (flatband dispersion), as well as any constant density over an adjustable spectral range. As a proof of concept, we demonstrate experimentally the transformation of the very same photonic band from a conventional quadratic shape to a Dirac dispersion, a flatband dispersion, and a multivalley one. This transition is achieved by finely tuning the vertical symmetry breaking of the photonic structures. Our results provide an unprecedented degree of freedom for optical dispersion engineering in planar integrated photonic devices.
U2 - 10.1103/PhysRevLett.120.066102
DO - 10.1103/PhysRevLett.120.066102
M3 - Article
VL - 120
JO - Physical review letters
JF - Physical review letters
IS - 066102
ER -