A Two-Dimensional Photonic Crystal Laser.

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  • Inoue Kuon
    Research Institute for Electronic Science, Hokkaido University, Sapporo 060–0812, Japan
  • Sasada Michihide
    Research Institute for Electronic Science, Hokkaido University, Sapporo 060–0812, Japan
  • Kawamata Jun
    Research Institute for Electronic Science, Hokkaido University, Sapporo 060–0812, Japan
  • Sakoda Kazuaki
    Research Institute for Electronic Science, Hokkaido University, Sapporo 060–0812, Japan
  • Haus Joseph W.
    Department of Physics, Rensselaer Polytechnic Institute, Troy, New York 12180–3590, U.S.A.

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  • Two-Dimensional Photonic Crystal Laser

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We report on observation of laser action unique to a two-dimensional (2D) photonic lattice. When dye-solution filled in air-holes of a 2D lattice was optically-pumped, laser action without external mirrors is found to occur at a specific wavelength corresponding to a flat band-dispersion in a high-symmetry direction of the 2D lattice plane; a small group-velocity is responsible for the lasing. On further increasing the pump-fluence, another laser action is also found to occur around a peak wavelength of the spontaneous emission spectrum. This lasing is interpreted of as arising from the so-called uncoupled modes possessing a high Q-value.

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