title: The optimal structure of two dimensional photonic crystals with the large absolute band gap.
abstract: This paper reports a new designed square lattice GaAs structure of two-dimensional photonic crystals with absolute band gap approach to 0.1623 (2πc/a), where a is the period of the square lattice. The optimal structure is obtained by combining the Geometry Projection Method and Finite Element Method. Both gradient information and symmetric control points are introduced to reduce the calculation cost. For benefit to the fabrication in reality, the structure is simplified by the combination of triangle and rectangular geometry. Through parameter optimization, the absolute band gap of the new structure is improved to 0.1735 (2πc/a), which is much larger than those reported before. The new PC structure is convenient and stab for fabrication, and may be found applications in the future optical devices.
authors: State Key Laboratory of Information Photonics and Optical Communications (Beijing University of Posts and Telecommunications), P.O. Box 72, Beijing 100876, China.
authors: Donglin
authors: D
authors: Wang
authors: Zhongyuan
authors: Z
authors: Yu
authors: Yumin
authors: Y
authors: Liu
authors: Pengfei
authors: P
authors: Lu
authors: Lihong
authors: L
authors: Han
authors: Hao
authors: H
authors: Feng
authors: Xiaotao
authors: X
authors: Guo
authors: Han
authors: H
authors: Ye
mesh_terms: D003198:Computer Simulation; D003460:Crystallization / Q000295:instrumentation*; D004867:Equipment Design; D020342:Finite Element Analysis; D008962:Models, Theoretical; D055095:Optics and Photonics / Q000295:instrumentation*; D017785:Photons; D012031:Refractometry / Q000295:instrumentation*