Anisotropy of light extraction from GaN two-dimensional photonic crystals.
Angular distribution of light diffracted out of the plane of two-dimensional photonic crystals (PhC) has been studied in the azimuthal direction with a specially designed waveguide structure. The optical images of the light extraction patterns from the guided photoluminescence light are obtained with laser excitation in the center of the annual structure made on GaN multilayer. For increasing lattice constant, symmetric patterns with varying number of petals according to the symmetry of the PhC are observed. The appearance and disappearance of the petals can be explained using the Ewald construction in the reciprocal space. The dependence of light extraction on the lattice constant and orientation, and incident angle are investigated.
Lai
Chun-Feng
CF
Department of Photonics and Institute of Electro-Optical Engineering, National Chiao-Tung University, Hsinchu 300, Taiwan, ROC.
Chi
Jim-Yong
JY
Kuo
Hao-Chung
HC
Chao
Chia-Hsin
CH
Hsueh
Han-Tsung
HT
Wang
Jih-Fu Trevor
JF
Yeh
Wen-Yung
WY
D016880:Anisotropy; D003460:Crystallization / Q000379:methods; D004867:Equipment Design; D005708:Gallium / Q000737:chemistry*; D007834:Lasers; D008027:Light; D008962:Models, Theoretical; D053758:Nanoparticles; D055095:Optics and Photonics; D010777:Photochemistry / Q000379:methods*; D017785:Photons; D012542:Scattering, Radiation
C473348:gallium nitride; D005708:Gallium