Abstract
A triple-layer omni-directional reflector (ODR), which consists of a semiconductor, a transparent quarter-wavelength dielectric layer, and a metal layer, has high reflectivity at all angles of incidence when used as an internal ODR. In this paper, triple-layer ODRs are demonstrated that incorporate nanoporous SiO2, a new low-refractive-index (low-n) material with refractive index << 1.46. Internal reflectivity measurements, including the angular dependence of R, are presented. The angle-integrated TE/TM-averaged reflectivity of the triple-layer reflector using nanoporous SiO2 is 99.4 %. This is the highest ever reported averaged reflectivity for an internal ODR. The mirror loss of the triple-layer ODR is a factor of 7 lower than the mirror loss of conventional metal reflectors. The results indicate the great potential of the ODR for light-emitting diodes with high light-extraction efficiency.
© 2005 Optical Society of America
PDF ArticleMore Like This
Th. Gessmann, Y.-L. Li, J. W. Graff, E. F. Schubert, K. Streubel, and J. K. Sheu
CMQ3 Conference on Lasers and Electro-Optics (CLEO:S&I) 2003
Jong Kyu Kim, J.-Q. Xi, Hong Luo, E. Fred Schubert, Jaehee Cho, Cheolsoo Sone, and Yongjo Park
JWB75 Conference on Lasers and Electro-Optics (CLEO:S&I) 2006
Y. J. Lee, T.C. Lu, H.C. Kuo, S.C. Wang, T. C. Hsu, M. H. Hsieh, M. J. Jou, and B. J. Lee
CTuE3 Conference on Lasers and Electro-Optics (CLEO:S&I) 2006