title: Coupling the normal incident light into waveguide modes of DBR mirrors via a diffraction grating.
abstract: Here we numerically and experimentally demonstrate the conversion of normally incident light into the guiding modes of distributed Bragg reflector (DBRs) mirror. By fabricating a gold grating onto a 7.5 pairs TiO2/SiO2DBR mirror, a series of asymmetrical resonances have been formed at the bandgap range of the DBR mirror. The detailed numerical calculations show that these Fano resonances are attributed to the coupling of incident waves into guiding modes of the DBR mirror. Compared with the other resonances, this coupling mechanism can be simply realized and it has also been revealed to be quite robust to the environmental changes, making the conversion between propagating waves and guiding waves to be practically interesting for many applications.
authors.affiliation: Department of Material Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China.
authors.forename: Wenhong
authors.initials: W
authors.lastname: Yang
authors.affiliation: Department of Material Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China.
authors.forename: Shang
authors.initials: S
authors.lastname: Sun
authors.affiliation: Department of Material Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Zhang
authors.affiliation: National Key Laboratory on Tunable Laser Technology, Department of Electrical and Information Engineering, Harbin Institute of Technology, Shenzhen, 518055, China.
authors.forename: Jiankai
authors.initials: J
authors.lastname: Li
authors.affiliation: Department of Material Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China.
authors.forename: Zonghui
authors.initials: Z
authors.lastname: Duan
authors.affiliation: National Key Laboratory on Tunable Laser Technology, Department of Electrical and Information Engineering, Harbin Institute of Technology, Shenzhen, 518055, China.
authors.forename: Qinghai
authors.initials: Q
authors.lastname: Song
authors.affiliation: Department of Material Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China.
authors.forename: Shumin
authors.initials: S
authors.lastname: Xiao