title: Transmission comb of a distributed Bragg reflector with two surface dielectric gratings.
abstract: The transmission behaviour of a distributed Bragg reector (DBR) with surface dielectric gratings on top and bottom is studied. The transmission shows a comb-like spectrum in the DBR band gap, which is explained in the Fano picture. The number density of the transmission peaks increases with increasing number of cells of the DBR, while the ratio of the average full width at half maximum to the corresponding average free spectral range, being only few percent for both transversal electric and magnetic waves, is almost invariant. The transmission peaks can be narrower than 0.1 nm and are fully separated from each other in certain wavebands. We further prove that the transmission combs are robust against randomness in the heights of the DBR layers. Therefore, the proposed structure is a candidate for an ultra-narrow-band multichannel filter or polarizer.
authors.affiliation: Beijing Key Lab of Nanophotonics &Ultrafine Optoelectronic Systems and School of Physics, Beijing Institute of Technology, Beijing 100081, China.
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Zhao
authors.affiliation: Beijing Key Lab of Nanophotonics &Ultrafine Optoelectronic Systems and School of Physics, Beijing Institute of Technology, Beijing 100081, China.|King Abdullah University of Science and Technology (KAUST), Physical Science and Engineering Division (PSE), Thuwal 23955-6900, Saudi Arabia.
authors.forename: Yongyou
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: King Abdullah University of Science and Technology (KAUST), Physical Science and Engineering Division (PSE), Thuwal 23955-6900, Saudi Arabia.
authors.forename: Qingyun
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Beijing Key Lab of Nanophotonics &Ultrafine Optoelectronic Systems and School of Physics, Beijing Institute of Technology, Beijing 100081, China.
authors.forename: Bingsuo
authors.initials: B
authors.lastname: Zou
authors.affiliation: King Abdullah University of Science and Technology (KAUST), Physical Science and Engineering Division (PSE), Thuwal 23955-6900, Saudi Arabia.
authors.forename: Udo
authors.initials: U
authors.lastname: Schwingenschlogl