title: Mechanism of the large polarization rotation effect in the all-dielectric artificially chiral nanogratings.
abstract: The physical mechanism of the large polarization rotation effect in direct transmission of the all-dielectric artificially chiral nanogratings is explored by experiment and numerical analysis. It is shown that the different coupling of right- and left-circularly polarized components of the normally incident light to the leaky guided modes or Fabry-Pérot resonance modes lead to the enhanced circular dichroism, resulting in the giant polarization rotation effect. The mode profile and local field calculations demonstrate intuitive images of the different coupling performance at resonances.
authors.affiliation: Department of Physics and Mathematics, University of Joensuu, P.O. Box 111, FI-80101 Joensuu, Finland. bai@joyx.joensuu.fi
authors.forename: Benfeng
authors.initials: B
authors.lastname: Bai
authors.forename: Kuniaki
authors.initials: K
authors.lastname: Konishi
authors.forename: Xiangfeng
authors.initials: X
authors.lastname: Meng
authors.forename: Petri
authors.initials: P
authors.lastname: Karvinen
authors.forename: Anni
authors.initials: A
authors.lastname: Lehmuskero
authors.forename: Makoto
authors.initials: M
authors.lastname: Kuwata-Gonokami
authors.forename: Yuri
authors.initials: Y
authors.lastname: Svirko
authors.forename: Jari
authors.initials: J
authors.lastname: Turunen