Open AccessMechanism of the large polarization rotation effect in the all-dielectric artificially chiral nanogratings
Author(s) -
Benfeng Bai,
Kuniaki Konishi,
Xiangfeng Meng,
Petri Karvinen,
Anni Lehmuskero,
Makoto KuwataGonokami,
Yuri Svirko,
Jari Turunen
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.000688
Subject(s) - optics , optical rotation , polarization (electrochemistry) , dielectric , circular polarization , rotation (mathematics) , circular dichroism , guided mode resonance , physics , polarization rotator , dichroism , materials science , optoelectronics , birefringence , grating , diffraction grating , geometry , chemistry , crystallography , microstrip , mathematics
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.