Open AccessLight focusing by the unique dielectric nano-waveguide array
Author(s) -
Ling Zhao,
Yudong Li,
Jiwei Qi,
Jingjun Xu,
Quan Sun
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.17.017136
Subject(s) - optics , finite difference time domain method , wavelength , waveguide , dielectric , materials science , radiation , ray , radiation mode , optoelectronics , single mode optical fiber , physics , optical fiber
The light focusing by using dielectric nano-waveguides array with its length in micron is investigated via the finite-difference time domain (FDTD) method. Simulated results show that the focal length depends on the length and the total width of the arrays and can be altered from tens of micron to wavelength order. Both TM and TE mode incident light can be focused by the array. The wavelength-order focal length is achieved by employing the dielectric nano-waveguide array with variant separations. The unique focusing behavior is contributed to the radiation mode with longer decay length and the large evanescent field which appears in the nano-waveguide array. We believe this simulation results can be a promising guidance for the experiments.