Open AccessUnidirectional transmission in non-symmetric gratings made of isotropic material
Author(s) -
Weimin Ye,
Xiaodong Yuan,
Chucai Guo,
Chun Zen
Publication year - 2010
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.18.007590
Subject(s) - optics , isotropy , grating , polarization (electrochemistry) , transmission coefficient , transmission (telecommunications) , diffraction , wideband , diffraction grating , broadband , bandwidth (computing) , physics , extraordinary optical transmission , refractive index , apodization , materials science , telecommunications , computer science , chemistry , plasmon , surface plasmon , surface plasmon polariton
We achieve a broadband unidirectional transmission or One-way diffraction grating by cascading two parallel gratings made of isotropic material with different periods. In order to significantly reduce the reciprocal transmission of the zero order, one of them is chosen to be a subwavelength grating and designed as a wideband reflector for the incident-wave. It is demonstrated that more than 65 percent of the incident-wave energy can be transmitted unidirectionally with less than 0.22 percent transmission in the opposite direction at normal incidence for TE polarization. And, the relative bandwidth of the unidirectional transmission is greater than 10 percent.