One-way optical transmission through a composite structure of grating-photonic crystal (PC) is presented. This unidirectional transportation property originates from the diffraction of grating to change the direction of light incident into the PC from pseudobandgaps to passbands of the PC. Numerical simulation shows that a light beam in a certain range of frequencies can transmit the composite structure when it is incident from the grating interface but is completely reflected by the structure when it is incident from the PC interface, which is further verified experimentally. The present structure may provide another more compact way for designing on-chip optical diode-like integrated devices.
© 2014 Optical Society of America
Diffraction and Gratings
Original Manuscript: May 14, 2014
Revised Manuscript: July 2, 2014
Manuscript Accepted: July 15, 2014
Published: August 15, 2014
Yanyu Zhang, Qiang Kan, and Guo Ping Wang, "One-way optical transmission in silicon grating-photonic crystal structures," Opt. Lett. 39, 4934-4937 (2014)