A two-layer guide-mode resonance structure made of shallow gratings deposited on the Kerr active guiding layer is used to realize high-quality Fano resonance and step-like transmission. The step-like transmission is designed to work between the perfect transmission peak and the dip of the asymmetrical Fano spectrum. It is demonstrated that the steep transition in the transmission should be attributed to the strong field localization in cases of both high and low transmission states.
© 2013 Optical Society of America
Original Manuscript: October 24, 2012
Revised Manuscript: January 17, 2013
Manuscript Accepted: January 28, 2013
Published: February 25, 2013
Xiu-Bao Kang, Hai-Dong Li, Jun Ding, and Zhi-Guo Wang, "Fano resonance and step-like transmission via guide-mode resonance structure," Opt. Lett. 38, 715-717 (2013)