Send to

Choose Destination
Opt Lett. 2010 Dec 1;35(23):3973-5. doi: 10.1364/OL.35.003973.

Role of propagating modes in a double-groove grating with a +1st-order diffraction angle larger than the substrate-air critical angle.

Author information

Toyota Research Institute, Toyota Motor Engineering & Manufacturing North America, Ann Arbor, Michigan 48105, USA.


Here we show, analytically and numerically, that in a TiO(2) double-groove grating with two different groove widths per period attached on the SiO(2) substrate, the normally incident light couples to the +1st-order transmission with 96.9% efficiency and with a 50° diffraction angle that is larger than the SiO(2)-air interface critical angle. Modal analysis reveals that three propagating modes for the +1st diffraction order reach the grating back end in phase, while the corresponding propagating modes for the -1st and zeroth orders are added destructively at the grating end. Four optical devices based on this grating characteristic are numerically demonstrated.


Supplemental Content

Full text links

Icon for Optical Society of America
Loading ...
Support Center