Abstract
A GaAs/AlO
$_x$
high contrast grating structure
design which exhibits a 99.5% high reflectivity for a 425 nm large bandwidth is reported. The high
contrast grating (HCG) structure has been designed in order to enhance the properties of mid-infrared VCSEL devices by
replacing the top Bragg mirror of the cavity. A robust optimization algorithm has been implemented to design the HCG
structure not only as an efficient mirror but also as a robust structure against the imperfections of fabrication. The
design method presented here can be easily adapted for other HCG applications at different wavelengths.
© 2013 IEEE
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