摘要
We propose a polarization-insensitive and broadband subwavelength grating reflector based on a multilayer structure.The reflector has an overlapped high reflectivity（〉99.5%） bandwidth of 248 nm between the TE and the TM polarizations,which is much higher than the previously reported results.We believe this subwavelength grating reflector can be applied to unpolarized devices.
We propose a polarization-insensitive and broadband subwavelength grating reflector based on a multilayer structure.The reflector has an overlapped high reflectivity（〉99.5%） bandwidth of 248 nm between the TE and the TM polarizations,which is much higher than the previously reported results.We believe this subwavelength grating reflector can be applied to unpolarized devices.
基金
supported by the Chinese National Key Basic Research Special Fund(Nos.2012CB933501 and 2011CB922002)
the National Natural Science Foundation of China(Nos.61025025,61274070,61021003,61234004,61205043,61137003,and 60838003)
the National "863" Program of China(Nos.2012AA012202 and 2013AA030501)
