the telecommunication C band at around
1550 nm have multi-scale structures that are typically micron-scale waveguides and deep
sub-micron-scale air hole arrays. Several steps of nanolithography and photolithography are
usually used for the fabrication of multi-scale photonic crystals. In this work, we report a
one-step lithography process to pattern both micron and deep sub-micron features
simultaneously for the 2D slab photonic crystal using combined-nanoimprint-andphotolithography.
As a demonstrator, a 2D silicon photonic crystal transverse magnetic
(TM) polarizer was fabricated, and the operation was successfully demonstrated.