Fabrication of chiral channel in three-dimensional photonic crystal using projection microstereolithography

Abstract

Backscattering-immune propagation is one of the unique characteristics in topological photonic crystals. Such functionality can be realized by constructing a three-dimensional chiral channel in photonic crystals, of which the fabrication process cannot be compatible to complementary metal-oxide-semiconductor lithography. Here, we employed projection microstereolithography to fabricate a three-dimensional chiral channel surrounding in a photonic crystal template with the lattice constant of 462 μm. Both projected band structure and Poynting vector patterns of the three-dimensional chiral channel are numerically calculated. Our work provides a feasible way to fabricate a backscattering-immune waveguide in three-dimensional photonic crystals.