Conformal CVD-Grown MoS 2 on Three-Dimensional Woodpile Photonic Crystals for Photonic Bandgap Engineering.

To achieve the modification of photonic band structures and realize the dispersion control toward functional photonic devices, composites of photonic crystal templates with high-refractive-index material are fabricated. A two-step process is used: 3D polymeric woodpile templates are fabricated by a direct laser writing method followed by chemical vapor deposition of MoS 2 . We observed red-shifts of partial bandgaps at the near-infrared region when the thickness of deposited MoS 2 films increases. A ∼10 nm red-shift of fundamental and high-order bandgap is measured after each 1 nm MoS 2 thin film deposition and confirmed by simulations and optical measurements using an angle-resolved Fourier imaging spectroscopy system.