title: Robust flow of light in three-dimensional dielectric photonic crystals.
abstract: Chiral defect waveguides and waveguide bend geometry were designed in diamond photonic crystal to mold the flow of light in three dimensions. Propagations of electromagnetic waves in chiral waveguides are robust against isotropic obstacles, which would suppress backscattering in waveguides or integrated devices. Finite-difference time-domain simulations demonstrate that high coupling efficiency through the bend corner is preserved in the polarization gap, as it provides an additional constraint on the polarization state of the backscattered wave. Transport robustness is also demonstrated by inserting two metallic slabs into the waveguide bend.
authors.affiliation: State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University, Guangzhou 510275, China.
authors.forename: Wen-Jie
authors.initials: WJ
authors.lastname: Chen
authors.forename: Shao-Ji
authors.initials: SJ
authors.lastname: Jiang
authors.forename: Jian-Wen
authors.initials: JW
authors.lastname: Dong