Title :
Three-Dimensional Chirped High-Contrast Grating Hollow-Core Waveguide
Author :
Yue, Yang ; Zhang, Lin ; Wang, Xue ; Huang, Hao ; Yang, Weijian ; Ferrara, James ; Karagodsky, Vadim ; Chase, Christopher ; Tur, Moshe ; Chang-Hasnain, Connie J. ; Willner, Alan E.
Author_Institution :
Dept. of Electr. Eng., Univ. of Southern California, Los Angeles, CA, USA
Abstract :
A 3-D chirped high-contrast grating hollow-core waveguide (HCG-HW) exhibits highly efficient 2-D (transverse and lateral) light confinement. Compared with step-index ones, laterally chirped HCG-HWs (graded index) can pronouncedly reduce the propagation loss (>; 10×) without compromising the lateral index contrast. Simulation results show that a propagation loss as low as 0.04 dB/cm can be achieved. For a chirped HCG-HW with a 6-μm core height, it exhibits 30and 141-nm spectral widths for 0.1and 1-dB/cm loss requirements. The chirped HCG-HW also shows an ultralow nonlinear coefficient, which is on the order of 10-5 /W/m.
Keywords :
diffraction gratings; gradient index optics; light propagation; nonlinear optics; optical losses; optical waveguides; spectral line breadth; 2D light confinement; core height; graded index optics; lateral index contrast; lateral light confinement; laterally chirped 3D HCG-HW; propagation loss; spectral widths; three-dimensional chirped high-contrast grating hollow-core waveguide; transverse light confinement; ultralow nonlinear coefficient; wavelength 141 nm; wavelength 30 nm; Chirp; Gratings; Indexes; Optical waveguides; Propagation losses; Reflectivity; Silicon; Waveguides; engineered photonic nanostructures; gratings; optics; subwavelength structures;
Journal_Title :
Photonics Journal, IEEE
DOI :
10.1109/JPHOT.2012.2210279
