Journal: Scientific Reports

Article Title: Optical push broom effect by a moving refractive index front in a silicon Bragg waveguide

doi: 10.1038/s41598-026-36302-x

Figure Lengend Snippet: Schematic of the initial design of SBGW. ( a ) Top view of the Bragg grating. ( b ) Side view. The silicon slab height and width are 220 nm and 500 nm, respectively. The height, width ( \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${W}_{\mathrm{wing}}$$\end{document} ), and the thickness \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${T}_{\mathrm{wing}}$$\end{document} of the silicon wings are 220 nm, 220 nm and 150 nm, respectively. The air gap between the silicon waveguide and the wings is \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${W}_{\mathrm{air}}=40 \mathrm{nm}$$\end{document} , and the lattice constant \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\mathrm{a}$$\end{document} is 330 nm. ( c ) The band diagram with two hyperbolic band, simulated from the listed parameters by CST eigenmode solver. Orange and red circles indicate the proposed pump and signal frequencies, respectively.

Article Snippet: Figure c presents the simulated band diagram using the CST eigenmode solver.

Techniques: