Open AccessWeakly modulated silicon-dioxide-cladding gratings for silicon waveguide Fabry-Pérot cavities
Author(s) -
Richard R. Grote,
Jeffrey B. Driscoll,
Claudiu G. Biris,
Nicolae C. Panoiu,
Richard M. Osgood
Publication year - 2011
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.026406
Subject(s) - materials science , optics , cladding (metalworking) , refractive index , fabry–pérot interferometer , silicon , distributed bragg reflector , silicon on insulator , coupled mode theory , coupling coefficient of resonators , fiber bragg grating , optoelectronics , waveguide , transmission coefficient , wavelength , resonator , transmission (telecommunications) , physics , electrical engineering , metallurgy , engineering
We show by theory and experiment that silicon-dioxide-cladding gratings for Fabry-Pérot cavities on silicon-on-insulator channel ("wire") waveguides provide a low-refractive-index perturbation, which is required for several important integrated photonics components. The underlying refractive index perturbation of these gratings is significantly weaker than that of analogous silicon gratings, leading to finer control of the coupling coefficient κ. Our Fabry-Pérot cavities are designed using the transfer-matrix method (TMM) in conjunction with the finite element method (FEM) for calculating the effective index of each waveguide section. Device parameters such as coupling coefficient, κ, Bragg mirror stop band, Bragg mirror reflectivity, and quality factor Q are examined via TMM modeling. Devices are fabricated with representative values of distributed Bragg reflector lengths, cavity lengths, and propagation losses. The measured transmission spectra show excellent agreement with the FEM/TMM calculations.