Open AccessPolarization independent integrated filter based on a cross-slot waveguide
Author(s) -
Matthieu Roussey,
Pauline Stenberg,
Arijit Bera,
Paul Sauseng,
Jani Tervo,
Markku Kuittinen,
Seppo Honkanen
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.024149
Subject(s) - optics , polarization (electrochemistry) , waveguide , optical filter , grating , fiber bragg grating , fourier transform , filter (signal processing) , materials science , band pass filter , optoelectronics , physics , optical fiber , computer science , chemistry , quantum mechanics , computer vision
We investigate an in-line band pass filter, working both for TE and TM polarizations, based on a cross-slot waveguide merged with a Bragg grating and an optical cavity. Different types of cavities (C₂- and C₄-symmetric) are presented in order to optimize the filtering and make the device dependent or independent on the polarization. We show a strong light confinement in an extremely small volume, which offers an advantage for further sensing applications. Moreover, we show how the inclusion of a silicon nanowire in the cavity helps the guiding and increases the amplitude of the resonance. In this study we make use of both the Fourier Modal Method and the Finite Difference Time Domain method to perform the numerical simulations.