Department of Electrical and Electronic Engineering, The University of Melbourne, Parkville, VIC 3010, Australia
CSIRO (Commonwealth Scientific and Industrial Research Organisation), 343 Royal Parade, Parkville, VIC 3052, Australia
School of Engineering, Monash University Malaysia, 47500 Bandar Sunway, Selangor, Malaysia
: Received: 4 August 2016 / Approved: 4 August 2016 / Online: 4 August 2016 (12:00:43 CEST)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
How to cite:
Asaduzzaman, M.; Bakaul, M.; Skafidas, S.; Khandokar, M. Multiple Layers of Silicon-Silica (Si-SiO2) Pair onto Silicon Substrate towards Highly Efficient, Wideband Silicon Photonic Grating Coupler. Preprints2016, 2016080044 (doi: 10.20944/preprints201608.0044.v1).
Asaduzzaman, M.; Bakaul, M.; Skafidas, S.; Khandokar, M. Multiple Layers of Silicon-Silica (Si-SiO2) Pair onto Silicon Substrate towards Highly Efficient, Wideband Silicon Photonic Grating Coupler. Preprints 2016, 2016080044 (doi: 10.20944/preprints201608.0044.v1).
A single mode waveguide grating coupler based on multiple Si-SiO2 pairs onto Si substrate has been designed. Numerical analysis has been carried out to calculate optimum thickness of the layers of Si-SiO2 that ensures the constructive interference between reflected waves and actual guided wave for high coupling efficiency. Based on the results, an optimal design is developed and modeled by using a 2-D finite difference time domain (2-D FDTD) simulator that dictates a coupling efficiency of as much as 78% (-1.07 dB) at the wavelength of 1550 nm, and a 1-dB bandwidth of 77 nm. The numerical method will be useful to calculate the optimum thicknesses of the layers for any reflector based grating coupler of different materials.