High-efficiency grating-couplers: demonstration of a new design strategy

We present a simple and practical strategy that allows to design high-efficiency grating couplers. The technique is based on the simultaneous apodization of two structural parameters: the grating period and the fill-factor, along with the optimization of the grating coupler etching depth. Considerin...

Descripción completa

Detalles Bibliográficos
Autores principales: Marchetti, Riccardo, Lacava, Cosimo, Khokhar, Ali, Chen, Xia, Cristiani, Ilaria, Richardson, David J., Reed, Graham T., Petropoulos, Periklis, Minzioni, Paolo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5709428/
https://www.ncbi.nlm.nih.gov/pubmed/29192215
http://dx.doi.org/10.1038/s41598-017-16505-z
Descripción
Sumario:We present a simple and practical strategy that allows to design high-efficiency grating couplers. The technique is based on the simultaneous apodization of two structural parameters: the grating period and the fill-factor, along with the optimization of the grating coupler etching depth. Considering a 260 nm Si-thick Silicon-on-insulator platform, we numerically demonstrated a coupling efficiency of −0.8 dB (83%), well matching the experimental value of −0.9 dB (81%). Thanks to the optimized design, these results represent the best performance ever reported in the literature for SOI structures without the use of any back-reflector.

Ejemplares similares