title: Proposal of a polarization-insensitive echelle grating demultiplexer based on a nanophotonic silicon-on-insulator platform through a dual-grating system.
abstract: In this Letter, we demonstrate theoretically the design of a polarization-insensitive echelle grating demultiplexer on a nanophotonic silicon-on-insulator platform. The polarization-insensitive performance is achieved through a dual-grating system, which utilizes different concave gratings for different polarizations. The first concave grating acts as a polarization to beam splitter as well, allowing light with the other polarization to pass through and be reflected by the second grating, which is designed separately; thus the same spectral responses are obtained for the two polarizations.
authors.affiliation: Key Laboratory of Electroluminescent Devices, Department of Education of Guangdong Province, China Institute of Optoelectronic Material and Technology, South China Normal University, Guangzhou 510631, China. ningz@kth.se
authors.forename: Ning
authors.initials: N
authors.lastname: Zhu