High efficiency of graded index photonic crystal as an input coupler

A graded index photonic crystal (GRIN PC) configuration was placed at the input side of a photonic crystal waveguide (PCW) in order to efficiently couple the light waves into the waveguide. We compared the transmission efficiencies of light in the absence and presence of the GRIN PC structure. We report a significant improvement in coupling when the GRIN PC is incorporated with the PCW. The intensity profiles were obtained by carrying out the experiments at microwave frequencies. Finite difference time domain based simulations were found to be in good agreement with our experimental results.
European UnionEuropean Commission; EU-PHOME; EU-ECONAM; TUBITAKTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [105A005, 106E198, 107A004]; Turkish Academy of SciencesTurkish Academy of Sciences
This work is supported by the European Union under the projects EU-PHOME, and EU-ECONAM, and TUBITAK under Project Nos. 105A005, 106E198, and 107A004. One of the authors, E.O., also acknowledges partial support from the Turkish Academy of Sciences.