Control of delay-bandwidth product in slow-light photonic crystal waveguides with asymmetric microfluidic infiltration

In this work, we report on the optofluidic tuning of the delay bandwidth product of a slow-light photonic crystal waveguide. The proposed tuning method is obtained by infiltrating the central two rows of the W09 waveguide. These infiltrated rows consist of holes that are infiltrated asymmetrically by different liquids with different refractive indices. The simulation results show that by changing the refractive index of the infiltrated liquids, we can achieve a very flat band corresponding with low group velocity and dispersion. It is found that the values of the bandwidth and group index-the bandwidth product of the proposed waveguide-can be improved by changing the refractive index of the infiltrated liquid. This approach allows us to control the group velocity, dispersion and delay bandwidth product of the slow-light photonic crystal waveguide by choosing a suitable refractive index of the two infiltrated liquids.