This work was supported by the National Natural Science Foundation of China (Grant No. 11144007) and the Natural Science Foundation of Shandong Province (Grant No. ZR2016AM27).
Slow light with high group index and wideband is achieved in photonic crystal coupled-resonator optical waveguides (PC-CROWs). According to the eye-shaped scatterers and various microcavities, saddle- like curves be...