Tunable group velocity reduction in coupled-resonator optical waveguide (CROW)

Summary form only given. We recently proposed a new type of waveguide, the coupled-resonator optical waveguide (CROW), where an array of high Q resonators are coupled together. Under the tight-binding approximation, we found that the dispersion relation of a CROW can described by a coupling coefficient K and that its group velocity is greatly reduced. However, the concept of CROW is not necessarily limited by the tight-binding approximation. Here we propose a novel CROW structure by coupling a series of resonators with a waveguide.