Tunable Electromagnetically Induced Transparency in Plasmonic System and Its Application in Nanosensor and Spectral Splitting

A compact structure is proposed to achieve electromagnetically induced transparency (EIT) response, which consists of a side-coupled cavity and a ring resonator. Novel structures and the transmission characteristics are studied in several different situations. The plasmonic device can be used as a high-sensitivity refractive sensor with a sensitivity of 1200 nm/RIU. In addition, multi-EIT-like peaks appear in the original broadband spectrum by adding another side-coupled cavity or ring resonator, and the physical mechanism is presented. The system paves a new way toward highly integrated optical circuits and networks, particularly for nanosensor, spectral splitter, and nonlinear devices.