Abstract
We investigate a classic optical effect based on plasmon induced transparency (PIT) in a metal-insulator-metal (MIM) bus waveguide coupled with a single defective cavity. With the coupled mode theory (CMT), a theoretical model, for the single defective cavity, is established to study spectral features in the plasmonic waveguide. We can achieve a required description for the phenomenon, and the theoretical results also agree well with the finite-difference time-domain (FDTD) method. Our researches show that the defect’s position and size play important roles in the PIT phenomenon. By adjusting the position and size of the defect, we can realize the PIT phenomenon well and get the required slow light effect. The proposed model and findings may provide guidance for fundamental research of the control of light in highly integrated optical circuits.
Highlights
Induced transparency (EIT) occurs in atomic systems is attributed to the quantum interference between the excitation pathways to the atomic upper levels[1,2]
We investigate the plasmon induced transparency (PIT) transmission and slow-light effect in the plasmonic resonator system, which consists of a MIM bus waveguide coupled with a single defective cavity
As the SPP waves pass through the bus waveguide, the energy can be coupled into the cavity and the dynamic transmission characteristics of the proposed structure can be investigated by the CMT22,23
Summary
Induced transparency (EIT) occurs in atomic systems is attributed to the quantum interference between the excitation pathways to the atomic upper levels[1,2]. Theoretical analysis and experimental results show that a novel phenomenon analogous to EIT can occur in dielectric photonic resonator systems, which is known as the plasmon induced transparency (PIT)[7,8,9,10]. In view of the unique features of MIM waveguides, the PIT observed in nanoscale plasmonic resonator systems has been theoretically predicted and experimentally illustrated in recent researches[15,16,17,18,19,20]. We investigate the PIT transmission and slow-light effect in the plasmonic resonator system, which consists of a MIM bus waveguide coupled with a single defective cavity. As the SPP waves pass through the bus waveguide, the energy can be coupled into the cavity and the dynamic transmission characteristics of the proposed structure can be investigated by the CMT22,23.
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