Plasmon-induced transparency in the plasmonic nanostructures composed of C-shaped metal and ellipsoid strip

• The plasmon properties supported by bright and dark resonators were investigated.
• The PIT effect is associated with the destructive interference.
• The bright–dark–bright resonators obtained more prominent transparency windows.
• The transmission spectra can be tuned by structural parameters.
• The electric and magnetic field distributions are discussed.

We investigate numerically the plasmon properties supported by bright–dark resonators and bright–dark–bright resonators composed of C-shaped metal and metallic ellipsoid strip by using the finite difference time domain (FDTD) method. The plasmon-induced transparency (PIT) effect in the nanosystem is associated with the destructive interference between the dark and bright modes. In comparison, bright–dark–bright resonators obtained more prominent transparency windows than bright–dark resonators. And it is found that the transmission spectra of the nanostructures can be tuned by structural parameters of inner radius of the C-shaped resonator, the short-axis of the ellipsoid gold strip and the distance between the resonators. The electric and magnetic field distributions of certain resonance wavelengths are given to discuss the underlying physics.