MA Pingping, ZHANG Jie, LIU Huanhuan, ZHANG Jing,XU Yonggang, WANG Jiang, ZHANG Mengqiao, LI Yongfang*
（School of Physics and Information Technology, Shaanxi Normal University,Xi′an 710119, Shaanxi, China）
Abstract:
Based on nanostripe trimer, the physical mechanism of plasmon induced transparency (PIT) is investigated by finite element methed(FEM). It has been discovered that the absorption of the trimer shows tunable property as a function of symmetry. The PIT of trimer originates from the coupling between the vertical stripe and parallel double stripes, and depends on the symmetry of parallel double stripes. The dipole bright mode is split under the action of dark mode of parallel double stripes. In this system, the PIT stems from the coherent superposition between split modes of dipole bright mode of the vertical stripe. Plasmon induced transparency window can be adjusted by changing symmetry of parallel double stripes, which contribute to design optical switching, slow light device.
KeyWords:
nano trimer; plasmon induced transparency; asymmetrical
