Regular Article

Plasmon induced transparency like transmission properties in compact MIM waveguide side-coupled with U-cavity

¹ School of Physics & Electronics Engineering, Shanxi University, Taiyuan 030006, P.R. China
² Computer Center, School of Modern Educational Technology, Shanxi University, Taiyuan 030006, P.R. China
³ State Key Laboratory of Integrated Optoelectronics, Institute of Semiconductors, CAS, Beijing 100083, P.R. China

^a e-mail: tianjp@sxu.edu.cn

Received: 26 April 2019
Received in final form: 3 August 2019
Published online: 15 November 2019

Abstract

Surface plasmon polaritons (SPPs) can overcome the limitation of diffraction and control light at nanoscale, thus becoming a hotspot in recent years. SPPs based metal-insulator-metal (MIM) plasmonic waveguides using U-cavity and slot cavity are designed. The transmission characteristics are numerically simulated and verified by the coupled mode theory (CMT). Meanwhile, the effects of changing the geometric parameters on the transmission characteristics are also studied. Single and double plasmon induced transparency (PIT) effects are realized through the coupling and the destructive interfering between the transmission paths. Furthermore, characteristics of the refractive index sensing as well as the slow light and fast light effects are also investigated. We hope the designed waveguide structures along with their transmission characteristics have potential application prospects in the area of nanoscale integrated optical devices, such as filters, sensors, switches, slow/fast light devices, and other optoelectronic circuits.