一种硅基金属狭缝表面等离子体波导的设计

Abstract

A type of surface plasmonic waveguide applied in the optoelectronic integrated circuit was designed.It was simulated by using three dimensional full-vectorial finite-difference time-domain method.The dependence of distributions of electromagnetic field,effective index and propagation length of the fundamental mode supported by this waveguide on geometrical parameters were presented.The coupling length,maximum transfer power and crosstalk between two waveguide structures were studied.The simulation results showed:the light field is highly confined to the core layer area,and the energy restriction factor of light field is higher when the metal structure apex angle is 135degrees;at a given metal,the effective index will decrease as the core width of ridge increases,meanwhile the propagation length of the fundamental mode will increase as radius of ridge increases;as the waveguide distance increases under given core width,the coupling length between two waveguide structures will increase and the maximum transfer power and crosstalk will decrease.