Enhanced Plasmonic-Induced Absorption Using a Cascade Scheme and Its Application as Refractive-Index Sensor

• 来源期刊: 光子传感器（英文版）
• 关键词: Plasmonic-induced absorption fast light metal-insulator-metal waveguide finite element method
• 年，卷（期）: 2020,（2）
• 页码范围: 162-170
• 页数: 9页
• 语种: 英文
• DOI: 10.1007/s13320-019-0561-x

摘要

In this paper,we describe a new method to improve fast-light transmission,which uses cascades.We design a simple plasmonic device that enables plasmonic-induced absorption (PIA).It consists mainly of two parallel rectangular cavities.The numerical results simulated by using the finite element method (FEM) confirm its function.The corresponding group delay-time can reach -0.146 ps for the PIA window.Based on this result,we propose a cascade device,with the dual-rectangular cavity system as building block,to improve fast-light transmission even more.The results indicate that the cascade scheme can increase the group delay-time to-0.456ps,which means the fast-light feature is substantially enhanced compared with the non-cascading approach.The effect of the distance between two cascade resonators and other structural parameters is also investigated.Finally,we use this design concept to build a refractive-index sensor with a sensitivity of 701 nm/RIU.