Abstract
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 –0.456 ps, 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.
Highlights
Induced absorption (EIA) appeared first as a quantum mechanical phenomenon in atomic media, where the absorption of a laser beam increased significantly but only for a narrow frequency band [1, 2]
Photonic Sensors (A) spectra were investigated by using finite element method (FEM) with a perfectly matched layer (PML) boundary condition
A distinct plasmonicinduced absorption (PIA) window appears around the transmission peak of the device without an adjustable rectangular cavity
Summary
Xinyi LI et al.: Enhanced Plasmonic-Induced Absorption Using a Cascade Scheme and Its Application as Refractive-Index. The perfect PIA effect with fast-light performance was observed in this device. The PIA response in this device was studied and confirmed by using the coupled-mode theory [13] and the finite-difference time-domain (FDTD) method [14]. We first design a simple plasmonic device on a nanoscale. It consists of a dual-rectangular cavity system coupled to MIM bus waveguides. We describe a cascade-based scheme to improve the fast-light performance for PIA. This study opens a new door for the development of ultracompact high-performance fast-light devices in high-speed optical communication networks [16, 17]
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