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.
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Acknowledgment
This work was supported by the National Natural Science Foundation of China (Grant No. 61367007), the Natural Science Fund of Gansu Province of China (Grant Nos. 17JR5RA123 and 17JR5RA132), and the HongLiu First-Class disciplines Development Program of Lanzhou University of Technology.
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Li, X., Wang, D., Wang, S. et al. Enhanced Plasmonic-Induced Absorption Using a Cascade Scheme and Its Application as Refractive-Index Sensor. Photonic Sens 10, 162–170 (2020). https://doi.org/10.1007/s13320-019-0561-x
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DOI: https://doi.org/10.1007/s13320-019-0561-x