Analogous plasmon-induced absorption based on an end-coupled MDM structure with area-cost-free cavities

We theoretically investigate an end-coupled metal-dielectric-metal (MDM) structure that achieves analogous plasmon-induced absorption (APIA) in an area-cost-free manner. First, a squared ring is set to end-couple with MDM input and output waveguides, generating three Lorentzian-like peaks in the spectrum. Then, two APIA windows as well as two Fano resonances can be induced via appropriately arranging two area-free cavities. Numerous numerical results demonstrate that the proposed structure has remarkable sensing and phase characteristics. Our proposed PIA-based MDM structure is promising in potential applications of bio-chemical sensing, slow light devices, optical switching, and chip-scale plasmonic devices. (C) 2022 Optica Publishing Group

Automated summary

In this study, we investigate an end-coupled metal-dielectric-metal (MDM) structure that achieves plasmon-induced absorption (APIA) without additional area cost. The proposed structure exhibits remarkable sensing and phase characteristics, showing great potential in applications such as bio-chemical sensing, slow light devices, and optical switching.