Optical properties of MIM plasmonic waveguide with an elliptical cavity resonator
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Optical properties of MIM plasmonic waveguide with an elliptical cavity resonator Rida El Haffar1 · Abdelkrim Farkhsi1 · Oussama Mahboub2 Received: 28 December 2019 / Accepted: 21 May 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Metal–insulator–metal waveguide structure, which has a fascinating feature to confine the signal far beyond the diffraction light is numerically investigated by the finite difference time domain and the finite element methods. In this study, the MIM waveguide is both coupled with a half-elliptical groove (HEG) and an elliptical cavity resonator (ECR), and it can support the propagation of light in the nanoscale regime at the visible and near-infrared ranges. The interaction between these last elements gives rise to Fano resonance modes. Thanks to its interesting characteristics, a high sensitivity value, a factor of merit and interesting value of the group index are obtained for the proposed structure. We show that the transmission of the Fano system and the group index can reach 90% and a value of 63, respectively. We also report an investigation of the influence of the both geometrical HEG and ECR’s parameters on optical properties. Hence, the proposed structure could find a potential for applications in the integrated optical circuits such as optical storage, ultrafast plasmonic switchers, high performance filters and slow light devices. Keywords Surface plasmons · Fano resonance · Metal–insulator–metal (MIM) waveguides · Slow light effect · Plasmonic sensors
1 Introduction Surface plasmon polaritons (SPPs) are trapped waves on the surface of metals due to the interaction between free electrons in the metal and the electromagnetic field in the dielectric [1]. Due to the ability of the surface plasmon polaritons (SPPs) to overcome the diffraction limit of the optical waves and to provide on-chip propagation for light, they can be considered as a promising candidate for an integrated plasmonic devices. Fano resonance has been a quantum interference phenomenon which was first explained by Fano in 1961 [2]. It results from interference and coupling between a narrow discrete state, and a broad continuum one has an asymmetrical line shape which is different from the Lorentzian * Oussama Mahboub [email protected] Rida El Haffar [email protected] 1
Department of Physics, Faculty of Sciences, University Abdelmalek Essaadi, Tétouan, Morocco
National School of Applied Sciences, University Abdelmalek Essaadi, Tétouan, Morocco
2
resonance; the Fano resonance exhibits a typical sharp and asymmetric line profile. During the last few decades, Fano resonance in plasmon-based devices has attracted considerable attention due to its application to biological and chemical sensors [3], surface-enhanced Raman scattering (SERS) [4], waveguide modulator [5], plasmonic switch [6], lasing, switching and slow light devices [7, 8]. For its high sensitivity and high figure of merit (FOM), Fano resonance has been widely applied to enhance the plasmonic sensor’s propertie
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