Multiple Fano Resonances in Multilayer Thin Film-Coupled Attenuated Total Reflection Configuration
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Multiple Fano Resonances in Multilayer Thin Film-Coupled Attenuated Total Reflection Configuration S. Bao 1 & H. D. Jiang 2 & G. G. Zheng 2 Received: 18 July 2020 / Accepted: 31 August 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Multiple Fano resonances (FRs) and plasmon-induced transparency (PIT) are observed and analyzed in one-dimensional photonic crystals (1D-PhCs) coupled surface plasmon polariton (SPP) structure under the attenuated total reflection (ATR) configuration. Coupling between the excited guided modes of 1D-PhCs and SPP mode leads to Fano type resonances which are confirmed by numerical calculation. Magnetic field distributions at the resonances are also presented to verify the existence of multiple FRs. It is demonstrated that the position and the linewidth of the FRs can be engineered by the structural parameters. Moreover, the position of FRs can be obtained at any desired wavelengths in the near-infrared (NIR) range. These results pave a new way for the development of multiband reflectors working in NIR based on FR. Keywords Fano resonance . Attenuated total reflection . Surface plasmon polariton . Indium tin oxide
Introduction The interaction of freely oscillating electrons on a metallic surface with photons can lead to surface plasmon polaritons (SPPs), which means that the electromagnetic (EM) waves propagate along the surface of a metal-dielectric interface and the exponential evanescent field excited by transverse magnetic (TM) polarized light. SPPs have been extensively investigated for their ability to provide extreme light confinement and strong enhancement [1]. They are broadly applied in light absorption enhancement [2, 3], biological medicine, environmental detection [4–6], telecommunication [7, 8], thermal imaging [9], and heat scavenging [10]. However, the linewidth of surface plasmon resonance (SPR) is broad in conventional configuration which limits its application in optical devices. More attention has been focused on obtaining a narrower linewidth of resonances for a better performance.
* G. G. Zheng [email protected] 1
Department of Electronics Engineering, Nanjing Xiaozhuang University, Nanjing 210017, China
2
Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, School of Physics and Optoelectronic Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
It is well known that coupling between SPP mode and waveguide (WG) mode can generate Fano resonance (FR) [11–13], which was initially observed in a quantum mechanical system [14] and characterized by a sharp asymmetric line shape and rapid variation in phase and amplitude [14–17]. Benefiting from the unique feature of FR, it shows a huge application prospect in detection, sensing, and security monitoring. What is more, the line shape of FR can be engineered to enhance the performance [18, 19]. Current SPR systems usually contain noble metals, as those metals’ associated plasma frequencies located in visible regime. [
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