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[Springer Series in Optical Sciences] Fano Resonances in Optics and Microwaves Volume 219 (Physics and Applications) || Multiple-Resonance Interference in Metallic Nanohole Arrays
摘要： In metallic nanohole arrays, the surface plasmon polaritons on the metal surfaces and the waveguide modes in the nanoholes are combined to form multipole surface plasmons. If these surface bound modes appear in a narrow frequency range, interference between multiple resonances and yields various resonant peak-dip structures in transmission, reflection and absorption spectra. In this chapter, we discuss the theoretical details of the mechanism of the multiple-resonance interference in metallic nanohole array systems using spatial and temporal coupled mode methods.
关键词： Fano resonance,surface plasmon polaritons,metallic nanohole arrays,waveguide modes,multiple-resonance interference,EIT-like phenomena
更新于2025-09-10 09:29:36
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Influence of Interaction Retardation and Radiation Reaction on the Fano Resonance Efficiency in the System of Nanoparticles
摘要： The system of metallic nanospheroids in the field of monochromatic light wave under conditions of manifestation of the Fano resonance is considered. The dimensions of the nanospheroids are much smaller than the wavelength of the incident radiation, but distances between them can be arbitrary. An analysis is made of the influence of the interparticle interaction and the reaction field on the inhomogeneity of the energy distribution of the collective oscillations of electrons in the system (the Fano resonance efficiency). It is shown that both the retardation and the reaction field contribute to an increase in the resonance efficiency.
关键词： nanoparticle,radiation,the Fano resonance
更新于2025-09-10 09:29:36
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[Springer Series in Optical Sciences] Fano Resonances in Optics and Microwaves Volume 219 (Physics and Applications) || Mueller Matrix Approach for Engineering Asymmetric Fano-resonance Line Shape in Anisotropic Optical System
摘要： The Fano resonances observed in diverse micro and nano optical systems have received particular attention due to their numerous potential applications like sensing, switching, lasing, ?lters and robust color display, nonlinear and slow-light devices, invisibility cloaking, and so forth. For most of these applications, it is highly desirable that the asymmetric spectral line shape of Fano resonance can be controlled or modulated by some experimentally accessible parameters. In this chapter, we discuss a new concept based on polarization Mueller matrix analysis for tuning the Fano interference effect and the resulting asymmetric spectral line shape in anisotropic optical system. The approach is founded on a generalized model of anisotropic Fano resonance and exploits the differential polarization response (anisotropy) of the two interfering modes to achieve unprecedented control over Fano resonance. Illustrative results on the use of the model for tuning Fano resonance in coupled plasmonic systems are presented. In this context, the fundamentals of polarized light, the mathematical framework of Stokes-Mueller formalism and the basic polarimetry parameters encoded in Mueller matrix are discussed. The speci?cs of a novel dark ?eld Mueller matrix spectroscopy system and its use for studying the polarization response of Fano resonance in plasmonic systems is illustrated with selected examples. The chapter concludes with an outlook on the prospects of the polarization-optimized anisotropic Fano resonant systems for applications involving control and manipulation of electromagnetic waves at the nano scale.
关键词： plasmonic systems,anisotropic optical system,Fano resonance,Mueller matrix,polarization control
更新于2025-09-09 09:28:46
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[Springer Series in Optical Sciences] Fano Resonances in Optics and Microwaves Volume 219 (Physics and Applications) || Fano Resonance Generation and Applications in 3D Folding Metamaterials
摘要： The development of nanotechnology has endowed the light-matter interaction with more degrees of freedom, and made the manipulation of optical phenomena more precise and arbitrary. Fano resonance is a type of resonant scattering phenomenon with asymmetric line profile, which was firstly studied in atomic physics and then introduced to photonics and plasmonics. This phenomenon is due to the interference between a discrete bound state and a continuum state, thus a two-body or few-body system is needed to provide different types of states that are necessary in this phenomenon. Artificial metamaterial is a very good candidate to generate Fano resonances because of its designable configuration. In this paper, a new type of structure—3D folding metamaterial—is introduced for Fano resonance generation and application. The structure, fabricated by focused-ion-beam based folding technique, is composed of planar and out-of-plane parts, which are essential for the excitation of the discrete bound states and continuum states. The intensity, frequency and quality factor of the Fano resonances can be modulated by the configuration of the 3D folding structures (shape, size, inclined angle, etc.), thus enlarges its application potential such as index sensing and surface enhanced Raman scattering.
关键词： 3D folding metamaterial,nanotechnology,Fano resonance,surface enhanced Raman scattering,light-matter interaction
更新于2025-09-09 09:28:46
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Resonance || Fano Resonance in High-Permittivity Objects
摘要： In this chapter, Fano resonances in simple structures with high permittivity such as spheres or core-shell particles are analyzed by Mie theory. The Mie scattering coefficients can be decomposed into slow varying backgrounds and narrow resonances, which cause the Fano resonances in scattered field. For structures of arbitrary shapes, temporal coupled-mode theory is applied to explain the Fano resonances found in the scattering cross section. At last, we analyze the periodic structures by using band diagram, and it shows that the Fano resonances can be viewed as the superposition of the Bloch wave and the Mie scattering wave.
关键词： sensor,temporal coupled-mode theory,Mie theory,Fano resonance,photonic crystal
更新于2025-09-09 09:28:46
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Multiple Fano Resonance Based Optical Refractive Index Sensor Composed Of Micro-Cavity and Micro-Structure
摘要： A multiple Fano resonance based optical refractive index sensor composed of micro-cavity and micro-structure is designed. The multiple Fano resonances, generated by the interference between the multiple resonant peaks produced by the micro-cavity and the continuous background produced by the micro-structure, can reach high sensitivity in refractive index measurement. Besides, the micro-cavity con?guration obviously reduces the energy loss, thus effectively increasing the ?gure of merit. Adjusted by the micro-cavity thickness and the micro-structure con?guration, multiple Fano resonances can be generated potential for refractive index sensing: the sensitivity of 831 nm/RIU and the ?gure of merit of ～600 can be reached according to a single Fano resonance; moreover, spectral interval between double Fano resonances can also be used for refractive index sensing with the sensitivity of 194 nm/RIU but signi?cantly reducing the error due to the environmental changes. Considering the advantages as high sensitivity, narrow Fano resonant peak, high ?gure of merit and ease of integration, as well as its potential in environmental error reduction, the proposed multiple Fano resonance based optical refractive index sensor is expected to provide new tactics for optical refractive index sensing.
关键词： Refractive index sensor,micro-structures,micro-cavity,multiple Fano resonance
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO) - Hangzhou, China (2018.8.13-2018.8.17)] 2018 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO) - Sensing Characteristics of Fano Resonance in Y-shaped Gold Nanorods Array
摘要： Fano resonance of metallic nanostructure is good for reducing the irradiation loss. Fano resonance of metallic nanostructure is also could improve the spectral resolution. Due to its unique sensitivity, Fano resonance is widely used in physics and engineering fields such as optical sensors, optical switches transparent resonators. In this paper, time-domain finite difference method is used to design a kind of Y-type gold periodic nanorods array, which has obvious Fano resonance phenomenon at 1.12-(cid:541)m wavelength. When the array structural parameters change, the Fano resonance valley has a dramatic movement. The Y-type gold nanoarray structures have better sensing characteristics, and its figure of merit is 10.68. It shows the special nanoarray can be used for infrared sensors.
关键词： finite difference time domain,Fano resonance,localized surface plasmon resonance
更新于2025-09-04 15:30:14
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Fano resonance between coherent acoustic phonon oscillations and electronic states near the bandgap of photoexcited GaAs
摘要： Impulsive photo-excitation of solids results in a travelling strain pulse which manifests itself as coherent acoustic phonon oscillations. These oscillations have been extensively studied using time-resolved pump-probe spectroscopy. In the present work, we report the generation of extremely long-lived, coherent longitudinal acoustic phonon oscillations in intrinsic GaAs (100), with clear and unambiguous evidence of Fano interference between these oscillations and the continuum of electronic states close to the bandgap. Fano resonance is a widespread phenomenon observed in atomic systems and condensed media that arises from quantum interference between a continuum of quantum states and a discrete quantum state. Among other techniques, Fano resonance has been investigated with respect to optical phonons studied with Raman Spectroscopy. In the present work, we investigate Fano resonance in coherent phonon oscillations generated without the aid of any capping layer, dopants or substrate/interface effects. Since Fano resonance is sensitive to changes in electronic structure, doping and defects, these observations are important to the field of picosecond ultrasonics which is used for non-destructive depth profiling of solids and for carrier diffusion studies.
关键词： GaAs,coherent acoustic phonon oscillations,Fano resonance,quantum interference,pump-probe spectroscopy
更新于2025-09-04 15:30:14
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Surface Plasmon Resonance in a metallic nanoparticle embedded in a semiconductor matrix: exciton-plasmon coupling
摘要： We consider the effect of electromagnetic coupling between localized surface plasmons in a metallic nanoparticle (NP) and excitons or weakly interacting electron-hole pairs in a semiconductor matrix where the NP is embedded. An expression is derived for the NP polarizability renormalized by this coupling and two possible situations are analyzed, both compatable with the conditions for Fano-type resonances: (i) a narrow bound exciton transition overlapping with the NP surface plasmon resonance (SPR), and (ii) SPR overlapping with a parabolic absorption band due to electron-hole transitions in the semiconductor. The absorption band lineshape is strongly non-Lorentzian in both cases and similar to the typical Fano spectrum in the case (i). However, it looks differently in the situation (ii) that takes place for gold NPs embedded in a CuO film and the use of the renormalized polarizability derived in this work permits to obtain a very good fit to the experimentally measured LSPR lineshape.
关键词： Localized surface plasmon,Nanoparticle,Semiconductor,Dielectric function,Composite,Fano resonance,Exciton
更新于2025-09-04 15:30:14
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Controlling steady-state second harmonic signal via linear and nonlinear Fano resonances
摘要： Nonlinear signal even from a single molecule becomes visible at hot spots of plasmonic nanoparticles. In these structures, Fano resonances can control the nonlinear response in two ways. (i) A linear Fano resonance can enhance the hot spot field, resulting enhanced nonlinear signal. (ii) A nonlinear Fano resonance can enhance the nonlinear signal without enhancing the hot spot. In this study, we compare the enhancement of second harmonic signal at the steady-state obtained via these two methods. Since we are interested in the steady-state signal, we adapt a linear enhancement which works at the steady-state. This is different than the dark-hot resonances that appear in the transparency window due to enhanced plasmon lifetime.
关键词： Fano resonance,nonlinear optics,Quantum plasmonics
更新于2025-09-04 15:30:14