Plasmon hybridization in coated metallic nanowires

Moradi, Afshin

doi:10.1364/josab.29.000625

Cited by 24 publications

(16 citation statements)

References 15 publications

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“…LSPR, the results show that the peak is no-shift and its intensity enhances with increasing the inner gold wire radius, which is agree well with theoretical studies [19], where the LSPR shows no-shift when r 1 /r 2 = constant, r 2 /r 3 = constant and r 1 /r 3 = constant. D. The effect of surrounding medium dielectric function on LSPR of gold-dielectric-silver nanotube…”

Section: B the Effect Of Middle Dielectric Layer Radius On Lspr Of Gsupporting

confidence: 91%

“…ω + − ⟩ mode shows a little blue-shift, its intensity enhances firstly and then reduces. The physical mechanism could be attributed to plasmon hybridization, the coupling of outer nanotube is effected by the ratio of r 2 /r 3 [19]. The coupling is enhanced with increasing the ratio r 2 /r 3 (r 2 /r 3 = 0.28 for r 2 = 7nm and r 2 /r 3 = 0.68 for r 2 = 17nm), and then ω − − ⟩ mode shows a red-shift and ω + − ⟩ mode has a blue-shift.…”

Section: Resultsmentioning

confidence: 99%

“…The plasmon responses of a gold wire with its energy mode |ω s ⟩ could be considered as a constant when the inner gold wire radius is fixed. Thus the LSPR is mainly effected by the outer nanotube (|ω + ⟩ and |ω − ⟩) [19,22,23]. The radius ratios (r 2 /r 3 ) is increased from r 2 /r 3 = 0.67 for r 2 = 10nm to r 2 /r 3 = 0.8 for r 2 = 20nm, and then the coupling of nanotube is enhanced.…”

Section: B the Effect Of Middle Dielectric Layer Radius On Lspr Of Gmentioning

confidence: 99%

“…A stronger local field enhancement can be obtained in the middle dielectric wall between inner silver and outer tube at the resonance wavelength [18]. Moradi has theoretically studied how the plasmon excitations of the system depend on the dielectric difference between the core and shell in coated metallic nanowires [19]. Zhu et al have reported the local dielectric environment dependent local field enhancement properties in double concentric silver nanotube using plasmon hybridization method and quasi-static calculation [20].…”

Section: Introductionmentioning

confidence: 99%

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Geometrical Tunability and Local Electric Field Distribution of Gold-dielectric-silver three-layered Cylindrical Nanotube

et al. 2021

Preprint

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In this paper, the effects of inner core radius, shell thickness, the dielectric function of middle nanoshell and surrounding medium on localized surface plasmon resonance (LSPR) of gold-dielectric-silver nanotube are studied based on the quasi-static approximation. Theoretical calculation results show that LSPR of gold-dielectric-silver nanotube and LSPR numbers can be well optimized by tuning the geometrical parameters. The longer wavelength of |ω−⟩ mode takes place a distinct red-shift with an increase in the inner core radius and the thickness of middle dielectric layer, while a blue-shift with increasing outer shell thickness. The physical mechanisms are investigated based on induced charges, plasmon hybridization theory and phase retardation. In addition, the effect of middle dielectric function and surrounding medium on LSPR , the local electric field distribution are also reported. Our study provides a way to analyze and broaden the applications of gold-dielectric-silver nanotube.

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Section: B the Effect Of Middle Dielectric Layer Radius On Lspr Of Gsupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: B the Effect Of Middle Dielectric Layer Radius On Lspr Of Gmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geometrical Tunability and Local Electric Field Distribution of Gold-dielectric-silver three-layered Cylindrical Nanotube

et al. 2021

Preprint

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“…Figure 3(d) presents different possible plasmon modes (queued up according to their respective energy) in a three-layer nanosphere, depending on the nature of interaction between surface charges of layer 1, layer 2, and layer 3. Antisymmetric coupling between plasmons of layer 3 and layer 2 results in antibonding (AB) type of interaction, whereas symmetric coupling between them leads to bonding (B) type of interaction [33,40]. Further, for each "AB" and "B" type interaction between the plasmons of layer 3 and layer 2, there is possibility of either symmetric (sym) or asymmetric (asym) type alignment of the surface charges associated with layer 1 and layer 2.…”

Section: Scattering Profile In Absence Of Absorption Lossesmentioning

confidence: 99%

Unveiling ultrasharp scattering–switching signatures of layered gold–dielectric–gold nanospheres

et al. 2013

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We study the light scattering profile of a subwavelength layered gold-dielectric-gold nanosphere, which unveils exciting ultrasharp scattering-switching signatures based on high spectral proximity of the scattering resonance and cloaking states. Analytical expressions are derived for polarizability, resonance/cloaking conditions, and for scattering cross section of this layered metal-dielectric-metal (MDM) nanosphere, under the quasi-static limit. Our analysis allows one to thoroughly investigate its spectral response, over the entire parametric space of its dimensions and the incident light wavelength. Especially, the scattering spectra reveal multiple Fano-type, ultrasharp spectral profiles with high tunability, in terms of abrupt scattering-switching wavelengths and cloaking bandwidth, when absorption losses in the metallic layers are neglected in the analysis. Upon inclusion of bulk metallic losses along with enhanced electron surface scattering effects, these sharp spectral signatures are found to get severely faded in a realistic layered MDM nanosphere. The results obtained analytically, in each case, are found to be in excellent agreement with the numerical ones calculated based on Mie theory. We demonstrate that the ultrasharp scattering signatures of a pragmatic MDM nanosphere can be revived by introducing semiconductor gain inclusions in the middle dielectric layer, mitigating losses in the metallic layers.

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A Plethora of Plasmonics from the Laboratory for Nanophotonics at Rice University

Halas¹,

Lal²,

Link³

et al. 2012

Advanced Materials

100

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The study of the surface plasmons of noble metals has emerged as one of the most rapidly growing and dynamic topics in nanoscience. Key advances in the synthesis of noble metal nanoparticles and nanostructures have resulted in a broad variety of structures whose geometries can be controlled systematically at the nanoscale. Arising from these efforts is a new level of insight and understanding regarding the fundamental properties of localized plasmons supported by these structures, and, in particular, the properties of interacting plasmon systems. This additional insight has led to the design of plasmonic systems that support coherent phenomena, such as Fano resonances. A broad range of applications are emerging for these structures: single- nanoparticle and nanogap chemical sensors, low-loss plasmon waveguides, and active plasmonic devices and detectors. Applications in biomedicine that exploit the strong photothermal response of nanoparticle plasmons have developed and advanced into clinical trials. The Laboratory for Nanophotonics at Rice has been home to many of these advances. Here, we showcase a variety of functional plasmonic materials and nanodevices emerging from our individual and collaborative efforts.

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Plasmon hybridization in coated metallic nanowires

Cited by 24 publications

References 15 publications

Geometrical Tunability and Local Electric Field Distribution of Gold-dielectric-silver three-layered Cylindrical Nanotube

Geometrical Tunability and Local Electric Field Distribution of Gold-dielectric-silver three-layered Cylindrical Nanotube

Unveiling ultrasharp scattering–switching signatures of layered gold–dielectric–gold nanospheres

A Plethora of Plasmonics from the Laboratory for Nanophotonics at Rice University

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