Numerical Simulation of Extinction Spectra of Plasmonically Coupled Nanospheres Using Discrete Dipole Approximation: Influence of Compositional Asymmetry

Roopak, Sangita; Pathak, Nilesh Kumar; Ji, Alok; Pathak, Hardik; Sharma, R. P.

doi:10.1007/s11468-016-0216-3

Cited by 16 publications

(4 citation statements)

References 47 publications

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“…ε ∞ =10 is the dielectric constant at the infinite frequency, γ=1.10×10 14 Hz is the electron collision frequency, ω p =1.37×10 16 Hz is the bulk plasma frequency, and ω is the angular frequency of incident light. The propagation direction of the incident light is along the z-direction and the wavelength is λ.…”

Section: Model and Methodsmentioning

confidence: 99%

“…Both bonding and antibonding properties have a great relationship with the geometry of the nanorod dimer, including the length, the diameter and the gap width [15]. Moreover, the bonding and antibonding modes also exist in other nanostructures like nanospheres [16], nanodisks [17], nanorings [18], nanostars [19], nanowires [20], nanocubes [21] and nano core-shell [22] structures and express diversiform properties. However, the antibonding mode is very weak compared to the bonding mode, which is detrimental to many applications.…”

Section: Introductionmentioning

confidence: 99%

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Screened bonding, antibonding and charge transfer plasmon modes in conductively connected nanorod heterodimer

Zhang

Jiang

et al. 2018

J. Opt.

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Screened bonding (SB), screened antibonding (SA) and charge transfer plasmon (CTP) modes in the conductively connected nanorod heterodimer are studied in detail by simulation. All of the SB, SA and CTP modes can be observed in the extinction spectra of the conductively connected nanorod heterodimer. Also, the amplitudes of the three modes can be tuned by changing the radius of the cylinder conductive connection. Even the amplitude of the SA mode can be tuned to be higher than that of the SB mode, which is difficult to achieve in an unconnected nanorod heterodimer. Furthermore, the wavelengths of the three plasmon modes can be adjusted with a high degree of freedom, since the wavelength of the SB mode mainly depends on the length of the longer nanorod, the wavelength of the SA mode mainly depends on the length of the shorter nanorod and the wavelength of the CTP mode mainly depends on the total length of the nanorod heterodimer. Our study will be helpful for the design of plasmon enhancement devices, such as surface enhanced Raman scattering (SERS), plasmon enhanced fluorescence, plasmon rulers and so on.

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Section: Model and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Screened bonding, antibonding and charge transfer plasmon modes in conductively connected nanorod heterodimer

Zhang

Jiang

et al. 2018

J. Opt.

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“…This results in a staircase-like estimation inducing errors to the original model. In contrast, the volume integral equations [19], the discrete dipole approximation (DDA) [20], the surface integral equations [21], and the boundary element method (BEM) [22] are types of popular integral numerical methods. The BEM method on electromagnetic field originated by charge distribution within a material and flow at its interface.…”

Section: Introductionmentioning

confidence: 99%

Exploration of bimetallic Au@Ag Core-Shell Nanocubes Dimers supports plasmonic Fano resonances

Maati

Alkallas

Trabelsi

et al. 2022

Preprint

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We report a theoretical simulation of optical spectra of Au@Ag core/shell nanocubes dimers. The influence of the core/shell size ratio and the dimers separation gap on these spectra have been studied using boundary element method (BEM). The scattering sections of various core/shell size ratio (= 10–80%) with different separation gap (2 to 16 nm) have been numerically determined via Maxwell equations. We have examined the scattering sections along a wide wavelengths range, 250–1500 nm, in visible and IR domain. The edge lengths of 60, 80, 100 and 120 nm of the shell nanocubes have been considered. We revealed the formation of Fano resonance line shape through the investigation of the scattering section variation within the entire wavelengths. The Fano resonance line shape emerges with the variation of the gap between the dimer as well as of the core/shell size ratio. The trace of the Fano interference dip is slightly blue shifted and it is lost above gap separation equal 4 nm. The core/shell dimer with varied core/shell size ratio manipulate and image easily the trace of the Fano resonance dip up to core/shell size ratio equal 50% for gap separation above 4 nm. We demonstrate the important duality of the gap separation and core/shell ratio variation in designing Fano resonance interface. This has a potential effect on applications in nonlinear optics, metamaterial, tunable nanophotonic devices such as filters, wave-guiding, subwavelength optical imaging, chemical and biological sensing.

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“…In a homodimer, depending on the state of polarization of the incident light, either the bonding mode or the antibonding mode is optically bright, whereas the other one is dark. Consequently, one often observes either a red-shifted or a blue-shifted coupled plasmon mode. , Asymmetry can now be introduced into the dimer systems to form heterodimers in three ways: (i) by considering two particles of same geometry, but with varying composition, − (ii) by considering two particles of varying geometry, but with same composition, , and (iii) by considering two particles of varying geometry as well as composition. , One of the major differences between a homodimer and a heterodimer is that both the hybrid modes are bright modes in the latter, whereas only one of them is a bright mode in the former. The experimental characterization of the relative phases of the individual LSPR modes in dimers is currently possible due to techniques like electron energy loss spectroscopy .…”

Section: Introductionmentioning

confidence: 99%

Overwhelming Analogies between Plasmon Hybridization Theory and Molecular Orbital Theory Revealed: The Story of Plasmonic Heterodimers

2018

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Plasmon hybridization theory (PHT), an analogue of molecular orbital theory (MOT) for plasmonic molecules, has enjoyed tremendous success over the last decade in discerning the optical features of hybrid nanostructures in terms of their constituent monomeric nanostructures. Dimers of metal nanoparticles served as prototypes in elucidating many of the key aspects of plasmon hybridization. Employing quantum two-state model, in conjunction with the quasi-static approximation and the finite-difference time-domain simulations, we demonstrate that the analogy between PHT and MOT can be further propelled by a theoretical estimation of the plasmon-coupling strengths and the relative contributions of the unhybridized monomeric states toward the hybrid dimeric states in plasmonic Ag–Au nanorod heterodimers. The aspect ratio of the constituent nanorods and the gap size between the monomeric nanorods can further be used as handles to tune the relative contributions of (i) the bonding and the antibonding modes to the total extinction and (ii) the monomeric states toward the dimeric states, with meaningful implications for surface-enhanced spectroscopy. The tunability in light absorption properties of heterodimers in the 400–800 nm region arising as a result of broken symmetry is also suggestive of their potential role as plasmonic rulers for measuring distances.

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Numerical Simulation of Extinction Spectra of Plasmonically Coupled Nanospheres Using Discrete Dipole Approximation: Influence of Compositional Asymmetry

Cited by 16 publications

References 47 publications

Screened bonding, antibonding and charge transfer plasmon modes in conductively connected nanorod heterodimer

Screened bonding, antibonding and charge transfer plasmon modes in conductively connected nanorod heterodimer

Exploration of bimetallic Au@Ag Core-Shell Nanocubes Dimers supports plasmonic Fano resonances

Overwhelming Analogies between Plasmon Hybridization Theory and Molecular Orbital Theory Revealed: The Story of Plasmonic Heterodimers

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