The polarizability of a truncated sphere on a substrate I

Wind, M.M.; Vlieger, J.; Bedeaux, Dick

doi:10.1016/0378-4371(87)90260-3

Cited by 156 publications

(130 citation statements)

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“…Here we show that greatly enhanced local electric fields are produced at the SIGN surface, even at the off-resonant wavelengths of 800 nm, according to the theoretical calculation based on the quasi-static approximation [9,10,13]. Figure 4(a) shows the calculated amplitude of the local electric field component normal to the SIGN surface, E loc , as a function of the polar angle θ along the meridian at the azimuthal angle ϕ 0°f rom the x axis, when a p-polarized unit electric field, E 0 1, is applied at an angle of incidence of 45°.…”

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confidence: 65%

“…The gap between the SIGN and the surface is supported by an aminoundecanethiol (AUT) self-assembled monolayer (SAM). The SIGNs show an intense resonance of LSPs, as a result of the EM interaction between the SIGNs and the gold surface [9][10][11][12][13]. Second-order NLO optical phenomena, second-harmonic generation (SHG) [10,11], OR and the Pockels effect [12], have been observed from the SIGNs, since the SIGN structure is noncentrosymmetric.…”

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confidence: 99%

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Terahertz emission from surface-immobilized gold nanospheres

et al. 2012

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Electromagnetic wave emission based on optical rectification at terahertz (THz) wavelengths was observed from surface-immobilized gold nanospheres (SIGNs) above a gold surface. Although the excitation wavelength is offresonant with the localized surface plasmons, the THz emission field was observed to be approximately 4.8 times greater than that from a percolated gold thin film of 10 nm thickness. A theoretical calculation predicts that the light electric field is enhanced in the SIGN system, even at off-resonance wavelengths. The observed THz field amplitude was quadratic with the illumination light field, suggesting that the THz generation is due to a second-order nonlinear optical process. showed THz generation at gold and silver surfaces [3]. A metallic surface shows second-order NLO activity because of the lack of an inversion center near the surface. Later they reported OR-based THz generation in thick metal films (100-200 nm thick), and attributed the optical nonlinearity to nonlocal effects [4]. On the other hand, Ramakrishnan and Planken have reported THz emission from a thin percolated gold film of 10 nm thickness, having localized surface plasmon (LSP) hot spots [5]. Recently Ramakrishnan et al. observed THz emission from ordered NLO chromophores in a molecular monolayer at the surface plasmon resonance condition [6]. In these studies, the THz emission amplitude is quadratic in the excitation field, suggesting that the THz emission is based on the second-order NLO process. On the contrary, Welsh et al. [7] and Polyushkin et al.[8] observed a non-quadratic dependence of the THz emission amplitude on the incident electric field. They attributed the THz emission from the metallic surface to multiphoton ionization and ponderomotive acceleration of electrons in the evanescent field produced by surface plasmons. This process may be called gindirect OR. These different observations suggest that different THz generation mechanisms are possible at gold surfaces.In this letter, we report THz emission from surfaceimmobilized gold nanospheres (SIGNs) above a gold surface with a gap distance of less than 1 nm. The SIGN structure is schematically illustrated in Fig. 1(a). The gap between the SIGN and the surface is supported by an aminoundecanethiol (AUT) self-assembled monolayer (SAM). The SIGNs show an intense resonance of LSPs, as a result of the EM interaction between the SIGNs and the gold surface [9][10][11][12][13]. Second-order NLO optical phenomena, second-harmonic generation (SHG) [10,11], OR and the Pockels effect [12], have been observed from the SIGNs, since the SIGN structure is noncentrosymmetric. Here, THz emission was observed from the SIGNs and its amplitude was found to be quadratic in the excitation field amplitude. This indicates that the THz generation is due to a second-order NLO process.The SIGN sample was prepared by the following procedure: As a substrate, a 100 nm thick thin gold film was vacuum-evaporated on a glass slide. The surface was covered with an AUT SAM, by dipping the gold subs...

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Terahertz emission from surface-immobilized gold nanospheres

et al. 2012

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“…In other works where the polarizability of an object at an interface was considered, either "free" polarization is assumed, or the question of whether excess or net dipole moments were used in the definition was not made clear [11,14,21,22]. Other treatments of scattering by dielectric spheres partially embedded at an interface are given in [26][27][28][29].…”

Section: Polarizability Of a Conducting Scatterer In An Interfacementioning

confidence: 99%

“…If a certain degree of symmetry exists, however, some results in this direction can be obtained, as will be explained in the following subsection. Otherwise, numerical methods will have to be used in general, either specialized ones such as those in [14,[26][27][28][29] or general ones such as FDTD or finite-elements ( [25], for example).…”

Section: Polarizability Of a Scatterer At Or Near A Dielectric Interfacementioning

confidence: 99%

The Field of an Electric Dipole and the Polarizability of a Conducting Object Embedded in the Interface Between Dielectric Materials

Mohamed¹,

Kuester²,

Piket-May³

et al. 2009

PIER B

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Abstract-In this paper, a study is made of the electrostatic potential and field of an electric dipole located in the interface between two dielectric regions. When the dipole is oriented perpendicular to the interface, the detailed position of the charges of the dipole relative to the location of the interface has a significant effect on the value of the field produced away from the dipole, unlike the case of a dipole parallel to the interface. It is shown that it is the total dipole moment (due to both free and bound charges), rather than simply the impressed (free) dipole moment that is important in determining the field in this case. Based on these results, the question of defining and determining the electric polarizability of a perfectly conducting object partially embedded in a dielectric interface is examined. The example of a conducting sphere embedded halfway in the interface is studied as a demonstration of our general formulation. The results of this paper are important for the proper modeling of arrays of scatterers embedded in an interface, such as frequency-selective surfaces (FSSs) and metafilms.

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“…The present work goes beyond that, taking into account retardation effects, allowing us to correctly describe the imaginary part of the polarizability. It should be noted that the problem of determining the nanoparticle's polarizability in the presence of a homogeneous flat dielectric substrate has also been considered previously both in the electrostatic approximation [20] and in the full electrodynamic approach [6,21,22]. Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Impact of Graphene on the Polarizability of a Neighbour Nanoparticle: A Dyadic Green’s Function Study

et al. 2017

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Abstract:We discuss the renormalization of the polarizability of a nanoparticle in the presence of either: (1) a continuous graphene sheet; or (2) a plasmonic graphene grating, taking into account retardation effects. Our analysis demonstrates that the excitation of surface plasmon polaritons in graphene produces a large enhancement of the real and imaginary parts of the renormalized polarizability. We show that the imaginary part can be changed by a factor of up to 100 relative to its value in the absence of graphene. We also show that the resonance in the case of the grating is narrower than in the continuous sheet. In the case of the grating it is shown that the resonance can be tuned by changing the grating geometric parameters.

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The polarizability of a truncated sphere on a substrate I

Cited by 156 publications

References 12 publications

Terahertz emission from surface-immobilized gold nanospheres

Terahertz emission from surface-immobilized gold nanospheres

The Field of an Electric Dipole and the Polarizability of a Conducting Object Embedded in the Interface Between Dielectric Materials

Impact of Graphene on the Polarizability of a Neighbour Nanoparticle: A Dyadic Green’s Function Study

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