Validity domain and limitation of non-retarded Green's tensor for electromagnetic scattering at surfaces

Gay-Balmaz, Philippe; Martin, Olivier J. F.

doi:10.1016/s0030-4018(00)00932-9

Cited by 33 publications

(27 citation statements)

References 13 publications

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“…The mesh used for the calculation provides an accurate description of the antennas; the interested reader is referred to Refs. [44,45] for discussion of the convergence of the method and to Ref.…”

Section: Methods and Geometrymentioning

confidence: 99%

Engineering the optical response of plasmonic nanoantennas

2008

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Abstract:The optical properties of plasmonic dipole and bowtie nanoantennas are investigated in detail using the Green's tensor technique. The influence of the geometrical parameters (antenna length, gap dimension and bow angle) on the antenna field enhancement and spectral response is discussed. Dipole and bowtie antennas confine the field in a volume well below the diffraction limit, defined by the gap dimensions. The dipole antenna produces a stronger field enhancement than the bowtie antenna for all investigated antenna geometries. This enhancement can reach three orders of magnitude for the smallest examined gap. Whereas the dipole antenna is monomode in the considered spectral range, the bowtie antenna exhibits multiple resonances. Furthermore, the sensitivity of the antennas to index changes of the environment and of the substrate is investigated in detail for biosensing applications; the bowtie antennas show slightly higher sensitivity than the dipole antenna.

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Section: Methods and Geometrymentioning

confidence: 99%

Engineering the optical response of plasmonic nanoantennas

2008

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“…Real photon propagation occurs when the half-space begins to interact with the system and multiple paths are possible for a photon to reach r from r ′ . The quasi-static approximation is often invoked for particles very close to a surface or to each other 55 , and this approximation holds for the imaginary part of the LDOS as the surface is approached at the SPP frequency; the real part deviates significantly in this limit. However, when the incident frequency is detuned from the SPP (ω = 2.63 eV), the quasi-static approximation again becomes valid.…”

Section: Silver Half-spacementioning

confidence: 99%

Optical forces between coupled plasmonic nanoparticles near metal surfaces and negative index material waveguides

2011

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We present a study of light-induced forces between two coupled plasmonic nano-particles above various slab geometries including a metallic half-space and a 280-nm thick negative index material (NIM) slab waveguide. We investigate optical forces by non-perturbatively calculating the scattered electric field via a Green function technique which includes the particle interactions to all orders. For excitation frequencies near the surface plasmon polariton and slow-light waveguide modes of the metal and NIM, respectively, we find rich light-induced forces and significant dynamical back-action effects. Optical quenching is found to be important in both metal and NIM planar geometries, which reduces the spatial range of the achievable inter-particle forces. However, reducing the loss in the NIM allows radiation to propagate through the slow-light modes more efficiently, thus causing the light-induced forces to be more pronounced between the two particles. To highlight the underlying mechanisms by which the particles couple, we connect our Green function calculations to various familiar quantities in quantum optics.

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“…In systems where the particle size is significantly smaller than the wavelength of light, each nanoparticle can be represented by a single dipole with a finite polarizability [23]. In this paper, we assume that each nanoparticle is represented by a single dipole with an arbitrary orientation.…”

Section: Theoretical Formulationmentioning

confidence: 99%

“…Optimization of a plasmonic structure for a particular application is made easier via the use of various computational tools. Most numerical techniques such as the FEM [19][20][21], the Green's tensor approach [22][23][24], discrete dipole approximation (DDA) [25,26], the boundary elements method (BEM) [27][28][29][30], and the surface integral equation (SIE) [31][32][33] compute the response of the structure due to an incident excitation.…”

Section: Introductionmentioning

confidence: 99%

Insight into the eigenmodes of plasmonic nanoclusters based on the Green’s tensor method

Dutta-Gupta¹,

Martin²

2015

J. Opt. Soc. Am. B

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Assemblies of plasmonic nanoparticles possess exotic properties that are used in numerous applications. Their efficiency for specific applications strongly depends on the modes supported by the structure. In this paper, we extend the Green's tensor formalism to compute the eigenmodes of an assembly of plasmonic nanoparticles. Using the developed technique, we investigate the specific cases of a nanoparticle monomer, dimer, and trimer. The influence of various geometrical parameters and of symmetry breaking on the eigenmodes of the assemblies is studied in detail, as well as the illumination conditions required to excite specific eigenmodes.

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Validity domain and limitation of non-retarded Green's tensor for electromagnetic scattering at surfaces

Cited by 33 publications

References 13 publications

Engineering the optical response of plasmonic nanoantennas

Engineering the optical response of plasmonic nanoantennas

Optical forces between coupled plasmonic nanoparticles near metal surfaces and negative index material waveguides

Insight into the eigenmodes of plasmonic nanoclusters based on the Green’s tensor method

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