Nondipole Optical Scattering from Liquids and Nanoparticles

Sharma, Natthi L.

doi:10.1103/physrevlett.98.217402

Cited by 15 publications

(6 citation statements)

References 22 publications

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“…Experimentally, we have demonstrated that observed magnetic scattering is purely dipolar, is nonlinear in origin, and is comparable to ED scattering only at elevated (but nonrelativistic) intensities in bound electron systems by virtue of resonant enhancement. All the results of this paper (experimental and theoretical) are consistent with the dipole approximation ͑a / 1͒, in contradistinction to [16]. Our model explains the unprecedented intensity of MD emission as the result of parametrically enhanced magnetic forces acting on bound electrons, exceeding the standard limit of magnetic response expressed by Eq.…”

Section: Conclusion and Summarysupporting

confidence: 72%

Optically induced magnetization in homogeneous, undoped dielectric media

2008

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A widely held viewpoint in optics, namely, that dynamic magnetic effects are extremely weak at optical frequencies, is re-examined. Nonlinear charge motion induced by the optical magnetic field in dielectric systems is analyzed, is predicted to be resonantly enhanced, and is observed experimentally in CCl 4 , C 6 H 6 , and H 2 O at the fundamental input frequency. Excellent agreement is obtained with a classical magnetic harmonic oscillator model, which shows that the maximum dynamic magnetic dipole (MD) moment at optical frequencies is one half the electric dipole (ED) moment. As a consequence, magnetic dipole radiation generated by the optical magnetic field with an intensity one fourth that of ED radiation, as well as unanticipated nonlinear optical effects such as magnetic white-light generation, can arise in homogeneous transparent dielectrics. The mechanism of MD formation is confirmed experimentally to be second order in the input field, and the strength of the radiation is accounted for as a first-order contribution to the vector potential. Predictions are made of optical magnetic resonance, negative permeability, self-induced magnetic birefringence, and optically induced Faraday rotation.

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Section: Conclusion and Summarysupporting

confidence: 72%

Optically induced magnetization in homogeneous, undoped dielectric media

2008

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“…They are fitted for each wavelength to oscillating functions B ⊥ + A ⊥ cos 2 ϕ and B + A sin 2 ϕ, respectively. The common background B ⊥ ∼ = B is less than 4% of the amplitude of the ED mode, hence confirming the isotropic response of the MNCs [23].…”

Section: -2supporting

confidence: 62%

“…S i coefficients do not depend on ϕ and the nondiagonal terms S 3 and S 4 vanish. Moreover, at a scattering angle θ = 90 • , the scattering amplitude S 1 contains the radiation of the electric dipole only, whereas S 2 cumulates the radiations of the magnetic dipole and the electric quadrupole [23].…”

Section: -2mentioning

confidence: 99%

Resonant isotropic optical magnetism of plasmonic nanoclusters in visible light

et al. 2015

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We present a full experimental characterization of isotropic artificial optical magnetism at visible frequencies produced by "raspberrylike" plasmonic nanoclusters synthesized by a bottom-up approach. Experimental measurements of extinction and light scattering associated with numerical simulations enable one to extract absolute values of the magnetic scattering cross section across the whole visible spectral range. The strength of the resonant magnetic response of a single magnetic nanocluster is illustrated as the effective magnetic permeability of a homogeneous sphere of identical volume.

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“…We use the amplitude scattering matrix formalism for the analysis of the scattering data [30]:  and n  constructed from the Legendre polynomials are alternately odd and even functions of cos so that for  = 90°, each scattering coefficient n a and n b appears either in S 1 or S 2 but never in both. As shown in section II, the scattering amplitude S 1 reduces to the radiation of the electric dipole ED (a 1 ) only whereas S 2 cumulates the radiations of the magnetic dipole MD (b 1 ) and the electric quadrupole EQ (a 2 ) [31,18,20].…”

Section: -Optical Studies: Static Light Scattering (Sls)mentioning

confidence: 99%

High optical magnetism of dodecahedral plasmonic meta-atoms

et al. 2018

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The generation in artificial composites of a magnetic response to light comparable in magnitude with the natural electric response, may offer an invaluable control parameter for a fine steering of light at the nanoscale. In many experimental realizations however, the magnetic response of artificial meta-atoms is too weak so that there is a need for new designs with increased magnetic polarizability. Numerical simulations show that geometrical plasmonic nanostructures based on the ideal model of Platonic solids are excellent candidates for the production of strong optical magnetism in visible light. Inspired by this model, we developed a bottom-up approach to synthesize plasmonic nano-clusters made of twelve gold patched located at the center of the faces of a dodecahedron. The scattering of the electric and magnetic dipole induced by light are measured across the whole visible range. The ratio of the magnetic to electric response at resonance is found three times higher than its counterpart measured on disordered plasmonic clusters ("plasmonic raspberries") of the same size. Numerical simulations confirm the experimental measurements of the magnetic response. Introduction:

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Nondipole Optical Scattering from Liquids and Nanoparticles

Cited by 15 publications

References 22 publications

Optically induced magnetization in homogeneous, undoped dielectric media

Optically induced magnetization in homogeneous, undoped dielectric media

Resonant isotropic optical magnetism of plasmonic nanoclusters in visible light

High optical magnetism of dodecahedral plasmonic meta-atoms

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