Second-harmonic generation from spherical particles

Brudny, Vera L.; Mendoza, Bernardo S.; Mochán, W. Luis

doi:10.1103/physrevb.62.11152

Cited by 87 publications

(65 citation statements)

References 23 publications

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“…On the macroscopic scale, the crystal symmetry of the excited structure has to be non-centrosymmetric in order to produce a non-zero SHG signal, as SHG is a second order process. 22 In the nanometer scale, however, inhomogeneities in the elds or in the materials may induce a high second order nonlinear response, even for structures with a centrosymmetric crystal lattice. 22 24 Based on this property, in the past decade, di erent con gurations of plasmonic nanoantennas have been engineered to produce second harmonic (SH) conversion e ciencies (η * SH ) of up to 10 −6 %.…”

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confidence: 99%

“…22 In the nanometer scale, however, inhomogeneities in the elds or in the materials may induce a high second order nonlinear response, even for structures with a centrosymmetric crystal lattice. 22 24 Based on this property, in the past decade, di erent con gurations of plasmonic nanoantennas have been engineered to produce second harmonic (SH) conversion e ciencies (η * SH ) of up to 10 −6 %. 25 27 Nonetheless, the large absorption of the metallic nanostructure when excited at the plasmonic resonance severely limits the amount of power that can be delivered to the nanosystem without damaging the material or changing its refractive index, 3 preventing the possibility of achieving higher η * SH values.…”

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confidence: 99%

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Bridging the Gap between Dielectric Nanophotonics and the Visible Regime with Effectively Lossless Gallium Phosphide Antennas

et al. 2017

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We present all-dielectric gallium phosphide (GaP) nanoantennas as an e cient nanophotonic platform for surface-enhanced second harmonic generation (SHG) and uorescence (SEF), showing negligible losses in the visible range. Employing single GaP nanodisks, we observe an increase of more than three orders of magnitude in the SHG signal in comparison with the bulk. This constitutes an SHG e ciency as large as 0.0002%, which is, to the best of our knowledge, the highest yet achieved value produced by a single nano-object in the optical region. Furthermore, we show that GaP dimers with 35 nm gap can enhance up to 3600 times the uorescence emission of dyes located in the gap of the nanoantenna. This is accomplished by a uorescence lifetime reduction of, at least, 22 times, accompanied by a high intensity eld con nement in the gap region. These results open new avenues for low-loss nanophotonics in the optical regime.

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confidence: 99%

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confidence: 99%

Bridging the Gap between Dielectric Nanophotonics and the Visible Regime with Effectively Lossless Gallium Phosphide Antennas

et al. 2017

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“…1a inset: bottom) shows that the NCs emitted SH in a TEM 01 mode [4] with no SHG radiation in the exact forward direction, signifying a macroscopically quadrupolar SHG source proportional to (E · ∇)E [7,8]. Quadupolar SHG can originate from the bulk of centrosymmetric media, but here it originates from the average interface dipole response of nano-spheres [7,8]. With a single-beam, the only contribution to ∇E that radiates in the near forward direction is the transverse gradients of the incident TEM 00 mode, which point radially outward from its center.…”

Section: Single-beam Shg Results and Discussionmentioning

confidence: 98%

Second‐harmonic spectroscopy of nano‐interfaces

Sun

Figliozzi

Jiang

et al. 2005

phys. stat. sol. (c)

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Optical second-harmonic is shown to be a noninvasive, interface-sensitive probe of silicon nanocrystals. The TEM 01 spatial mode of SHG radiation from a silicon nanocrystal composite indicates there is nonlocal dipolar (quadrupolar) polarization source which is proportional to the gradient of the incoming electric field. With two orthogonally polarized laser beams, we enhanced the SHG from nanocrystals by creating wavelength-scale, forward-radiating gradient in the second-harmonic polarization. The quantitative features of two-beam SHG were also studied with a fused silica slide. We demonstrate several techniques for isolating the nano-interface signal from the (bulk-quadrupolar) substrate signal in our samples.

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“…At its surface, centrosymmetry is locally lost and therefore a nonlinear surface polarization is induced which may be approximately calculated by assuming the system to be locally flat [16,17]. However, centrosymmetry is globally recovered so that the total dipole moment would be null unless the field were inhomogeneous.…”

Section: Shg From the Bulk Of A Compositementioning

confidence: 97%

SHG from bulk and surface of nanoparticle composites

Mochán

2005

phys. stat. sol. (c)

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Three wave mixing processes such as second harmonic generation (SHG) have proven to be a sensitive probe of buried interfaces. Recently SHG has been employed to monitor the surface of Si nanocrystals within a glass matrix. Due to the macroscopic homogeneity and centrosymmetry of the composite, its bulk SHG signal is of multipolar character, produced by the non-uniformity of the fundamental light beam, and can be enhanced several orders of magnitude by employing two interfering crossed beams. On the other hand, there are surface contributions to the SHG of the composite due to the relatively large inhomogeneities of the surface local field which act on the nanoparticles and to anisotropic particle shape fluctuations. These yield dipolar contributions which are therefore insensitive to the beam profile and are not enhanced in a two-beam geometry. We calculate the SHG from a thin nanocomposite material and compare the relative strength of its surface and bulk contributions.

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Second-harmonic generation from spherical particles

Cited by 87 publications

References 23 publications

Bridging the Gap between Dielectric Nanophotonics and the Visible Regime with Effectively Lossless Gallium Phosphide Antennas

Bridging the Gap between Dielectric Nanophotonics and the Visible Regime with Effectively Lossless Gallium Phosphide Antennas

Second‐harmonic spectroscopy of nano‐interfaces

SHG from bulk and surface of nanoparticle composites

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