Nonresonant Local Fields Enhance Second-Harmonic Generation from Metal Nanoislands with Dielectric Cover

Chervinskii, Semen; Koskinen, Kalle; Scherbak, Sergey; Kauranen, Martti; Lipovskii, A. A.

doi:10.1103/physrevlett.120.113902

Cited by 22 publications

(21 citation statements)

References 47 publications

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“…The increase of the SHG signal originates from approaching the MD resonance mode of BTO at the fundamental wavelength. 41 After 1050 nm a peak corresponding to the MQ resonance mode of the dielectric nanoparticle appears, the MD resonance of the dielectric nanoparticle remains low on the spectrum due to the symmetry of modes and the crystalline structure of BTO. We already highlight the spectral range from 1100 nm to 1400 nm, which corresponds to the longwavelength hybridization region for nanodimers ( Figure 3a).The measured polar dependence of the BTO nanoparticle has a typical four-lobe structure due to its crystal orientation on the whole wavelength range of the polar plot, (Figure 3b).…”

Section: Dielectrics Barium Titanatementioning

confidence: 99%

Reshaping the Second-Order Polar Response of Hybrid Metal–Dielectric Nanodimers

et al. 2019

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We combine the field confinement of plasmonics with the flexibility of multiple Mie resonances by bottom-up assembly of hybrid metal-dielectric nanodimers. We investigate the electromagnetic coupling between nanoparticles in heterodimers consisting of gold and barium titanate (BaTiO3 or BTO) nanoparticles through nonlinear second-harmonic spectroscopy and polarimetry. The overlap of the localized surface plasmon resonant dipole mode of the gold nanoparticle with the dipole and higher-order Mie resonant modes in the BTO nanoparticle lead to the formation of hybridized modes in the visible spectral range. We employ the pick-and-place technique to construct the hybrid nanodimers with controlled diameters by positioning the nanoparticles of different types next to each other under a scanning electron microscope. Through linear scattering spectroscopy, we observe the formation of hybrid modes in the nanodimers. We show that the modes can be directly accessed by measuring the dependence of the second-harmonic generation (SHG) signal on the polarization and wavelength of the pump. We reveal both experimentally and theoretically that the hybridization of plasmonic and Mie-resonant modes leads to a strong reshaping of the SHG polarization dependence in the nanodimers, which depends on the pump wavelength. We compare the SHG signal of each hybrid nanodimer with the SHG signal of single BTO nanoparticles to estimate the enhancement factor due to the resonant mode coupling within the nanodimers. We report up to 2 orders of magnitude for the SHG signal enhancement compared with isolated BTO nanoparticles.

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Section: Dielectrics Barium Titanatementioning

confidence: 99%

Reshaping the Second-Order Polar Response of Hybrid Metal–Dielectric Nanodimers

et al. 2019

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“…(SERS) requires the study of the optimum shell thickness for obtaining the maximum near-field enhancement at the core-shell and shell-medium interfaces [28]. Moreover, the plasmonic enhancement is particularly interesting for the study of plasmon resonances at their fundaments, including nonlinear optical processes such as second harmonic generation [31]. In this regard, one of the main advantages of CeO2 as a shell material compared to other oxides, e.g.…”

Section: Synthesis Of Au@ceo2 Hybrid Nanocrystalsmentioning

confidence: 99%

Robust one-pot synthesis of citrate-stabilized Au@CeO2 hybrid nanocrystals with different thickness and dimensionality

Bastús

Piella

Pérez

et al. 2019

Applied Materials Today

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Well-defined colloidal Au@CeO2 hybrid nanocrystals (NCs) comprising different core/shell morphologies have been synthesized via a novel and simple one-pot aqueous approach. The method allows producing hybrid morphologies composed by an active and accessible Au core coated by a porous CeO2 shell with varying shell thickness and dimensionality by simply adjusting the Au 3+ /Ce 3+ precursor ratio. These hybrid NCs are highly monodisperse and welldispersed in water, showing intense surface plasmon resonance bands that offer unique opportunities for advanced material applications, such as plasmonics and catalysis.

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“…In past decades, optical devices based on several nonlinear crystals (such as β-BaB 2 O 4 ) accomplish efficient SHG emissions. Recently, nanostructures with sub-wavelength geometries, such as BaTiO 3 nanoparticles, ZnO, ZnTe, TiO 2 , CdS, KNbO 3 , and MoS 2 nanowires, arrays of LiNbO 3 nanocones, and lithium niobate (LN) nanorings, have been demonstrated to achieve high frequency-conversion efficiencies even if the phase matching condition is violated [2,3,4,5,6,7,8,9,10]. Unfortunately, the conversion efficiency of these nanostructures still remains low for their practical applications, implying that the high operation power is essential to generate sufficient signal emissions.…”

Section: Introductionmentioning

confidence: 99%

Spatially-Controllable Hot Spots for Plasmon-Enhanced Second-Harmonic Generation in AgNP-ZnO Nanocavity Arrays

et al. 2018

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Plasmon-enhanced second-harmonic generation (PESHG) based on hybrid metal-dielectric nanostructures have extraordinary importance for developing efficient nanoscale nonlinear sources, which pave the way for new applications in photonic circuitry, quantum optics, and biosensors. However, the relatively high loss of excitation energies and the low spatial overlapping between the locally enhanced electromagnetic field and nonlinear materials still limit the promotion of nonlinear conversion performances in such hybrid systems. Here, we design and fabricate an array of silver nanoparticle-ZnO (AgNP-ZnO) nanocavities to serve as an efficient PESHG platform. The geometry of AgNP-ZnO nanocavity arrays provides a way to flexibly modulate hot spots in three-dimensional space, and to achieve a good mutual overlap of hot spots and ZnO material layers for realizing efficient SH photon generation originating from ZnO nanocavities. Compared to bare ZnO nanocavity arrays, the resulting hybrid AgNP-ZnO design of nanocavities reaches the maximum PESHG enhancement by a factor of approximately 31. Validated by simulations, we can further interpret the relative contribution of fundamental and harmonic modes to Ag-NP dependent PESHG performances, and reveal that the enhancement stems from the co-cooperation effect of plasmon-resonant enhancements both for fundamental and harmonic frequencies. Our findings offer a previously unreported method for designing efficient PESHG systems and pave a way for further understanding of a surface plasmon-coupled second-order emission mechanism for the enhancement of hybrid systems.

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Nonresonant Local Fields Enhance Second-Harmonic Generation from Metal Nanoislands with Dielectric Cover

Cited by 22 publications

References 47 publications

Reshaping the Second-Order Polar Response of Hybrid Metal–Dielectric Nanodimers

Reshaping the Second-Order Polar Response of Hybrid Metal–Dielectric Nanodimers

Robust one-pot synthesis of citrate-stabilized Au@CeO2 hybrid nanocrystals with different thickness and dimensionality

Spatially-Controllable Hot Spots for Plasmon-Enhanced Second-Harmonic Generation in AgNP-ZnO Nanocavity Arrays

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