The new mechanism of surface-enhanced second harmonic generation in small metallic particles

Aktsipetrov, O.A.; Baranova, I. M.; Dubinina, E.M.; Elovikov, S. S.; Elyutin, P. V.; Esikov, D. A.; Nikulin, A. A.; Fominykh, N. N.

doi:10.1016/0375-9601(86)90084-8

Cited by 22 publications

(5 citation statements)

References 6 publications

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“…Various metal nanoparticle arrays formed by Volmer-Weber or island thin film growth, which are morphologically analogous to particle arrays formed by the dewetting of a thin film, have been used for investigating surface enhanced SHG and THG. In particular, see works reported on the enhancement of second-harmonic [190][191][192][193] and third-harmonic [194,195] generations. These studies investigated the effects of the nanoparticle size (Figure 26a,b) and spacer thickness between the nanoparticles and the nonlinear substrate (Figure 26c,d).…”

Section: Nonlinear Nanophotonicsmentioning

confidence: 99%

Dewetting mechanisms and their exploitation for the large-scale fabrication of advanced nanophotonic systems

Zuev

Makarov

2018

International Materials Reviews

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Recent progress in submicron-and nano-fabrication technologies has led to the emergence of novel photonic structures such as optical nanoantennas and metasurfaces. Real-life applications of these advanced photonic structures still require substantial improvement of the fabrication processes, in terms of their throughput and cost-effectiveness. Because of its simplicity and effectiveness, dewetting of a thin film has attained increasing attention as a feasible process for improving the scalability and productivity. Here, we provide an overview of the mechanisms and phenomenologies of dewetting to foster an improved fundamental understanding necessary for the optimisation of the dewetting process condition and template design. We then review the strategies demonstrating the use of templateddewetting for producing well-aligned arrays of submicron-and nanostructures with great control over their size, shape and arrangement. Recent applications of dewetted structures in advanced nanophotonics are reviewed with an emphasis on the exploitation of dewetting mechanisms. Special attention is given to the fabrication of resonant optical nanoantennas and nanophotonic applications in which high repeatability and throughput are important parameters: sensing, colourisation, photovoltaics and nonlinear light frequency conversion. We expect this review to provide a basis for the use of thin-film dewetting to realise the industrial-level fabrication of various practical advanced photonic systems.

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Section: Nonlinear Nanophotonicsmentioning

confidence: 99%

Dewetting mechanisms and their exploitation for the large-scale fabrication of advanced nanophotonic systems

Zuev

Makarov

2018

International Materials Reviews

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“…The second-order optical nonlinearity (or the first hyperpolarizability β) of semiconductor nanoparticles has been more sparsely investigated. − The size dependence of second harmonic generation from the surface of a composite material consisting of CdSe nanoparticles embedded in a glass matrix has been studied by Aktsipetrov et al , It was shown that the effective first hyperpolarizability β of a single particle averaged over the ensemble increases as D 5/2 with decreasing of the average particle diameter D within the range 5 nm < D < 100 nm. This effect was explained by fluctuations of the particle shape giving rise to quantum chaotic electron dynamics.…”

Section: Introductionmentioning

confidence: 99%

Size and Band-Gap Dependences of the First Hyperpolarizability of Cd_xZn₁_-_xS Nanocrystals

et al. 2002

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The first hyperpolarizability of aqueous suspensions of polyphosphate stabilized CdS nanocrystals of different mean sizes and of Cd x Zn1 - x S nanocrystals (x = 0, 0.25, 0.75, 1) was determined by the hyper-Rayleigh scattering technique. We report the first experimental observation that the first hyperpolarizability decreases as the band gap energy increases. This is ascribed to the decrease of the resonance enhancement. The surface modification of 9 nm CdS nanocrystals with OH- increases the first hyperpolarizability by a factor 1.7. This is explained in terms of the higher polarizability of the surface terminating groups after the OH- modification. Finally, we have also established the size dependence of the first hyperpolarizability for CdS nanocrystals. Although it increases with the particle size, its values normalized per CdS pair increase with decreasing of size, leading to an enhancement by 1 order of magnitude for 2 nm particles in comparison with bulk. This is explained by assuming the enhancement of both the bulk contribution from the noncentrosymmetric nanocrystal core and the surface contribution. The enhancement of the bulk contribution is ascribed to quantum confinement effects on the normalized oscillator strengths. The surface contribution becomes more relevant as the size decreases and may be enhanced by several effects, especially surface polarization. A two-level model can explain both the band-gap and the size dependences.

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“…It is known that at band structure features, as band edges and anticrossings for example in photonic crystals 25 , dielectric nanofilms 26 , or microcavities 27 , rich dynamics appears. This leads to enhancement of nonlinear optical responses 28 of the material which may be detected by THz photoconductivity technique.…”

mentioning

confidence: 99%

Terahertz detection of magnetic field-driven topological phase transition in HgTe-based transistors

Kadykov

Теппе

Consejo

et al. 2015

Applied Physics Letters

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We report on terahertz photoconductivity under magnetic field up to 16 T of field effect transistor based on HgTe quantum well (QW) with an inverted band structure. We observe pronounced cyclotron resonance and Shubnikov-de Haas-like oscillations, indicating a high mobility electron gas in the transistor channel. We discover that nonlinearity of the transistor channel allows for observation of characteristic features in photoconductivity at critical magnetic field corresponding to the phase transition between topological quantum spin Hall and trivial quantum Hall states in HgTe QW. Our results pave the way towards terahertz topological field effect transistors

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The new mechanism of surface-enhanced second harmonic generation in small metallic particles

Cited by 22 publications

References 6 publications

Dewetting mechanisms and their exploitation for the large-scale fabrication of advanced nanophotonic systems

Dewetting mechanisms and their exploitation for the large-scale fabrication of advanced nanophotonic systems

Size and Band-Gap Dependences of the First Hyperpolarizability of Cd_xZn₁_-_xS Nanocrystals

Terahertz detection of magnetic field-driven topological phase transition in HgTe-based transistors

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The new mechanism of surface-enhanced second harmonic generation in small metallic particles

Cited by 22 publications

References 6 publications

Dewetting mechanisms and their exploitation for the large-scale fabrication of advanced nanophotonic systems

Dewetting mechanisms and their exploitation for the large-scale fabrication of advanced nanophotonic systems

Size and Band-Gap Dependences of the First Hyperpolarizability of CdxZn1-xS Nanocrystals

Terahertz detection of magnetic field-driven topological phase transition in HgTe-based transistors

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Size and Band-Gap Dependences of the First Hyperpolarizability of Cd_xZn₁_-_xS Nanocrystals