Experimental observation of percolation-enhanced nonlinear light scattering from semicontinuous metal films

Breit, M.; Podolskiy, Viktor A.; Grésillon, S.; Plessen, G. von; Feldmann, Jochen; Rivoal, J. C.; Gadenne, P.; Sarychev, Andrey K.; Shalaev, Vladimir M.

doi:10.1103/physrevb.64.125106

Cited by 58 publications

(46 citation statements)

References 15 publications

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“…Besides this collimated emission, some diffuse scattering at the second-harmonic frequency is also expected, because of the inhomogeneity of the medium. Indeed, such diffuse SHG scattering has been observed in a recent experiment, carried out near the percolation threshold of a random metal-insulator composite [24], in addition to the collimated beam described here. This diffusive scattering should have an intensity varying as a power of the particle radius.…”

Section: Discussionmentioning

confidence: 90%

Second-harmonic generation for a dilute suspension of coated particles

Hui

Stroud

2004

Phys. Rev. B

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We derive an expression for the effective second-harmonic coefficient of a dilute suspension of coated spherical particles. It is assumed that the coating material, but not the core or the host, has a nonlinear susceptibility for second-harmonic generation (SHG). The resulting compact expression shows the various factors affecting the effective SHG coefficient. The effective SHG per unit volume of nonlinear coating material is found to be greatly enhanced at certain frequencies, corresponding to the surface plasmon resonance of the coated particles. Similar expression is also derived for a dilute suspension of coated discs. For coating materials with third-harmonic (THG) coefficient, results for the effective THG coefficients are given for the cases of coated particles and coated discs.

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Section: Discussionmentioning

confidence: 90%

Second-harmonic generation for a dilute suspension of coated particles

Hui

Stroud

2004

Phys. Rev. B

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“…59,28 These films also show strongly enhanced second-harmonic generation. 60 It can be expected that these phenomena also exist in our Mg films and RE-Mg alloys.…”

Section: A the Origin Of The Large Absorptionmentioning

confidence: 99%

Highly absorbing black Mg and rare-earth-Mg switchable mirrors

2004

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Apart from a reflecting and a transparent state, rare-earth-Mg alloys ͑RE-Mg͒ exhibit also a highly absorbing, black state during loading with hydrogen. The occurrence of such a black state is due to the disproportionation into subwavelength size REH 2ϩ⑀ and Mg grains during the first hydrogen loading. While the optical properties of REH x change continuously with a further increase in hydrogen concentration x, Mg changes abruptly from a good reflector to a transparent insulator (MgH 2 ). Thin pure Mg films also show this black state when ͑un͒loaded carefully at elevated temperatures. By using the Bruggeman effective medium approximation in combination with the transfer matrix method it is shown that the coexistence of Mg and MgH 2 grains is the cause of this high absorption. Furthermore, we compare this phenomenon to the high absorption of light observed in metal-dielectric composites.

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“…28,29 Semicontinuous gold films support both localized and delocalized surface plasmon modes and have a much stronger local field enhancement than continuous thin film. 30 Both the metallic nanorod array and semicontinuous film are commonly used as SERS substrates due to large local field enhancements, [31][32][33][34][35][36][37][38][39] so the plasmon coupling in our nanorod-film hybrid is also expected to further enhance the local field and improve the sensitivity of SERS. In our studies, the long-axis SPR of the Au nanorod array is tuned by adjusting the rod length and the SPR of the semicontinuous Au film is tuned by controlling the sputtering deposition time.…”

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confidence: 99%

“…30 Both the metallic nanorod array and semicontinuous film are commonly used as SERS substrates due to large local field enhancements, [31][32][33][34][35][36][37][38][39] …”

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Tuning Gold Nanorod-Nanoparticle Hybrids into Plasmonic Fano Resonance for Dramatically Enhanced Light Emission and Transmission

et al. 2010

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We investigate the optical response of a gold nanorod array coupled with a semicontinuous nanoparticle film. We find that, as the gold nanoparticle film is adjusted to the percolating regime, the nanorod-film hybrids are tuned into plasmonic Fano resonance, characterized by the coherent coupling of discrete plasmonic modes of the nanorod array with the continuum band of the percolating film. Consequently, optical transmission of the percolating film is substantially enhanced. Even more strikingly, electromagnetic fields around the nanorod array become much stronger, as reflected by 2 orders of magnitude enhancement in the avalanche multiphoton luminescence. These findings may prove instrumental in the design of various plasmonic nanodevices.KEYWORDS Plasmonic Fano resonance, plasmon hybrid, gold percolating film, gold nanorod array, enhanced transmission, enhanced photoluminescence E xtensive research efforts have been devoted recently to utilizing metal nanostructures to manipulate the propagation, intensity, and polarization of light, [1][2][3][4][5][6] leading to the emergence of nanophotonics as a major new direction in photonics. In this emerging field, one central physical entity is plasmon, characterizing the collective excitation of conduction electrons in metal nanostructures. Many intriguing phenomena discovered recently, such as the squeezing of light into subwavelength nanoholes, 7-9 and the detection of molecules trapped between nanogaps via surface-enhanced Raman scattering (SERS) with single molecule sensitivity, [10][11][12] are tied to the coupling of incident light with plasmon modes. Such studies not only broaden our fundamental understanding of photon interaction with nanoscale systems, but also may have far-reaching technological impacts.In exploration of various intriguing plasmonic phenomena at the nanoscale, a widely studied and distinctive research emphasis is the exploitation of the coupling and hybridization of different plasmon modes supported by various elegantly fabricated metal nanostructures. [13][14][15][16][17][18][19][20][21][22] Compelling examples include the plasmon coupling of a discrete mode to a continuum band, known as the "plasmonic Fano resonance". The Fano type absorption spectra were first reported in hole arrays in thin metal films and coaxial metallic arrays due to interferences of localized and delocalized plasmon modes.23-25 A more vivid picture of the plasmonic Fano model with three interaction regimes was convincingly demonstrated in metallic nanoparticle-film systems by tuning the film thickness. 26 Recently, multiple Fano resonances in a metallic ring/disk dimer and twinned Fano resonances in the Au-Ag heteronanorod dimer were also reported. 27 Most research focused on the asymmetric Fano line-shape in the absorption spectra, but enhanced emissions and Raman scattering induced by constructive interferences via the plasmonic Fano effect are seldom explored, which is of great importance for both passive and active plasmonic nanosystems.In this Letter, ...

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Experimental observation of percolation-enhanced nonlinear light scattering from semicontinuous metal films

Cited by 58 publications

References 15 publications

Second-harmonic generation for a dilute suspension of coated particles

Second-harmonic generation for a dilute suspension of coated particles

Highly absorbing black Mg and rare-earth-Mg switchable mirrors

Tuning Gold Nanorod-Nanoparticle Hybrids into Plasmonic Fano Resonance for Dramatically Enhanced Light Emission and Transmission

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