Nonlinear magneto-optical Kerr effect in hyper-Rayleigh scattering from layer-by-layer assembled films of yttrium iron garnet nanoparticles

Мурзина, Т. В.; Nikulin, A. A.; Aktsipetrov, O.A.; Ostrander, John W.; Mamedov, Arif A.; Kotov, Nicholas A.; Devillers, M.A.C.; Roark, Joel

doi:10.1063/1.1389328

Cited by 23 publications

(7 citation statements)

References 11 publications

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“…Subsequent experiments exploited the surface sensitivity of SHG to monitor molecular adsorption on 22,23,29 and transfer between 30 particles, to observe molecular transport across the bilayer in liposomes, 21,31,32 to measure electric surface charge and potential, 33,34 and to observe the formation of a surface charge-transfer complex. 35 Other related experiments include SHG or sum-frequency generation from nanoparticles in solutions, [36][37][38][39][40][41][42][43][44][45][46][47][48][49] from embedded [50][51][52][53][54][55][56][57][58][59][60] and supported [61][62][63][64][65][66][67][68][69][70][71][72][73]…”

Section: Methodsmentioning

confidence: 99%

Theory of optical second-harmonic generation from a sphere of centrosymmetric material: small-particle limit

2004

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The electromagnetic theory of optical second-harmonic generation from small spherical particles comprised of centrosymmetric material is presented. The interfacial region where the inversion symmetry is broken provides a source of the nonlinearity. This response is described by a general surface nonlinear susceptibility tensor for an isotropic interface. In addition, the appropriate weak bulk terms for an isotropic centrosymmetric medium are introduced. The linear optical response of the sphere and the surrounding region is assumed to be isotropic, but otherwise arbitrary. The analysis is carried out to leading order in the ratio of (a/), the particle radius to the wavelength of the incident light, and can be considered as the Rayleigh limit for secondharmonic generation from a sphere. Emission from the sphere arises from both induced electric dipole and electric quadrupole moments at the second-harmonic frequency. The former requires a nonlocal excitation mechanism in which the phase variation of the pump beam across the sphere is considered, while the latter is present for a local-excitation mechanism. The locally excited electric dipole term, analogous to the source for linear Rayleigh scattering, is absent for the nonlinear case because of the overall inversion symmetry of the problem. The second-harmonic field is found to scale as (a/) 3 and to be completely determined by two effective nonlinear susceptibility coefficients formed as a prescribed combination of the surface and bulk nonlinearities. Characteristic angular and polarization selection rules resulting from the mechanism of the radiation process are presented. Various experimental aspects of the problem are examined, including the expected signal strengths and methods of determining the nonlinear susceptibilities. The spectral characteristics associated with the geometry of a small sphere are also discussed, and distinctive localized plasmon resonances are identified.

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Section: Methodsmentioning

confidence: 99%

Theory of optical second-harmonic generation from a sphere of centrosymmetric material: small-particle limit

2004

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“…By utilizing the LbL technique, multilayers of well-defined thickness, composition, and structure can be prepared on a variety of supports. − The thickness of the multilayer films can be controlled with nanoscale (<1 nm) precision. − Films can comprise, for example, alternating layers of PEs, or proteins, nanoparticles, or dye molecules interspersed with PEs. Various types of LbL assembled multilayer films have been employed as light-emitting diodes, nonlinear optical and electrochromic devices, and sensors. , The versatility of the LbL strategy lies not only in the wide range of suitable layer components that can be used and the control that can be exerted over the film thickness and structure, but also in the applicability of a wide range of substrates that can be used as supports to deposit the thin multilayer films metal nanorods and nanoparticles, and enzyme microcrystals .…”

Section: Introductionmentioning

confidence: 99%

Thin Multilayer Films of Weak Polyelectrolytes on Colloid Particles

et al. 2002

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We report the formation of poly(acrylic acid) (sodium salt) (PAA) and poly(allylamine hydrochloride) (PAH) multilayers on polystyrene (PS) and melamine formaldehyde (MF) colloid particles by the layer-by-layer (LbL) assembly technique. The use of different solution processing conditions (e.g., pH and ionic strength) was found to have a pronounced effect on film growth, with the degree of dissociation of both polyelectrolytes (PEs) playing an important role for regular PAA/PAH multilayer growth. To retain colloidal stability during the sequential adsorption of PEs, it was essential to deposit the PE layers from adsorption solutions where the PEs are in a highly charged state, the degree of which was regulated by varying the pH. Thicker PAA/PAH coatings were obtained when the pH value of the PAA deposition solution was close to the pK a value of PAA in solution. The presence of salt in the deposition and rinsing solutions also promoted the formation of thicker PAA/PAH coatings. The ζ-potential of the particles, measured at different pH values, allowed estimation of the isoelectric point (pI) of the adsorbed layers. The pI values of the coatings showed a dependence on the nature of the underlying layers and particle surface, particularly when PAA formed the outermost layer. A pI of 5.5 was observed for PAA adsorbed on bare MF particles, compared with a pI of 2.5 for (PAA/PAH) 2-coated PS spheres. The formation of hollow PAA/PAH capsules, achieved by removal of the core from the PAA/PAH-coated colloids, further confirmed the deposition of PAA and PAH multilayers. The techniques of microelectrophoresis, fluorescence spectroscopy, and transmission electron microscopy were used to characterize the layer buildup and film morphology. The formation of PAA/PAH multilayers on colloids highlights the potential of weak PEs for exploitation in colloid surface modification and encapsulation technologies.

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“…One of the new techniques that can be used for NP processing in thin films is the layer-by-layer (LBL) assembly on polyelectrolytes (PEs). ,− It is both potent and simple. It also affords a high degree of structural control and quality of the coatings. − …”

Section: Introductionmentioning

confidence: 99%

Semiconductor Nanoparticles on Solid Substrates: Film Structure, Intermolecular Interactions, and Polyelectrolyte Effects

2002

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Citrate-stabilized CdSe or CdSe/CdS core-shell nanoparticles (NPs) were adsorbed on the standard silicon wafers bearing either a short-chain covalently bound adsorption promoter (3-aminopropyl)triethoxylsilane (APTES) or macromolecular adsorption promotersspolyethylenimine (PEI) or poly-(diallydimethylammonium) chloride (PDDA). The aim of this study is 2-fold: (1) to compare different methods of NP processing into thin films and (2) to elucidate the effect of the long-chain dynamics on the NP film structure. Systematic atomic force microscopy study of the films revealed that both types of NPs produced densely packed films on PDDA, while rarified films with significant clustering formed on PEI and APTES. The difference in NP layer morphologies was rationalized on the basis of intermolecular NP-polyelectrolyte interactions. Importantly, we observed that the adsorption layer of the weak polyelectrolyte PEI could alter its chain distribution by partial wrapping around the NPs, while no disturbance in APTES and PDDA monolayer by NP was observed. This was attributed to more labile binding of PEI to the solid substrate than for other adsorption promoters.

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Nonlinear magneto-optical Kerr effect in hyper-Rayleigh scattering from layer-by-layer assembled films of yttrium iron garnet nanoparticles

Cited by 23 publications

References 11 publications

Theory of optical second-harmonic generation from a sphere of centrosymmetric material: small-particle limit

Theory of optical second-harmonic generation from a sphere of centrosymmetric material: small-particle limit

Thin Multilayer Films of Weak Polyelectrolytes on Colloid Particles

Semiconductor Nanoparticles on Solid Substrates: Film Structure, Intermolecular Interactions, and Polyelectrolyte Effects

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