Second Harmonic Excitation Spectroscopy of Silver Nanoparticle Arrays

Moran, Andrew M.; Sung, Jiha; Hicks, Erin M.; Duyne, Richard P. Van; Spears, Kenneth G.

doi:10.1021/jp0467604

Cited by 50 publications

(85 citation statements)

References 61 publications

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“…Silver triangular nanoprisms of different sizes (edge length) were prepared using a two-step seed mediated procedure as reported recently [11,[23][24][25]. Solution (40 ml) containing AgNO 3 (2.9 Â 10 À4 M) and trisodium citrate (2.5 Â 10 À4 M) was cooled in an ice-bath.…”

Section: Material Synthesis and Characterizationmentioning

confidence: 99%

Nonlinear optical properties of triangular silver nanomaterials

Singh

Senapati

Neely

et al. 2009

Chemical Physics Letters

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Section: Material Synthesis and Characterizationmentioning

confidence: 99%

Nonlinear optical properties of triangular silver nanomaterials

Singh

Senapati

Neely

et al. 2009

Chemical Physics Letters

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“…[1][2][3][4][5] Copper properties such as high conductivity, photosensitivity, and low cost makes it a promising material for chemical, electronic, and photonic integration in miniaturized devices for use in biological nanosensors, [6][7][8][9][10] as well as its capability of insertion in host polymer matrices for nonlinear optical applications. [11][12][13] Optical properties such as extinction and plasmon resonance are highly size dependent below 10 nm.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the structure, configuration, and sizing of Cu and Cu oxide nanoparticles generated by fs laser ablation of solid target in liquids

Santillán

Videla

Raap

et al. 2013

Journal of Applied Physics

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We report on the analysis of structure, configuration, and sizing of Cu and Cu oxide nanoparticles (Nps) produced by femtosecond (fs) laser ablation of solid copper target in liquids. Laser pulse energy ranged between 500 lJ and 50 lJ. Water and acetone were used to produce the colloidal suspensions. The study was performed through optical extinction spectroscopy using Mie theory to fit the full experimental spectra, considering free and bound electrons size dependent contributions to the metal dielectric function. Raman spectroscopy and AFM technique were also used to characterize the sample. Considering the possible oxidation of copper during the fabrication process, two species (Cu and Cu 2 O) arranged in two structures (bare core or core-shell) and in two configuration types (Cu-Cu 2 O or Cu 2 O-Cu) were considered for the fitting depending on the laser pulse energy and the surrounding media. For water at high energy, it can be observed that a CuCu 2 O configuration fits the experimental spectra of the colloidal suspension, while for decreasing energy and below a certain threshold, a Cu 2 O-Cu configuration needs to be included for the optimum fit. Both species coexist for energies below 170 lJ for water. On the other hand, for acetone at high energy, optimum fit of the full spectrum suggests the presence a bimodal Cu-Cu 2 O core-shell Nps distribution while for decreasing energy and below a 70 lJ threshold energy value, Cu 2 O-Cu core-shell Nps must be included, together with the former configuration, for the fit of the full spectrum. We discuss possible reasons for the changes in the structural configuration of the core-shell Nps. V C 2013 American Institute of Physics. [http://dx

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“…11 Enhancements as large as 10 7 have been reported in nanoparticle clusters, enabling, for example, Raman spectroscopy of single molecules. 12,13 Other than Raman spectroscopy, [14][15][16] this phenomenon has found applications in optical third-harmonic generation, [17][18][19] as well as in second-harmonic generation, [20][21][22][23][24][25][26] which is the subject of this paper. Nahata et al 23 demonstrated an ∼10 4 -fold increase in the efficiency of optical second-harmonic generation from concentric silver ring structures centered around a 200-nm aperture (bull's-eye structure) compared to a silver film with an unadorned aperture.…”

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confidence: 99%

“…Podlipensky et al 24 observed second harmonic generation (SHG) enhancement from ellipsoidal silver nanoparticles in a glass matrix grown by means of Ag + -Na + ion exchange. More recently, Moran et al 25 have demonstrated second harmonic excitation spectroscopy of silver nanoparticle arrays, which were fabricated by nanosphere lithography. In that work, a weak out-of-plane LSPR mode was made to overlap with the second harmonic of the incident laser, so that the resulting SHG emission signal became proportional to the plasmon * To whom correspondence should be addressed.…”

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confidence: 99%

Plasmon-Enhanced Second-Harmonic Generation from Ionic Self-Assembled Multilayer Films

et al. 2006

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We have demonstrated large enhancements of the effective second-order nonlinear susceptibility ( (2) ) of ionic self-assembled multilayer (ISAM) films, causing a film with just 3 bilayers to be optically equivalent to a 700−1000 bilayer film. This was accomplished by using nanosphere lithography to deposit silver nanoparticles on the ISAM film, tuning the geometry of the particles to make their plasmonic resonances overlap the frequency of optical excitation. An enhancement in the efficiency of second harmonic generation (SHG) by as much as 1600 times was observed. Even though this is already a large value, we suggest that further refinements of the techniques are expected to lead to additional enhancements of similar or larger magnitude.Second-order nonlinear optical (NLO) materials are at the heart of telecommunications devices such as electro-optic modulators and optical switches, and in lasers such as highpower green and blue solid-state lasers and optical parametric amplifiers.Conventional NLO materials generally consist of inorganic crystals such as KTP, LiTaO 3 , and LiNbO 3 . 1 While they are quite efficient, high-quality crystals of sufficient size are expensive and difficult to manufacture. Organic NLO materials provide an alternative with the potential to provide high nonlinear susceptibilities in an economical fabrication process. 2 NLO materials based on ionic self-assembled multilayer (ISAM) films are particularly promising because of the ease of tailoring noncentrosymmetric structures and the long-term stability. [3][4][5] These films are made by alternately immersing a substrate in two solutions, containing a polycation and a polyanion, respectively. If the substrate initially carries negative surface charges, dipping in the polycation solution will result in a nanoscale polymer layer selfassembled on the substrate, yielding a positively charged substrate. Subsequent dipping in the polyanion solution results in a second layer of the polyanion formed on top of the first layer. The process can be repeated as many times as desired, building up films to arbitrary thickness with nanoscale precision. ISAM films may have substantial (2) values, comparable to that of lithium niobate. 5 Various methods have been suggested to improve the effective (2) of these films by modifying their composition. 6,7 Here, we demonstrate a new approach to enhance the second-order NLO susceptibility by creating hybrid structures from ISAM films and noble metal nanoparticles. Nanoparticles made from noble metals such as silver or gold have recently attracted considerable attention due to their unusual optical properties which enable light to be controlled in unique new ways. [8][9][10] The interaction of light with the free electrons in such particles gives rise to collective oscillations of the conduction electrons at optical frequencies, known as localized surface plasmons resonances (LSPRs). When excited in this fashion, the particles act as nanoscale antennas, concentrating the electromagnetic (E-M) field into v...

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Second Harmonic Excitation Spectroscopy of Silver Nanoparticle Arrays

Cited by 50 publications

References 61 publications

Nonlinear optical properties of triangular silver nanomaterials

Nonlinear optical properties of triangular silver nanomaterials

Analysis of the structure, configuration, and sizing of Cu and Cu oxide nanoparticles generated by fs laser ablation of solid target in liquids

Plasmon-Enhanced Second-Harmonic Generation from Ionic Self-Assembled Multilayer Films

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