Second harmonic generation from resonantly excited arrays of gold nanoparticles

Multifactor-Controlled Non-Monotonic Plasmon Shift of Ordered Gold Nanodisk Arrays: Shape-Dependent Interparticle Coupling

“…Localized surface plasmon resonance (SPR) in gold and silver nanoparticles has been extensively employed in many optical spectroscopic metrologies to generate intense localized electric fields and light absorption, together with a high spectral sensitivity to their shape, structure and local environment [1][2][3][4][5][6]. These unique optical characters make the noble metallic nanoparticles potentially useful in the nonlinear optics [3], solar energy absorption [4], photo-heat conversion [5], biologic sensing [6] and optoelectronics applications.…”

Anisotropic Second- and Third-Order Nonlinear Optical Response from Anisotropy-Controlled Metallic Nanocomposites

“…At normal incidence the SP resonance of the particles is shifted to lower wavelengths for s-polarization (red line), while the absorption spectra splits into two spectrally separated SP resonances for p-polarization (black line). The shifted resonance at 365 nm obtained with s-polarized light is associated with the short-axis SP and can be explained by the decrease of the NPs size (McMahon et al, 2007) during the second ion implantation process. The resonance at 570 nm obtained with p-polarized light is associated with the longaxis SP and its broadness can be explained by the different NPs sizes formed in the matrix.…”

“…Their linear and nonlinear optical properties are dominated by collective electron-plasma oscillations, the so-called localized surface plasmon resonances (LSPRs), and a vast literature can be found elsewhere studying such properties (Aktsipetrov et al, 1995;Barnes et al, 2003;Brevet, 2011;Dadap et al, 1999;Inouye et al, 2000;Karthikeyan et al, 2008;Kim et al, 2006;Matsui, 2005;McMahon et al, 2007;Rangel-Rojo et al, 2009Ryasnyansky et al, 2006;Tominaga et al, 2001;Zheludev & Emelyanov, 2004). In particular, in 2008, when studying Cu NPs embedded in a silica matrix using nanosecond and picosecond light pulses, we found that thermal effects for the nanosecond regime, and induced polarization for the picosecond one, were the physical mechanisms responsible for the saturable optical absorption and the Kerr effect presented by the nanocomposites .…”

“…In a sense, the arrangement of the NPs in the array resembles that of the atoms in a crystal cell, where phase-matched SHG signal radiates in specific directions. This principle has been utilized for example on planar structures containing metallic 2D arrays of nanoparticles lacking inversion symmetry, providing coherent addition of the SH field where the efficiency of the process increased rapidly with decreasing nanoparticle size (McMahon et al, 2007;Zheludev et al, 2004). In this context, we demonstrate that, similar to the analysis to derive molecular orientation information of smaller noncentrosymmetic units at interfacial monolayer's or macromolecules systems using SHG/Sum-Frequency Generation (SFG) experiments (Knoesen et al, 2004;Leray et al, 2004;Psilodimitrakopoulos et al, 2009;Campagnola & Loew, 2003;Rocha-Mendoza et al, 2007;Shen, 1989;Zhuang et al, 1999), we can treat the actual submicrometric layer containing randomly arranged, but highly aligned anisotropically shaped Ag-NPs (elongated or nearly spherical), as a nonlinear media; where the origin of its macromolecular second-order susceptibility,   2  , is the coherent contribution of the SH signal induced on every single nanoparticle.…”

Resonant plasmonic nanoparticles for multicolor second harmonic imaging

“…[10][11][12] Among other appealing properties, RPNPs greatly enhance nonlinear optical effects. 13,14 Second harmonic from RPNPs has been recently measured, [15][16][17][18] and different methods to further enhance this nonlinear effect by engineering the RPNPs have been proposed. [19][20][21][22][23] Interestingly, in a recent work, 24 we showed that the SH spectrum generated by RPNPs interacting with sufficiently broadband laser pulses depends on both the laser spectrum and the LSPR.…”