Role of surface plasmon in second harmonic generation from gold nanorods

Abstract

The role of surface plasmon in second harmonic generation from arrays of gold nanorod particles excited by femtosecond laser pulses is investigated as a function of incident light polarization and irradiation wavelength. In addition to photoluminescence, a peak of second harmonic is observed and is found to depend on the polarization and wavelength of the fundamental frequency laser beam. In particular, the authors found similarities between extinction spectra of the nanoparticles and spectra of emmitted second harmonic. This behavior can be explained by resonant excitation of localized surface plasmon resonances.

Ablation of nanoparticles and efficient harmonic generation using a 1-kHz laser

“…The cross section of recombination of the accelerated electron with the parent ion is higher for clusters than for atoms [20]. Also investigated are the effect on HG efficiency of the local field enhancement in the cluster vicinity, and of the plasmonic properties of nanoparticles and nanoantennas in gaseous media [21][22][23][24]. In particular, the increase of HHG generation efficiency due to surface plasmon resonance (SPR) effects was demonstrated in fullerene media [25,26].…”

Nonlinear optics on nano/micro-hierarchical structures on metals: focus on symmetric and plasmonic effects

“…Extensive nanostructures from Figure 3(e) were observed on top of the LIPSSs. It is known that localized SPs can be generated from nanostructures [24,47,48], and the localized SPs, if they exist, may generate an isotropic SHG enhancement in the p -in/ p -out polarization configuration. Here, we believe that the non-zero SHG components around φ  = 90° and 270° in Figure 8(b) arise from SHG enhancement due to the localized SPs.…”

“…If so, 10 independent nonlinear susceptibility elements should be permitted and thus real χ (2) YYY for the s -in/ s -out polarization configuration should be accepted [2,5]. The other candidate is that the χ (2) YYY panel can be induced under C 4 v symmetry in a specific configuration [17], or the shape of the microcubes has broken symmetry at the air–metal interface [24]. However, the consideration of the E field of the incident light being converted from s - to p -polarization by a polarization scrambling effect [6,45] is plausible as one of the candidates.…”

“…They found that the diffracted SHG was enhanced at a specific incident angle. Also, Baida et al [23] and Hubert et al [24] have focused on studying SHG enhanced by localized SPs on metal nanostructures. They found that the SHG was enhanced at a specific incident wavelength.…”

Surface plasmon polariton assisted optical switching in noble bimetallic nanoparticle system

“…This opens an affluence of prospects in lithography or imaging at the nanoscale through the use of soft x-rays. In fact, SPR induced localized SHG using Au nanoparticles are well studied system [24][25][26]. Among many such significant phenomena and applications, the most well known is the giant surface-enhanced Raman scattering (SERS) [27] or noble metal coated tip enhanced Raman scattering (TERS) [28] those allow both detection, and spectroscopic imaging of a single molecule [29].…”