Surface-Enhanced Optical Third-Harmonic Generation in Ag Island Films

Abstract

Surface-enhanced optical third-harmonic generation (THG) is observed in silver island films. The THG intensity from Ag nanoparticles is enhanced by more than 2 orders of magnitude with respect to the THG intensity from a smooth and homogeneous silver surface. This enhancement is attributed to a local plasmon excitation and resonance of the local field at the third-harmonic wavelength. The diffuse and depolarized component of the enhanced THG is associated with the third-order hyper-Rayleigh scattering in a two-dimensional random array of silver nanoparticles.

Solving surface plasmon resonances and near field in metallic nanostructures: Green’s matrix method and its applications

“…s→s n , the electric fields diverge to infinity. Those eigenstates (or resonances) with the strong near field are meaningful and have some applications [8,[10][11][12][13]16,17,42].…”

“…The resonance frequency and intensity are dominated by the distribution of the polarization charge across the nanostructure [7]. This resonant enhancement has promoted many important applications, such as surface-enhanced Raman scattering [8], *Corresponding author (email: qhgong@pku.edu.cn) biosensors and nanometer plasmonic waveguides [9-12], optical antennas [13], solar cells [14,15], nonlinear optical frequency mixing [16][17][18] and so on.Currently, we can see a rapidly expanding array of metallic nanostructures. With the development of nanofabrication and nanolithography techniques, various metallic nanoparticles, such as nanospheres, nanoshells, nanorices, nanorings, nanostars, nanocages and nanotriangles, have been successfully fabricated [9].…”

Interplay of plasmon resonances in binary nanostructures

“…Only those eigenstates (or resonances) with strong electric near field are physically meaningful and have some applications [1][2][3][4][5][6][7]. To select those SPRs, we have defined the resonance capacity based on the internal energy of the nanostructures [17].…”

Controlling plasmonic resonances in binary metallic nanostructures

“…Only those eigenstates ͑or resonances͒ with strong near electric fields are physically meaningful. [1][2][3][4][5][6][7][8] To select those SPRs, we have defined the resonance capacity in the function of the internal energy of the nanostructures. 19 In binary nanostructures, for each s n , the joint resonance capacity is …”

“…[6][7][8] In practice, it is necessary to adjust the resonance wavelength as well as to design the enhanced near field. There are several ways of approaching this problem.…”