Time-resolved second-harmonic generation from gold nanoparticle arrays

D. W. Ferrara; K. A. Tetz; M. D. McMahon; R. F. Haglund Jr.

doi:10.1117/12.735337

22 September 2007 Time-resolved second-harmonic generation from gold nanoparticle arrays

D. W. Ferrara, K. A. Tetz, M. D. McMahon, R. F. Haglund Jr.

Proceedings Volume 6641, Plasmonics: Metallic Nanostructures and Their Optical Properties V; 664112 (2007) https://doi.org/10.1117/12.735337
Event: NanoScience + Engineering, 2007, San Diego, California, United States

Abstract

We have studied the effects of planar inversion symmetry and particle-coupling of gold nanoparticle (NP) arrays by angle dependent second-harmonic generation (SHG). Time- and angle- resolved measurements were made using a mode-locked Ti:sapphire 800 nm laser onto gold NP arrays with plasmon resonance tuned to match the laser wavelength in order to produce maximum SHG signal. Finite-difference time domain simulations are used to model the near-field distributions for the various geometries and compared to experiment. The arrays were fabricated by focused ion-beam lithography and metal vapor deposition followed by standard lift-off protocols, producing NPs approximately 20nm high with various in-plane dimensions and interparticle gaps. Above a threshold fluence of ~ 7.3 × 10^-5 mJ/cm² we find that the SHG scales with the third power of intensity, rather than the second, and atomic-force microscopy shows that the NPs have undergone a reshaping process leading to more nearly spherical shapes.

Citation Download Citation

D. W. Ferrara, K. A. Tetz, M. D. McMahon, and R. F. Haglund Jr. "Time-resolved second-harmonic generation from gold nanoparticle arrays", Proc. SPIE 6641, Plasmonics: Metallic Nanostructures and Their Optical Properties V, 664112 (22 September 2007); https://doi.org/10.1117/12.735337

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