Title :
Imaging of second harmonic generation in the near field of ellipsoidal gold nanoparticles
Author :
Zavelani-Rossi, M. ; Celebrano, M. ; Polli, D. ; Biagioni, P. ; Finazzi, M. ; Duò, L. ; Svelto, O. ; Cerullo, G. ; Labardi, M. ; Allegrini, M. ; Grand, J. ; Adam, P.M.
Author_Institution :
Politecnico di Milano, Milan
Abstract :
In this paper, a nonlinear aperture SNOM is used. It is based on a hollow pyramid tip, providing polarized high-peak-intensity femtosecond light pulses in the near field. Second harmonic (SH) images from single gold nanoellipsoids with various aspect ratio are obtained, with high contrast and sub-100-nm spatial resolution. The nonlinear response strongly depends on both LSP resonances and particle morphology. Moreover simultaneous acquisition of both FW and SH provides clear and unambiguous information on scattering, absorption and re-emission processes at the particles.
Keywords :
gold; high-speed optical techniques; nanoparticles; near-field scanning optical microscopy; optical harmonic generation; Au; LSP resonances; aspect ratio; ellipsoidal gold nanoparticles; gold nanoellipsoids; nonlinear aperture SNOM; nonlinear response; particle morphology; polarized high-peak-intensity femtosecond light pulses; scanning near-field optical microscopy; second harmonic generation; Absorption; Apertures; Frequency conversion; Gold; Morphology; Nanoparticles; Optical polarization; Particle scattering; Resonance light scattering; Spatial resolution;
Conference_Titel :
Lasers and Electro-Optics, 2007 and the International Quantum Electronics Conference. CLEOE-IQEC 2007. European Conference on
Conference_Location :
Munich
Print_ISBN :
978-1-4244-0931-0
Electronic_ISBN :
978-1-4244-0931-0
DOI :
10.1109/CLEOE-IQEC.2007.4387044
