M Sipilä et al 2007 New J. Phys. 9 368 doi:10.1088/1367-2630/9/10/368
M Sipilä1, A A Lushnikov1, L Khriachtchev2, M Kulmala1, H Tervahattu3 and M Räsänen2
Show affiliationsWe report on the observation of two-photon electron emission from silver nanoparticles suspended in nitrogen flow resulting from irradiating them with continuous wave and pulsed laser light with photon energies below the threshold of the single-photon photoelectric effect. The photoelectron yield is quadratic in the light intensity, and the two-photon electron emission threshold is evident. The efficiency of the two-photon photoelectric effect is determined for nanoparticles of various sizes. These experiments offer the net information on nonlinear quantum properties of an isolated single nanoparticle which is crucial for developing theoretical models.
72.40.+w Photoconduction and photovoltaic effects
Condensed matter: electrical, magnetic and optical
Issue 10 (October 2007)
Received 21 June 2007
Published 9 October 2007
M Sipilä et al 2007 New J. Phys. 9 368
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