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Deutsche Physikalische Gessellschaft IOP Institute of Physics

Experimental observation of two-photon photoelectric effect from silver aerosol nanoparticles

M Sipilä1, A A Lushnikov1, L Khriachtchev2, M Kulmala1, H Tervahattu3 and M Räsänen2

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We 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.


PACS

72.40.+w Photoconduction and photovoltaic effects

78.67.Bf Nanocrystals and nanoparticles

61.46.Df Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)

79.60.Jv Interfaces; heterostructures; nanostructures

Subjects

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Nanoscale science and low-D systems

Dates

Issue 10 (October 2007)

Received 21 June 2007

Published 9 October 2007



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