Optical force enhanced by plasmon resonance allowing position-sensitive synthesis and immobilization of single Ag nanoparticles on glass surfaces

Itoh, Tamitake; Biju, Vasudevanpillai; Ishikawa, Mitsuru; Ito, Syoji; Miyasaka, Hiroshi
April 2009
Applied Physics Letters;4/6/2009, Vol. 94 Issue 14, p144105
Academic Journal
Focused laser light in an aqueous solution of silver nitrate and disodium citrate allowed the synthesis and immobilization of single Ag particles on a glass surface. The as-synthesized Ag particles were free from aggregation. Rayleigh scattering spectra of the Ag particles showed a plasmon resonance band at ∼490 nm. Analysis of the spectra revealed that the Ag particles have oblate-spindle shapes with ∼30 nm diameter. The polarizability of the Ag nanoparticles demonstrated that soon after the formation of the particles at the focal point, optical force repels them out of the focal point and immobilizes on the glass surface.


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