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Near-field optical studies of local photomodification in nanostructured materials
W D Bragg1, V P Safonov, W Kim
1Department of Physics, New Mexico State University, Las Cruces 88003, USA.
Journal of Microscopy
|June 5, 2001
Abstract:
Fractal aggregates of silver nanoparticles are studied experimentally using atomic force microscopy and photon scanning tunnelling microscopy. Large changes in the near-field optical response of fractal aggregates are observed after the irradiation of samples with nanosecond laser pulses. The threshold energy density for photomodification using a 532 nm laser is measured to be 9 mJ cm(-2). It is shown that photomodification-induced changes in the local optical response can be two orders of magnitude larger than changes in far-field absorption.