We have used the inherent thermochromism of conjugated polymers to investigate substrate heating effects in scanning near-field experiments with metal-coated "apertured" probes. Chemically etched and pulled fibers were used to provide near-field excitation of fully converted films of poly(p-phenylene vinylene), PPV, and of poly(4,4(')-diphenylene diphenylvinylene). We detect no significant blueshift of the photoluminescence spectra generated with near-field excitation, in comparison to those collected with far-field excitation. We conclude that polymer heating in the region contributing to the luminescence is less than 40 K. We also demonstrate that thermolithography of the PPV precursor is not significant by comparing UV (325 nm) and red (670 nm) illumination. (C) 2005 American Institute of Physics.
|Autori interni:||ALLEGRINI, MARIA|
|Autori:||Latini G; Downes A; Fenwick O; Ambrosio A; Allegrini M; Daniel C; Silva C; Gucciardi PG; Patane S; Daik R; Feast WJ; Cacialli F|
|Titolo:||Optical probing of sample heating in scanning near-field experiments with apertured probes RID B-5153-2010 RID F-3894-2011 RID B-4222-2010|
|Anno del prodotto:||2005|
|Digital Object Identifier (DOI):||10.1063/1.1842860|
|Appare nelle tipologie:||1.1 Articolo in rivista|