Optical probing of sample heating in scanning near-field experiments with apertured probes
- Department of Physics and Astronomy and London Centre for Nanotechnology, University College London, Gower Street, WC1E 6BT, London (United Kingdom)
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{sup '}-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.
- OSTI ID:
- 20636794
- Journal Information:
- Applied Physics Letters, Vol. 86, Issue 1; Other Information: DOI: 10.1063/1.1842860; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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