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We report an experimental method for directly imaging optical near-fields of dielectric microspheres upon illumination with ultraviolet nanosecond laser pulses. The intensity distribution is imprinted in chalcogenide films leaving behind a characteristic fingerprint with features below 200 nm in size, which we read out with high-resolution field emission scanning electron microscopy. The experimental results are well matched by a rigorous solution of Maxwell’s equations. Compared to previous works using infrared femtosecond laser pulses, the use of ultraviolet nanosecond pulses is identified to be superior in terms of minimum recordable features size and surface roughness of the imprint.
American Institute of Physics
Publication date: 
10 May 2010

Jan Siegel, D Puerto, J Solis, Francisco Javier García de Abajo, Carmen N Afonso, M Longo, Claudia Wiemer, M Fanciulli, Paul Kühler, Mario Mosbacher, Paul Leiderer

Biblio References: 
Volume: 96 Issue: 19 Pages: 193108
Applied physics letters