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.

Siegel, J., Puerto, D., Solis, J., Garc('i)a De Abajo, F.j., Afonso, C.n., Longo, M., et al. (2010). Ultraviolet optical near-fields of microspheres imprinted in phase change films. APPLIED PHYSICS LETTERS, 96(19) [10.1063/1.3428582].

Ultraviolet optical near-fields of microspheres imprinted in phase change films

Longo, M.;
2010-01-01

Abstract

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.
2010
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/03
English
Con Impact Factor ISI
Maxwell equations; Crystalline solids; Electrical resistivity; Amorphous materials; Optical constants; Scanning electron microscopy; Nanodots; Diffraction optics; Femtosecond lasers; Chemical processes
Siegel, J., Puerto, D., Solis, J., Garc('i)a De Abajo, F.j., Afonso, C.n., Longo, M., et al. (2010). Ultraviolet optical near-fields of microspheres imprinted in phase change films. APPLIED PHYSICS LETTERS, 96(19) [10.1063/1.3428582].
Siegel, J; Puerto, D; Solis, J; Garc('i)a De Abajo, Fj; Afonso, Cn; Longo, M; Wiemer, C; Fanciulli, M; K(\,
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/350063
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