Non-thermal desorption/ablation of molecular solids induced by ultra-short soft x-ray pulses - École polytechnique Access content directly
Journal Articles Optics Express Year : 2008

Non-thermal desorption/ablation of molecular solids induced by ultra-short soft x-ray pulses

L. Juha
  • Function : Author
J. Cihelka
  • Function : Author
Stéphane Sebban
C. Valentin
Philippe Zeitoun

Abstract

We report the first observation of single-shot soft x-ray laser induced desorption occurring below the ablation threshold in a thin layer of poly (methyl methacrylate) - PMMA. Irradiated by the focused beam from the Free-electron LASer in Hamburg (FLASH) at 21.7nm, the samples have been investigated by atomic-force microscope (AFM) enabling the visualization of mild surface modifications caused by the desorption. A model describing non-thermal desorption and ablation has been developed and used to analyze single-shot imprints in PMMA. An intermediate regime of materials removal has been found, confirming model predictions. We also report below-threshold multiple-shot desorption of PMMA induced by high-order harmonics (HOH) at 32nm. Short-time exposure imprints provide sufficient information about transverse beam profile in HOH's tight focus whereas long-time exposed PMMA exhibits radiation-initiated surface ardening making the beam profile measurement infeasible.

Dates and versions

hal-00508903 , version 1 (06-08-2010)

Identifiers

Cite

J. Chalupsky, L. Juha, V. Hájková, J. Cihelka, L. Vyšín, et al.. Non-thermal desorption/ablation of molecular solids induced by ultra-short soft x-ray pulses. Optics Express, 2008, 17 (1), pp.208-217. ⟨10.1364/OE.17.000208⟩. ⟨hal-00508903⟩
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