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Perturbation to the resonance modes by gold nanoparticles in a thin-film-based x-ray waveguide

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6 Author(s)
Lee, D.R. ; Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 ; Hagman, A. ; Li, Xuefa ; Narayanan, S.
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We demonstrate, for the first time, that the resonance modes in a thin-film-based x-ray waveguide are extremely sensitive to the electron density distribution in the thin film. The resonance modes can be effectively altered by diffusion of a gold nanoparticle submonolayer embedded in the waveguide. Such a perturbation can be observed with dramatic change in x-ray reflectivity and fluorescence data in the low-angle (≪0.5°) resonance regime. Conversely, the quantitative analysis of the perturbation to the resonance modes, x-ray reflectivity, as well as the resonantly excited x-ray fluorescence from gold nanoparticles can be exploited to accurately determine the absolute gold distribution within the profile of the thin-film-based waveguide with subnanometer resolution.

Published in:

Applied Physics Letters  (Volume:88 ,  Issue: 15 )

Date of Publication:

Apr 2006

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