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Front-coupling of a prefocused x-ray beam into a monomodal planar waveguide
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View: Figures


Image of FIG. 1.
FIG. 1.

Experimental setup: The waveguide is located in the focus of a Kirkpatrick–Baez mirror system with high flux enhancement. The far-field diffraction pattern behind the waveguide is measured at a distance of . A simulation of the electric field inside the sample shows how a plane wave incident from the left is strongly absorbed in the cladding while the absorption in the guiding layer ) is much lower. Lengths and angles are not to scale.

Image of FIG. 2.
FIG. 2.

Measured far-field pattern (filled squares) compared to corresponding simulations: (i) planar diffraction from an aperture of the same size as the waveguide (dotted line); (ii) ideal waveguide without imperfections (solid line); and (iii) far-field pattern assuming a small Si terrace at the waveguide exit due to imperfect cleaving (dashed line).

Image of FIG. 3.
FIG. 3.

Variation of the angle of incidence shifts the angular position of the far field with respect to the primary beam by the same amount. The intensity decreases significantly when the angle of incidence is changed by 0.03° above (filled diamonds) or below (filled triangles) the optimal position (filled circles) of normal incidence.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Front-coupling of a prefocused x-ray beam into a monomodal planar waveguide