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Figure 1
The electromagnetic field intensity pattern inside a polymer (calixarene) waveguide of thickness d = 57 nm in Si was calculated using a Crank–Nicolson-like finite-difference scheme (Scarmozzino & Osgood, 1991BB15) solving the parabolic wave equation (Kopylov et al., 1995BB10). The X-ray beams with E = 10 keV and E = 15 keV, respectively, arrive from above left with an angle of incidence αi = 0.03°. The dashed lines indicate the interfaces between the guiding layer and the cladding. The calculations show how the interference pattern inside the waveguide is stretched in the propagation direction with increasing photon energy. Furthermore, owing to the lower absorption at higher energies, a standing wave corresponding to the specularly reflected beam is visible in the cladding above the guiding layer at E = 15 keV.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 13| Part 1| December 2006| Pages 69-73
doi:10.1107/S0909049505038008
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