Coherent Propagation of X Rays in a Planar Waveguide with a Tunable Air Gap

Advances in fabrication of X-ray waveguides

“…While waveguide (WG) optics is ubiquitous in the visible and infrared spectral range, it is still much less developed in the x-ray regime, despite some encouraging initial work on planar x-ray WGs [1,2,3,4,5,6,7,8]. This is for a good reason.…”

Advanced Channeling Technologies in Plasma and Laser Fields

“…Numerical simulations [64,65] have shown that carbon nanotubes will act as soft X-ray waveguides and support modes of propagation when coated with various materials [66]. Other researchers have already demonstrated experimentally the coherent propagation of X-rays in a planar waveguide with a tunable air gap [67]. The angular dependence of the intensity of characteristic K α radiation in carbon vs the aligned carbon nanotubes orientation suggests the possibility of X-ray channeling as well as radiation diffraction on nanotube multiwalls [68].…”

On X-ray waveguiding in nanochannels: Channeling formalism

“…Numerical simulations [7,8] have shown that carbon nanotubes will act as soft X-ray waveguides and support modes of propagation when coated with various materials [9]. Other researchers have already demonstrated experimentally the coherent propagation of X-rays in a planar waveguide with a tunable air gap [10]. The angular dependence of the intensity of C K α radiation vs the aligned carbon nanotubes' orientation suggests the possibility of X-ray channeling as well as radiation diffraction on nanotube multiwalls [11].…”

“…Neglecting absorption, in case of a planar waveguide with the guide channel diameter d, the solution of the wave equation (3) gives for ϑ < ϑ c (≪ 1) [10] …”

“…is achieved [10,24,25,26,27,28,29,30,31]. Additional to the planar case, in paper [27] the authors have proposed a wave theory of X-ray propagation through a circular guide.…”