The relationship between the Poynting vector and the dispersion surface in the Bragg case

Abstract

The relationship between the Poynting vector and the dispersion surface in the symmetrical Bragg case is studied in detail. It is found that the Poynting vector is not normal to the real part of the dispersion surface in the so-called `total reflection' region, even when the contribution of the imaginary part of the scattering factor to the diffraction is negligible. Unlike that in the Laue case, the deviation in the Bragg case becomes least when the diffraction is induced only by the imaginary part of the scattering part near the absorption edge.

Energy and Momentum Considerations in an Ideal Solenoid

“…The electromagnetic Poynting vector has long been of considerable interest over the years [1][2][3][4][5][6][7][8][9]. This is so because it is directly related to the electromagnetic (EM) energy flux and the electromagnetic linear momentum.…”