Reflection of a plane wave

Equations (1) are the von Laue conditions, which apply to the reflection of a plane wave in a crystal. Because of eqs. (1), the momentum normal to the surface changes abruptly from hk to the negative of this value when k terminates on a face of the BZ (Bragg reflection). At a general point in the BZ the wave vector k + bm cannot be distinguished from the equivalent wave vector k, and consequently... 

Figure 4. Two configurations for evanescent wave optics, (a) Top total internal reflection of a plane wave at the base of a glass prism. Bottom the reflectivity R recorded by a detector as a function of the angle of incidence shows the increase to unity at 6, the critical angle for total reflection, (b) ATR setup for the excitation of surface plasmons (PSPs) in Kretschmann geometry. Top a thin metal film (thickness 50 nm) is evaporated onto the base of the prism and acts as resonator driven by the photon field. Bottom the resonant excitation of the PSP wave is seen in the reflectivity curve as a sharp dip at coupling angle 6g.

To model this process, it is instructive to consider first the reflection of a plane wave from a fluid-fluid interface at normal incidence. To this end, we follow a procedure similar to... 

Fig. 10-2 Total internal reflection of a plane wave at a planar interface between semi-infinite media of refractive indices and When = n, the phase change (j) is approximately independent of the direction of E i- - independent of polarization.

---

See also in sourсe #XX -- [ ]

---