브루스터 각: 두 판 사이의 차이

 

빛이 [[굴절률]]이 다른 두 [[매질]] 사이를 지날 때, 보통 그 경계면에서 [[반사]]가 일어난다. 하지만, 어떤 [[편광]]상태의 빛이 특정한 [[입사각]]으로 입사되면 경계면에서 반사되지 않는데, 이 특정한 입사각이 브루스터 각 <math>\theta_{B}\,</math>이다.

 

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The physical mechanism for this can be qualitatively understood from the manner in which electric [[dipole]]s in the media respond to ''p''-polarized light. One can imagine that light incident on the surface is absorbed, and then reradiated by oscillating electric dipoles at the interface between the two media. The polarization of freely propagating light is always perpendicular to the direction in which the light is travelling. The dipoles that produce the transmitted (refracted) light oscillate in the polarization direction of that light. These same oscillating dipoles also generate the reflected light. However, dipoles do not radiate any energy in the direction along which they oscillate. Consequently, if the direction of the refracted light is perpendicular to the direction in which the light is predicted to be [[specular reflection|specularly reflected]], the dipoles will not create any reflected light. Since, by definition, the ''s''-polarization is parallel to the interface, the corresponding oscillating dipoles will always be able to radiate in the specular-reflection direction. This is why there is no Brewster's angle for ''s''-polarized light.

The concept of a polarizing angle can be extended to the concept of a Brewster wavenumber to cover planar interfaces between

two linear bianisotropic materials.

 

==References==

*A. Lakhtakia, 'General schema for the Brewster conditions,' Optik, Vol. 90, pp. 184-186 (1992).

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