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Evanescent Waves and the Goos-Hänchen Effect

  • Ajoy K. Ghatak
  • K. Thyagarajan
Part of the Optical Physics and Engineering book series (OPEG)

Abstract

The reflection of electromagnetic waves from a dielectric interface is usually studied by assuming the incidence of plane waves having infinite spatial extent; in addition, the radiation is also assumed to be purely monochromatic (see, e.g., Reitz and Milford, 1962). Both these concepts are introduced for simplicity in theoretical considerations. In practice, one encounters a finite-width beam that extends over a finite time and hence does not remain monochromatic. In this chapter we shall study the total internal reflection of a bounded beam by a plane dielectric interface and we shall show that the beam appears to undergo a lateral shift as shown in Fig. 11.1a. This displacement of the beam was experimentally studied by Goos and Hänchen. Hence this effect is called the Goos-Hänchen effect.* This shift cannot be explained from ray-optic considerations and is a consequence of the evanescent field set up in the rarer medium. Since evanescent fields are of great importance in electromagnetic theory,† we thought it worthwhile devoting a chapter to a phenomenon that brings out many salient features associated with the evanescent field.

Keywords

Critical Angle Total Internal Reflection Evanescent Wave Planar Waveguide Poynting Vector 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1978

Authors and Affiliations

  • Ajoy K. Ghatak
    • 1
  • K. Thyagarajan
    • 1
  1. 1.Indian Institute of TechnologyNew DelhiIndia

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