Abstract

Nonspecular phenomena involving Gaussian beams reflected at a dielectric interface include the well-known lateral displacement, the more recently investigated focal and angular shifts, and a fourth newly recognized effect termed beam-waist modification. In the past, expressions for the magnitudes of these effects have been obtained for incidence angles θ_i that are not too close to the critical angle of total reflection θ_c, but results for θ_i near θ_c have been reported only for lateral displacement. We have therefore examined all the four effects and derived explicit expressions that hold for arbitrary values of θ_i in the vicinity of θ_c. These expressions are consistent with the results obtained by others for θ_i ≠ θ_c as well as with those for the lateral displacement around θ_i= θ_c. We find that the nonspecular effects are finite at θ_c, and we include a set of universal curves to clarify the behavior and interrelations of these phenomena.

© 1987 Optical Society of America

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