DocumentCode :
932493
Title :
Beam scattering by nonuniform leaky-wave structures
Author :
Saad, Abraham ; Bertoni, Henry L. ; Tamir, Theodor
Author_Institution :
Ministry of Defence, Israel
Volume :
62
Issue :
11
fYear :
1974
Firstpage :
1552
Lastpage :
1561
Abstract :
A method is presented for obtaining the scattered field due to a beam incident on a layered structure or on a dielectric grating whose properties vary slowly along a longitudinal direction. The scattered field is expressed in terms of a Green´s function whose form is particularly simple for a large class of practical problems involving laser beams incident on structures capable of guiding leaky waves. The incident beam may then strongly couple to the leaky wave, thus producing a scattered field that contains a specularly reflected component and a diffracted component of the leaky-wave type. The presence of the latter component may cause the resulting scattered field to be considerably different from the field of the incident beam. A judicious choice of the leaky-wave structure can be used to produce a scattered field that exhibits any of a wide range of distributions. The method developed herein is illustrated by means of structures whose leakage-properties vary linearly. The results can be utilized either for efficiently coupling a beam into a surface wave, or for splitting the incident beam into two separate but closely similar outgoing beams, both applications being discussed in detail.
Keywords :
Contracts; Couplers; Dielectrics; Gratings; Integrated optics; Laser beams; Optical coupling; Optical scattering; Optical surface waves; Surface waves;
fLanguage :
English
Journal_Title :
Proceedings of the IEEE
Publisher :
ieee
ISSN :
0018-9219
Type :
jour
DOI :
10.1109/PROC.1974.9662
Filename :
1451592
Link To Document :
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