Theory and experiments on grating couplers for thin-film waveguides

A theoretical and experimental study is made of the grating couplers for thin-film waveguides. It is shown that the perturbation series expansion of the field based upon the Green's function approach can actually be summed to all orders to give an expression for the efficiency of grating couple...

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Bibliographic Details
Published in:IEEE journal of quantum electronics 1976-02, Vol.12 (2), p.69-73
Main Authors: Ghizoni, C. C., Bor-Uei Chen, Chung Tang
Format: Article
Language:English
Subjects:
Couplers
Diffraction
Gratings
Optical coupling
Optical propagation
Optical scattering
Optical waveguides
Scanning electron microscopy
Transistors
Waveguide theory
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Summary:A theoretical and experimental study is made of the grating couplers for thin-film waveguides. It is shown that the perturbation series expansion of the field based upon the Green's function approach can actually be summed to all orders to give an expression for the efficiency of grating couplers of arbitrary thickness. The results obtained by this theory are in good agreement with the experimental results obtained. It is also shown that the grating coupling efficiency depends strongly on the grating profile.
ISSN:0018-9197
1558-1713
DOI:10.1109/JQE.1976.1069099