Abstract : The original device presented in this paper is designed for coupling a free space optical wave under quasi-normal incidence in- and out of- a highly multimode waveguide with minimum losses. It uses two resonant diffraction gratings at the substrate-waveguide interface that are made of a shallow metal grating, covered with a high refractive index layer. It is shown that the resonant structure can theoretically diffract up to 90 % of the incident energy in and out of the waveguiding layer. The geometrical parameters of the structure and the tolerances can easily be achieved by conventional technology means.
https://hal-ujm.archives-ouvertes.fr/ujm-00110870
Contributor : Danièle Blanc-Pélissier
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Submitted on : Thursday, November 2, 2006 - 11:05:16 AM
Last modification on : Friday, September 6, 2019 - 11:14:03 AM
