Title :
Resonances of asymmetric dielectric waveguides containing a diffraction grating
Author :
Wang, S.S. ; Magnusson, R.
Author_Institution :
Dept. of Electr. Eng., Texas Univ., Arlington, TX, USA
Abstract :
Guided-wave resonances in periodically modulated asymmetric dielectric waveguides are studied by means of the rigorous coupled-wave theory. The resonances in the i=-1 order wave amplitudes evaluated at z=0 and z=d/ Lambda (where d/ Lambda =5) are shown as a function of the external angle of incidence. The waveguide is asymmetric with epsilon /sub 1/=1, epsilon /sub 0/=2, epsilon /sub 3/=1.9, and a modulation index of Delta epsilon / epsilon /sub 0/=0.005/sub ./ The resonant wave amplitudes at the two interfaces are well separated due to the asymmetry of the waveguide. It is shown how the resonances couple to the propagating diffracted waves with adjacent order numbers. A high degree of switching is observed between the transmitted wave, DE/sub 30/, and the reflected one, DE/sub 10/. However, this occurs over a very small angular range of the input wave.<>
Keywords :
dielectric waveguides; diffraction gratings; optical waveguide theory; resonance; angular range; asymmetric dielectric waveguides; coupled-wave theory; diffraction grating; guided wave resonances; input wave; modulation index; propagating diffracted waves; reflected wave; resonant wave amplitudes; transmitted wave; Dielectric losses; Diffraction gratings; Electromagnetic diffraction; Electrooptical waveguides; Optical reflection; Partial differential equations; Permittivity; Region 1; Resonance; Waveguide theory;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1990. AP-S. Merging Technologies for the 90's. Digest.
Conference_Location :
Dallas, TX, USA
DOI :
10.1109/APS.1990.115136
