SPECTRAL SHIFTS AND LINE-SHAPES ASYMMETRIES IN THE RESONANT RESPONSE OF GRATING WAVE-GUIDE STRUCTURES

The resonant spectral response that grating-waveguide structures displ ay in the transmitted and reflected intensities, is analyzed with the aid of a newly developed wave interference model. The resonant respons e is shown to be generally accompanied by wavelength shifts for the tr ansmitted and reflected intensities, resulting in asymmetric resonance line-shapes. A simple rule that relates the ratio of these resonant s hifts to the reflected intensity from the structure away from resonanc e is obtained. The predicted results from the model were confirmed exp erimentally viith both dielectric as well as metal based grating-waveg uide structures. (C) 1998 Elsevier Science B.V.