Title :
Analysis of directional grating-coupled radiation in waveguide structures
Author_Institution :
Agilent Labs., Palo Alto, CA, USA
fDate :
7/1/2004 12:00:00 AM
Abstract :
Radiation scattered from diffraction gratings on the surface of waveguides is analyzed using the volume current method. This technique allows the interpretation of the grating elements as scattering centers of the underlying waveguide mode, and radiating sources for the diffracted fields. The framework allows separation of the effects of the grating array global periodicity and the effects of the specific shape of the individual grating elements. A straightforward analogy between the effects of the grating element shape and the behavior of phased-antenna array systems allows a clear and intuitive understanding of the effects of blazed gratings on the directionality of grating-coupled radiation. The analysis is applied to some specific geometries.
Keywords :
antenna phased arrays; diffraction gratings; light diffraction; light scattering; optical arrays; optical planar waveguides; optical waveguide theory; blazed gratings; diffracted fields; diffraction gratings; directional grating-coupled radiation; grating array global periodicity; grating elements; grating-coupled radiation; phased antenna array; radiating sources; radiation scattering; volume current method; waveguide mode; waveguide structures; Arrayed waveguide gratings; Diffraction gratings; Electromagnetic scattering; Electromagnetic waveguides; Optical diffraction; Optical scattering; Optical waveguide theory; Optical waveguides; Phased arrays; Planar waveguides; Dielectric waveguides; electromagnetic radiative interference; gratings; optical diffraction; optical waveguide theory;
Journal_Title :
Quantum Electronics, IEEE Journal of
DOI :
10.1109/JQE.2004.830179
