Transmission and Reflection Grating coupled Optical Waveguide Structures

Abstract

The use of dielectric gratings over thin-film waveguide sructures to couple an incident surface wave into guided beam has been assessed. Guiding optical energy incident on surface of Grating coupled optical planar waveguide structures are presented with emphasis on the characteristics of different grating materials and structural parameters. Perturbation analysis of symmetric gratings that transfer energy of an incident beam into waveguide structures has been discussed with the help of macroscopic characterisation of the guiding properties. The pertinent transmission characteristics is investigated for planar waveguide structures with gratings having linear rectangular profiles using this analytical approach. These are essential considerations for design and optimization of devices for optical networking and communication and various other applications in fields of optoelectronics, medicine and optical sensing. An analysis of grating waveguide structures for transmission, reflection and absorption modes of operation is presented. Based on the observations and results, one can model grating coupled waveguide structures for different wavelengths and applications.