Submicron gratings are fabricated holographically on thin film single mode or multimode waveguides.
Thin film waveguides are fabricated by spin-coating polyurethane solution on the substrates of microscope slide glass. In order to characterize them the refractive index and the thickness of thin film are measured by using m-line spectroscopy.
The fabricated gratings are experimented as a grating coupler, a mode converter and a beam splitter. Also chirped gratings are fabricated to observe beam expansion phenomena and the possibility of the wavelength demultiplexing.