title: Double groove broadband gratings.
abstract: Waveguiding in periodical structures of the size of the wavelength is applied to increase the functional spectral band of diffractive optics. The deviation of the effective refractive index between waveguides as a function of the wavelength is utilized to compensate the strong wavelength dependence of the efficiency of diffraction gratings.
authors.affiliation: Department of Physics and Mathematics, University of Joensuu, Joensuu, Finland. juha.pietarinen@nanocomp.fi
authors.forename: Juha
authors.initials: J
authors.lastname: Pietarinen
authors.forename: Tuomas
authors.initials: T
authors.lastname: Vallius
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008962:Models, Theoretical; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation