Open AccessWideband four-level transmission gratings with flattened spectral efficiency
Author(s) -
Juha Pietarinen,
Tuomas Vallius,
Jari Turunen
Publication year - 2006
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.14.002583
Subject(s) - optics , grating , wideband , diffraction efficiency , octave (electronics) , diffraction grating , materials science , transmission (telecommunications) , wavelength , rigorous coupled wave analysis , diffraction , parametric statistics , blazed grating , physics , telecommunications , computer science , mathematics , statistics
Four-level transmission-type surface relief grating profiles with nearly flat efficiency over a spectral octave are designed by rigorous electromagnetic diffraction theory. Parametric optimization of the relief depths and transition points of the profile steps of these leads to efficiencies in the range 50-60% over the entire octave if the ratio of the grating period and the mean spectral wavelength is greater than ~ 3.