TY - JOUR
T1 - Thin element approximation for the analysis of blazed gratings
T2 - Simplified model and validity limits
AU - Levy, Uriel
AU - Marom, Emanuel
AU - Mendlovic, David
PY - 2004/1/2
Y1 - 2004/1/2
N2 - The thin element approximation is widely used to predict the diffraction efficiency of thin periodic diffractive optical elements (DOEs). However, as the period-to-wavelength ratio is reduced, the approximation becomes inaccurate. A model based on a "shadow concept" can be used to predict the diffraction efficiency with high accuracy. Hereby we extend the model to include the effect of multi-level staircase structures and non-perpendicular incident angles. We also present an error map and define regions of validity for the thin element approximation (TEA) and the shadow model.
AB - The thin element approximation is widely used to predict the diffraction efficiency of thin periodic diffractive optical elements (DOEs). However, as the period-to-wavelength ratio is reduced, the approximation becomes inaccurate. A model based on a "shadow concept" can be used to predict the diffraction efficiency with high accuracy. Hereby we extend the model to include the effect of multi-level staircase structures and non-perpendicular incident angles. We also present an error map and define regions of validity for the thin element approximation (TEA) and the shadow model.
KW - Blazed gratings
KW - Diffraction
UR - http://www.scopus.com/inward/record.url?scp=0346962746&partnerID=8YFLogxK
U2 - 10.1016/j.optcom.2003.10.017
DO - 10.1016/j.optcom.2003.10.017
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
AN - SCOPUS:0346962746
SN - 0030-4018
VL - 229
SP - 11
EP - 21
JO - Optics Communications
JF - Optics Communications
IS - 1-6
ER -