1.
Opt Lett
; 35(16): 2774-6, 2010 Aug 15.
Article
in English
| MEDLINE
| ID: mdl-20717453
ABSTRACT
We designed, fabricated, and characterized three-level transmission gratings in the resonance domain with reduced shadowing losses based on a three-wave interference mechanism. A new technological approach allows for fabrication of homogeneous and large area multilevel gratings without spurious artifacts. To our knowledge, the measured efficiency of 86% exhibits the largest value yet reported for a multilevel transmission grating in the resonance domain close to normal incidence.