Resonant grating filters are promising components for free-space narrowband filtering. Unfortunately, dueto their weak angular tolerance, their performances are strongly deteriorated when they are illuminated with a standard collimated beam. Yet this problem can be overcome by resorting to a complex periodic pattern known as the doubly periodic grating [Lemarchand et al., Opt. Lett. 23, 1149 (1998)]. We report what we believe to be the first experimental fabrication and characterization of a bidimensional doubly periodic grating filter. We obtained a 0.5 nm bandpass polarization independent reflection filter for telecom wavelengths (1520-1570 nm) that presents a transmittivity minimum of 18percent with a standard incident collimated beam.
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机译：谐振光栅滤波器是用于自由空间窄带滤波的有希望的组件。不幸的是，由于它们的弱角度公差，当用标准准直光束照明时，它们的性能会大大降低。然而，可以通过诉诸称为双重周期性光栅的复杂周期性图案来克服这个问题[Lemarchand et al。，Opt。来吧23，1149（1998）]。我们报告了我们认为是二维双周期光栅滤波器的第一个实验性制造和表征。我们获得了一个针对电信波长（1520-1570 nm）的0.5 nm带通偏振独立反射滤波器，该滤波器在标准入射准直光束下的透射率最小值为18％。
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