Narrow-linewidth bandpass filters with diffractive thin-film layers.
Narrow-linewidth bandpass filters with diffractive thin-film layers.
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DOI：
10.1364/ol.26.000584
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发表时间：
2001-05
期刊：
影响因子：
3.6
通讯作者：
Sorin Tibuleac;Robert Magnusson
中科院分区：
文献类型：
--
作者：
Sorin Tibuleac;Robert Magnusson
利用遗传算法搜索和优化程序，得到了基于波导-光栅结构中导模共振效应的带通滤波器。计算实例表明，在层数较少的薄膜衍射器件中，可以实现窄线宽、高峰值、低边带透过率。介绍了一种中心波长为0.55微米、线宽为0.2 nm的双层双光栅结构的滤光片。在10.6微米波长下，得到了一个线宽为12.7 nm、扩展的低边带透过率的二元光栅滤光片。一个带有表面浮雕硅光栅和两层SiO(2)和Si的三层器件产生了一个中心为1.55微米、线宽为0.1 nm的高效滤光片。
Bandpass filters based on guided-mode resonance effects in waveguide-grating structures are obtained by use of a genetic algorithm search-and-optimization routine. Calculated examples show that narrow linewidths, high peaks, and low sideband transmittances can be achieved in thin-film diffractive devices with few layers. A filter with a linewidth of 0.2 nm at a central wavelength of 0.55 microm is demonstrated in a two-layer-two-grating structure. At 10.6-microm wavelength, a filter consisting of a single binary grating is obtained that has a linewidth of 12.7 nm and extended, low sideband transmittance. A three-layer device with a surface relief Si grating and two underlying homogeneous layers of SiO(2) and Si yields a high-efficiency filter centered at 1.55 microm with a linewidth of 0.1 nm.