Goossens Thomas
Opt Lett. 2022 Aug 1;47(15):3920-3923. doi: 10.1364/OL.462725.
Patterned thin-film Fabry-Pérot filters are used to develop compact spectral cameras. Recent articles report on crosstalk in such devices, raising concerns regarding spectral and spatial resolution. It has been suggested that light entering a filter might spill over to neighboring filters but this has not yet been analyzed in detail. The proposed mechanism in this Letter is that the Fabry-Pérot filters act as coupled waveguides that can propagate crosstalk above the pixel array. The results show that the crosstalk can be asymmetric, enabling elimination by rearranging the filters on the sensor. Interestingly, the logical strategy where crosstalk to all neighbors is eliminated appears suboptimal due to additional resonances. These findings reveal untapped opportunities for developing better sensors and a corresponding need for further systematic investigations.
图案化薄膜法布里-珀罗滤波器被用于开发紧凑型光谱相机。近期的文章报道了此类设备中的串扰问题，引发了对光谱和空间分辨率的担忧。有人提出进入一个滤波器的光可能会溢出到相邻滤波器，但这尚未得到详细分析。本文提出的机制是，法布里-珀罗滤波器充当耦合波导，能够在像素阵列上方传播串扰。结果表明，串扰可能是不对称的，通过重新排列传感器上的滤波器可以消除串扰。有趣的是，消除与所有相邻滤波器的串扰这一逻辑策略由于额外的共振而显得并非最优。这些发现揭示了开发更好传感器的未被挖掘的机会以及进行进一步系统研究的相应需求。
