Influence factors on sensitivity in
design of narrow bandpass filter band
1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. State Key Laboratory for Mechanical Behavior of Materials, Xi′an Jiaotong University, Xi′an, Shaanxi 710049, China
Abstract： For designing narrow bandpass filter, better narrowband filter can be obtained by changing some parameters, but some theoretical designs are different with preparation results. To reveal the relationship between design and preparation, the simulation experiments were carried out with Essential Macleod software. The effects of high and low refractive index interval layer, number of reflectors, interference order and number of cavities on the sensitivity of narrow bandpass filter design and preparation were analyzed. The results show that the steepness can be improved with increased half bandwidth and rectangularity when the number of mirror layers is increased. The sensitivities of thin film narrow bandpass filters with both high and low refractive index cavity layer are increased, and the fabrication difficulty is increased. With the increasing of interference orders,the steepness is improved with decreased half bandwidth and increased rectangularity, and the sensitivity of thin film narrow bandpass filters cannot be affected. Using low refractive index material as cavity layer, the sensitive layers (cavity layer) can increase the thickness error and the fabrication difficulty with the increasing of interference orders. With the increasing of the number of cavities, the steepness can be improved with increased half bandwidth and rectangularity. The sensitivity of thin film narrow bandpass filters cannot be affected with high refractive index materials as cavity layer, while it is increased with low refractive index materials as cavity layer.
2018, Vol. 39 
