Terahertz sensing with high sensitivity and substance identification capability using a novel High-quality resonance supported by a thin structured silicon film
Terahertz sensing with high sensitivity and substance identification capability using a novel High-quality resonance supported by a thin structured silicon film
复制标题
使用薄结构硅膜支持的新型高质量谐振，具有高灵敏度和物质识别能力的太赫兹传感
DOI：
10.1016/j.optlastec.2022.108177
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Zhanghua Han
中科院分区：
文献类型：
--
作者：
Min Sun;Esha Maqbool;Zhanghua Han
基于太赫兹光谱技术，提出并数值研究了一种新型的具有高灵敏度和物质选择性的气体传感结构，该结构采用了一种新型的高质量谐振腔，该谐振腔与目标化学物质的吸收特征频率相匹配.共振是通过采用束缚态的概念在连续（BIC），由一个简单的结构的硅板穿孔的交叉槽阵列与交替槽宽度支持。以HCN（氰化氢）有毒气体的检测为例进行了说明，结果表明，在1个大气压下，用厚度小于100 μm的板可以检测到空气中浓度低至2ppm的HCN。通过引入非目标溴化氢（HBr）气体也证实了这种组装结构的选择性，在原始共振处没有透射下降。结果表明，该结构在气体识别和浓度监测方面具有很大的实际应用潜力。
We proposeand numerically investigatea novel gas sensing structure with large sensitivity and the capability of substance selectivity, as well as high compactness based on the terahertz spectroscopic technique, by using a novel high-quality resonance, which is designed to match the absorption characteristic frequency of the target chemical. The resonance is achieved by employing theconceptof bound state in the continuum (BIC), supported by a simple structure of silicon slab perforated by an interdigitated slot array with alternating slot width. An example of the detection of a toxic gas of HCN (hydrogen cyanide) was demonstrated and it is shown that a HCN concentration as low as 2 ppm in air under the atmospheric pressure of 1 atm can be detected with a slab thickness less than 100 μm. The selectivity of this assembled structure is also confirmed by introducing non-target Hydrogen bromide (HBr) gas, with no transmission drop at the original resonance. It refers to the conclusion that this structure shows great potential for practical applications for both gas identification and concentration monitoring.