Wu Leiming, Che Kai, Xiang Yuanjiang, Qin Yuwen
Institute of Advanced Photonics Technology, School of Information Engineering, Guangdong University of Technology, Guangzhou 510006, China.
Guangdong Provincial Key Laboratory of Information Photonics Technology, Guangdong University of Technology, Guangzhou 510006, China.
Nanomaterials (Basel). 2022 Jan 4;12(1):168. doi: 10.3390/nano12010168.
A guided-wave long-range surface plasmon resonance (GW-LRSPR) sensor was proposed in this investigation. In the proposed sensor, high-refractive-index (RI) dielectric films (i.e., CHNHPbBr perovskite, silicon) served as the guided-wave (GW) layer, which was combined with the long-range surface plasmon resonance (LRSPR) structure to form the GW-LRSPR sensing structure. The theoretical results based on the transfer matrix method (TMM) demonstrated that the LRSPR signal was enhanced by the additional high#x2212;RI GW layer, which was called the GW-LRSPR signal. The achieved GW-LRSPR signal had a strong ability to perceive the analyte. By optimizing the low- and high-RI dielectrics in the GW-LRSPR sensing structure, we obtained the highest sensitivity (S) of 1340.4 RIU based on a CHNHPbBr GW layer, and the corresponding figure of merit (FOM) was 8.16 × 10 RIU deg. Compared with the conventional LRSPR sensor (S = 688.9 RIU), the sensitivity of this new type of sensor was improved by nearly 94%.
本研究提出了一种导波长程表面等离子体共振（GW-LRSPR）传感器。在所提出的传感器中，高折射率（RI）介电薄膜（即CHNHPbBr钙钛矿、硅）用作导波（GW）层，其与长程表面等离子体共振（LRSPR）结构相结合，形成GW-LRSPR传感结构。基于传输矩阵法（TMM）的理论结果表明，额外的高折射率GW层增强了LRSPR信号，该信号被称为GW-LRSPR信号。所实现的GW-LRSPR信号具有很强的感知分析物的能力。通过优化GW-LRSPR传感结构中的低折射率和高折射率电介质，基于CHNHPbBr GW层，我们获得了1340.4 RIU的最高灵敏度（S），相应的品质因数（FOM）为8.16×10 RIU/°。与传统的LRSPR传感器（S = 688.9 RIU）相比，这种新型传感器的灵敏度提高了近94%。
