Refractive Index Sensing Simulations of CsPbBr_(3) Quantum Dots/Gold Bilayer Coated Triangular-Lattice Photonic Crystal Fibers  

Refractive Index Sensing Simulations of CsPbBr3 Quantum Dots/Gold Bilayer Coated Triangular-Lattice Photonic Crystal

作　　者：Ye TAO Han YE Yong DING Xiaomin REN Xiaolong LIU 

机构地区：[1]School of New Energy,North China Electric Power University,Beijing 102206,China [2]State Key Laboratory of Information Photonics and Optical Communications,University of Posts and Telecommunications,Beijing 100876,China

出　　处：《Photonic Sensors》2022年第3期17-29,共13页光子传感器（英文版）

基　　金：supported by National Key Research and Development Program of China(Grant No.2016YFA0202401);National Natural Science Foundation of China(Grant No.61705066);Open Fund of IPOC(BUPT)(Grant No.IPOC2018B004);Fundamental Research Funds for the Central Universities,China(Grant No.2020JG002).

摘　　要：With the incorporation of noble metal materials,photonic crystal fibers(PCFs)could be performed as an effective platform for refractive index sensing of the filling analytes.Furthermore,by coating functional dielectric layers upon the metal surfaces,the resonance energy transfer is modulated from the core mode of the PCFs towards the surface plasmon resonance mode of the metals,and the sensing performance could be boosted.Here,considering that the exciton-plasmon coupling is efficient between perovskite quantum dots(QDs)and gold,a kind of CsPbBr_(3) QDs/Au bilayer coated triangular-lattice PCFs has been simulated numerically as the refractive index sensors.With the optimization of the QDs and gold layer thicknesses,together with the variation of the central hole size of the PCFs,in the refractive index(RI)region of 1.26 to 1.34,a rather narrow full width at half maximum(FWHM)of the loss spectra was achieved as 13.74 nm when the central hole size was 1.28μm and the highest figure of merit was 63.79 RIU(the central hole size was 1.53μm).This work demonstrates that the analyte identification accuracy was enhanced by FWHM narrowing of the loss spectra;in addition,taking the abundance of the material choice of perovskite QDs into consideration,more analytes could be detected effectively.Moreover,by adopting asymmetric structures,the sensitivity of the PCFs based refractive index sensors could be further improved.

关 键 词：Photonic crystal fibers perovskite quantum dots refractive index sensor narrow FWHM 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TB383.2[一般工业技术—材料科学与工程]