强激光与粒子束2026，Vol.38Issue(4)：12-21,10.DOI:10.11884/HPLPB202638.250301
基于SPR的可同时检测超宽范围折射率和温度的锚型双通道高阶模式PCF传感器设计
Dual-channel high-order mode PCF sensor based on surface plasmon resonance for refractive index and temperature detection
摘要
Abstract
[Background]Simultaneous and accurate detection of multiple physical and biochemical parameters,such as refractive index(RI)and temperature,is critically important in complex sensing environments,including biological analysis and cancer cell detection.Photonic crystal fiber sensors based on surface plasmon resonance(PCF-SPR)have attracted considerable attention due to their high sensitivity and compact structure.However,achieving ultra-wide RI detection ranges,effective temperature compensation,and low cross-sensitivity within a single fiber platform remains a significant challenge,particularly when higher-order mode excitation and polarization selectivity are required.[Purpose]The purpose of this study is to propose and numerically investigate a dual-channel PCF-SPR sensor capable of simultaneous RI and temperature sensing over an ultra-wide range,while achieving polarization-resolved mode excitation and reduced cross-interference between sensing channels.[Methods]An anchor-shaped asymmetric photonic crystal fiber with orthogonally polished semi-circular surfaces is designed.Gold(Au)and polydimethylsiloxane(PDMS)thin films are selectively deposited on different polished surfaces to construct two independent SPR sensing channels.Polarization-resolved excitation of high-order modes is achieved through structural asymmetry and selective coating.A full-vector finite-element method based on COMSOL Multiphysics is employed to analyze mode distributions,loss spectra,and resonance wavelength shifts.Key structural parameters,including air-hole geometry and metal-dielectric layer thicknesses,are systematically optimized to enhance plasmonic coupling strength and mode confinement.[Results]Simulation results indicate that the x-polarized channel coated with Au and PDMS exhibits dual sensitivity to RI and temperature,whereas the y-polarized channel coated only with Au responds exclusively to RI variations of another analyte.The proposed sensor achieves an ultra-wide RI detection range from 1.21 to 1.44,with a maximum RI sensitivity of 14 500 nm/RIU.The temperature sensing range spans from-100℃to 100℃,and a peak temperature sensitivity of 4 nm/℃is obtained.Clear polarization-dependent resonance characteristics and effective channel decoupling are demonstrated.[Conclusions]The proposed dual-channel anchor-shaped PCF-SPR sensor combines ultra-wide RI detection,temperature sensing capability,and polarization-resolved selectivity within a compact fiber structure.Its high sensitivity,flexible channel configuration,and strong resistance to cross-interference make it a promising platform for real-time multi-parameter sensing in complex biological and chemical applications,such as cancer cell detection and biochemical analysis.关键词
光子晶体光纤/表面等离子体共振/折射率传感器/温度传感器/光纤传感Key words
photonic crystal fibers/surface plasmon resonance/refractive index sensors/temperature sensors/fiber optic sensing分类
信息技术与安全科学引用本文复制引用
李新宇,毛一民,张兆,徐晴,卢翔,任芳..基于SPR的可同时检测超宽范围折射率和温度的锚型双通道高阶模式PCF传感器设计[J].强激光与粒子束,2026,38(4):12-21,10.基金项目
中央高校基本科研业务费专项资金项目(FRF-TP-19-016A2) （FRF-TP-19-016A2）
