LiNbO_3棱镜耦合双金属薄膜表面等离子共振传感器
|
摘要
高折射率铌酸锂(LiNbO_3)(2.202)为棱镜耦合激发的角度调制型表面等离子共振传感器,利用反射率公式优化单层银膜、金膜和双层银/金膜传感器薄膜的厚度,分别计算了优化厚度的传感器在检测样品折射率为1.330时的共振角、灵敏度、峰值半宽度(FWHM)和品质因数(FOM),理论计算表明:双层金属薄膜,随着金膜厚度的增加,传感器灵敏度增加,但峰值半宽度增加,品质因数下降。综合考虑,选择银/金(41/5)优化组合,传感器品质因数为优化的单层金膜(47 nm)传感器品质因数的2倍以上,另外,与常用的BK7玻璃棱镜耦合相比,LiNbO_3棱镜耦合具有较大的样品动态检测范围。优化厚度的传感器实验检测糖水浓度表明:糖水浓度与共振角为线性比例关系。
A bimetallic layered surface plasmon resonance( SPR) based high refractive index LiNbO_3 prism coupling by angular interrogation is proposed. The thicknesses of single layer silver film,single layer gold film and bimetallic film sensor thin-film are optimized by reflectivity formula. The sensitivity,full-width-half-maximum( FWHM),resonance angle and figure of merit( FOM) of SPR sensor with optimum thickness while refractive index of tested sample is 1. 330 are calculated. Theoretical calculation show that with the increasing of the thickness of gold layer in bimetallic film,both the sensitivity and FWHM of the SPR sensor increase,nevertheless FOM decrease. By comparison,the thicknesses of silver and gold in bimetallic film sensor are selected 41 nm and 5 nm,respectively. In addition,compared the commonly BK7 glass prism,the optimized SPR sensor has larger sample dynamic detection range. The experimental result shows that the concentration of sweet water is linearly relationship with resonance angle.
A bimetallic layered surface plasmon resonance( SPR) based high refractive index LiNbO_3 prism coupling by angular interrogation is proposed. The thicknesses of single layer silver film,single layer gold film and bimetallic film sensor thin-film are optimized by reflectivity formula. The sensitivity,full-width-half-maximum( FWHM),resonance angle and figure of merit( FOM) of SPR sensor with optimum thickness while refractive index of tested sample is 1. 330 are calculated. Theoretical calculation show that with the increasing of the thickness of gold layer in bimetallic film,both the sensitivity and FWHM of the SPR sensor increase,nevertheless FOM decrease. By comparison,the thicknesses of silver and gold in bimetallic film sensor are selected 41 nm and 5 nm,respectively. In addition,compared the commonly BK7 glass prism,the optimized SPR sensor has larger sample dynamic detection range. The experimental result shows that the concentration of sweet water is linearly relationship with resonance angle.
引文
[1]Jorgenson R C,Yee S S.A fiber-optic chemical sensor based on surface plasmon resonance[J].Sensors and Actuators B:Chemical,1993,12(3):213-220.
[2]Zimple Matharu,Sumana G,Pandey M K,et al.Low density lipoprotein sensor based on surface plasmon resonance[J].Thin Solid Films,2009,518(2):719-723.
[3]Tsai W C,Li L C.SPR-based immunosensor for determining staphylococcal enterotoxin A[J].Sensors and Actuators B:Chemical,2009,136(1):8-12.
[4]Sarika Singh,Banshi D Gupta.Fabrication and characterization of a highly sensitive surface plasmon resonance based fiber optic p H sensor utilizing high index layer and smart hydrogel[J].Sensors and Actuators B:Chemical,2012,173:268-273.
[5]符运良,张铁民,王林茂.表面等离子共振生物传感器检测磺胺类药物残留[J].传感器与微系统,2012,31(12):133-135.
[6]Pesticides Yes.Eren Saylana,Semra Akg9nüllüa,et al.Development of surface plasmon resonance sensors based on molecularly imprinted nanofilms for sensitive and selective detection of pesticides[J].Sensors and Actuators B:Chemical,2017,241(31):446-454.
[7]Yakes B J,Buijs J,Elliott C T,et al.Surface plasmon resonance biosensing:Approaches for screening and charactering antibodies for food diagnostics[J].Talanta,2016,156-157(15):55-63.
[8]Rana Tabassum,Banshi D Gupta.SPR-based fiber-optic sensor with enhanced electric field intersity and figure of merit using different single and bimetallic configurations[J].Optics Communications,2016,367(15):23-24.
[9]Huang Y,Xia L P,Wei W,et al.Theoretical investigation of voltage sensitivity enhancement for surface plasmon resonance based optical fiber sensor with a bimetallic layer[J].Optics Communications,2014,333(15):146-150.
[10]Du W,Zhao F.Silicon carbide based surface plasmon resonance waveguide sensor with a bimetallic layer for improved sensitivity[J].Materials Letters,2017,186(1):224-226.
[11]Luo L,Feng G Y,Zhou S H,et al.Theoretical study of a refractive-index sensor based on directional coupling between metalinsulator-metal waveguides[J].Optik,2016,127(4):2149-2152.
[12]David Michel,Feng X,Kamal Alameh.A compact,flexible fiberoptic surface plasmon resonance sensor sensor with changeable sensor chips[J].Sensors and Actuators B:Chemical,2017,246:258-261.
[13]Kooyman R P,Kolkman J,Van Gent,et al.Surface plasmon resonance immunosensors:Sensitivity considerations[J].Analytica Chimica Acta,1998,213:35-45.
[14]Triranjita Srivastava,Ritwick Das,Rajan Jha.Highly accurate and sensitive surface plasmon resonance sensor based on channel photonic crystal waveguides[J].Sensors and Actuators B:Chemical,2011,157(1):246-252.
[15]Pradeep Kumar Teotia,Kaler R S.Multilayer with periodic grating based high performance SPR waveguide sensor[J].Optics Communications,2017,395(15):154-158.
[16]Chen S J,Lin C Y.High-performance bimetallic film surface plasmon resonancesensor based on film thickness optimization[J].Optik,2016,127(4):7514-7519.
[17]白泽生,刘竹琴,徐红.几种液体的折射率与其浓度关系的经验公式[J].延安大学学报:自然科学版,2004,23(1):35-36.
[2]Zimple Matharu,Sumana G,Pandey M K,et al.Low density lipoprotein sensor based on surface plasmon resonance[J].Thin Solid Films,2009,518(2):719-723.
[3]Tsai W C,Li L C.SPR-based immunosensor for determining staphylococcal enterotoxin A[J].Sensors and Actuators B:Chemical,2009,136(1):8-12.
[4]Sarika Singh,Banshi D Gupta.Fabrication and characterization of a highly sensitive surface plasmon resonance based fiber optic p H sensor utilizing high index layer and smart hydrogel[J].Sensors and Actuators B:Chemical,2012,173:268-273.
[5]符运良,张铁民,王林茂.表面等离子共振生物传感器检测磺胺类药物残留[J].传感器与微系统,2012,31(12):133-135.
[6]Pesticides Yes.Eren Saylana,Semra Akg9nüllüa,et al.Development of surface plasmon resonance sensors based on molecularly imprinted nanofilms for sensitive and selective detection of pesticides[J].Sensors and Actuators B:Chemical,2017,241(31):446-454.
[7]Yakes B J,Buijs J,Elliott C T,et al.Surface plasmon resonance biosensing:Approaches for screening and charactering antibodies for food diagnostics[J].Talanta,2016,156-157(15):55-63.
[8]Rana Tabassum,Banshi D Gupta.SPR-based fiber-optic sensor with enhanced electric field intersity and figure of merit using different single and bimetallic configurations[J].Optics Communications,2016,367(15):23-24.
[9]Huang Y,Xia L P,Wei W,et al.Theoretical investigation of voltage sensitivity enhancement for surface plasmon resonance based optical fiber sensor with a bimetallic layer[J].Optics Communications,2014,333(15):146-150.
[10]Du W,Zhao F.Silicon carbide based surface plasmon resonance waveguide sensor with a bimetallic layer for improved sensitivity[J].Materials Letters,2017,186(1):224-226.
[11]Luo L,Feng G Y,Zhou S H,et al.Theoretical study of a refractive-index sensor based on directional coupling between metalinsulator-metal waveguides[J].Optik,2016,127(4):2149-2152.
[12]David Michel,Feng X,Kamal Alameh.A compact,flexible fiberoptic surface plasmon resonance sensor sensor with changeable sensor chips[J].Sensors and Actuators B:Chemical,2017,246:258-261.
[13]Kooyman R P,Kolkman J,Van Gent,et al.Surface plasmon resonance immunosensors:Sensitivity considerations[J].Analytica Chimica Acta,1998,213:35-45.
[14]Triranjita Srivastava,Ritwick Das,Rajan Jha.Highly accurate and sensitive surface plasmon resonance sensor based on channel photonic crystal waveguides[J].Sensors and Actuators B:Chemical,2011,157(1):246-252.
[15]Pradeep Kumar Teotia,Kaler R S.Multilayer with periodic grating based high performance SPR waveguide sensor[J].Optics Communications,2017,395(15):154-158.
[16]Chen S J,Lin C Y.High-performance bimetallic film surface plasmon resonancesensor based on film thickness optimization[J].Optik,2016,127(4):7514-7519.
[17]白泽生,刘竹琴,徐红.几种液体的折射率与其浓度关系的经验公式[J].延安大学学报:自然科学版,2004,23(1):35-36.