CAJ | 학술논문

根据倾斜光纤光栅（TFBG）和表面镀金的 TFBG传感器测量折射率的基本原理，通过OptiGrating软件模拟了不同浓度溶液下T FBG的透射谱和芯层模与某阶包层模耦合引起的谐振峰，初步得出了 T FBG各阶包层模随着外界折射率的增大而向右偏移、在一定的传感范围内中心波长与外界折射率呈线性关系的结论。用小型离子溅射仪对T FBG镀45 nm厚度左右的金膜，并用扫描电镜在微观上观察镀膜效果。通过不同浓度下的NaCl溶液、M gCl2溶液、CaCl2溶液实验，对比研究了裸 T FBG和镀金 T FBG传感器对溶液折射率的传感特性。从而验证了模拟仿真得出的结论并定量分析得知：镀金后具有表面等离子体共振的T FBG溶液折射率灵敏度大于500 nm · RIU -1，而裸T FBG为2 nm · RIU -1左右，大约提高了200～300倍，且在一定范围内中心波长与溶液折射率的线性拟合度都在0.99以上。
근거경사광섬광책（TFBG）화표면도금적 TFBG전감기측량절사솔적기본원리，통과OptiGrating연건모의료불동농도용액하T FBG적투사보화심층모여모계포층모우합인기적해진봉，초보득출료 T FBG각계포층모수착외계절사솔적증대이향우편이、재일정적전감범위내중심파장여외계절사솔정선성관계적결론。용소형리자천사의대T FBG도45 nm후도좌우적금막，병용소묘전경재미관상관찰도막효과。통과불동농도하적NaCl용액、M gCl2용액、CaCl2용액실험，대비연구료라 T FBG화도금 T FBG전감기대용액절사솔적전감특성。종이험증료모의방진득출적결론병정량분석득지：도금후구유표면등리자체공진적T FBG용액절사솔령민도대우500 nm · RIU -1，이라T FBG위2 nm · RIU -1좌우，대약제고료200～300배，차재일정범위내중심파장여용액절사솔적선성의합도도재0.99이상。
The present paper analyzes the sensor’s basic principle of the bare tilted fiber Bragg grating (TFBG) and surface plas-mon resonance sensor (SPR) that deposited nanoscale gold-coating on the surface of the cladding .We simulated the transmission spectrums and some order cladding mode of TFBG in different concentration solutions by Integration and optical fiber grating software OptiGrating .So by the graphic observation and data analysis ,a preliminary conclusion was got that in a certain sensing scope ,the cladding modes of TFBG shift slightly to right with the increasing the solution refractive index (SRI) ,and the relation between resonance peak caused by the coupling of core mode and a certain cladding mode and the SRI was linear .Then the 45 nm thick gold coating was deposited on the surface of the TFBG cladding in a small-scale sputtering chamber KYKY SBC-12 ,and thermal field scanning electron microscopy presents that the effect of gold-coating was satisfactory to a certain extent in terms of microscopic level .The refractive index (RI) sensing experiments of different concentration solutions of NaCl ,MgCl2 ,CaCl2 were carried out using bare and gold deposited TFBG .The RI sensing characteristics of both bare and gold deposited TFBGs re-spectively were studied by experiments .Meanwhile ,it proved the conclusion that the cladding modes of TFBG drifted to right gradually when the SRI was increasing and the relations between resonance peak caused by the coupling of core mode and a cer-tain cladding mode and the SRI were linear . And by quantitative analysis , we know that SPR sensor with the deposited namoscale gold layer on the surface of cladding enhanced the RI sensitivity dramatically by 2 to 500 nm · RIU -1 which is 200 to 300 times larger than that of the bare tilted fiber Bragg grating approximately .The degrees of linear fittings of resonance peak caused by the coupling of core mode and a certain cladding mode and SRI of bare and gold-coating deposited SPR sensor are very good and both of them reach up to more than 0.99 .