Photonic Crystal Fiber Pollution Sensor Based on the Surface Plasmon Resonance Technology

تم اقتراح الألياف البلورية الضوئية (PCF) بناءً على تأثير رنين البلازمون السطحي (SPR) للكشف عن عينات المياه الملوثة. يتم توضيف خصائص الاستشعار باستخدام طريقة العناصر المحدودة. الفجوة على الجانب الأيمن من قلب PCF مطلية بمادة الذهب المستقرة كيميائيًا لتحقيق عملية الاستشعار. تم فحص معلمات أداء المستشعر المقترح من حيث حساسية الطول الموجي ، وحساسية السعة ، ودقة المستشعر ، والعلاقة الخطية لطول  موجة الرنين مع تغيرفي  معامل الانكسار العينات . في نطاق الاستشعار من 1.33 إلى 1.3624 ، تم تحقيق اقصى حساسية بلغت  1360.2 nm ∕ RIU  و  1184 RIU−مع دقة مستشعر عالية بلغت 7 ×10-5 RIU  و5.4× 10−5  باستخدام طرق التحقيق  كالطول الموجي والسعة على التوالي. يمكن تصنيع المستشعر المقترح لإكتشاف الملوثات في المياه  عن طريق ايجاد معاملات انكسارها  .Photonic Crystal Fiber (PCF) based on the Surface Plasmon Resonance (SPR) effect has been proposed to detect polluted water samples. The sensing characteristics are illustrated using the finite element method. The right hole of the right side of PCF core has been coated with chemically stable gold material to achieve the practical sensing approach. The performance parameter of the proposed sensor is investigated in terms of wavelength sensitivity, amplitude sensitivity, sensor resolution, and linearity of the resonant wavelength with the variation of refractive index of analyte. In the sensing range of 1.33 to 1.3624, maximum sensitivities of 1360.2 nm ∕ RIU and 184 RIU−1 are achieved with the high sensor resolutions of 7 ×10-5 RIU and 5.4× 10−5 RIU using wavelength and amplitude interrogation methods, respectively. The proposed sensor could be established to detect various refractive index (RI) of pollutions in water

Comparison between one layer and bilayer surface plasmon resonance optical fiber chemical sensor

Surface Plasmon Resonance (SPR) - based plastic optical fiber has been provided as a sensor to estimate the refractive index and then the concentration of specific chemical samples. Two configurations were suggested for the design. The first was through using a single layer of gold with a thickness of about 40nm deposited on a 10mm portion in the middle of plastic optical fiber. In the second configuration, a bilayer is deposited on the fiber. This bilayer consisted of a gold layer with a thickness of about 30 nm and an aluminum layer with a thickness of about 30 nm. Both of these configurations are utilized as chemical sensors. The resonance wavelength for the bilayer-based sensor was higher than that of the single-layer sensor for all studied chemical samples. The highest resonance wavelength was for the salt-water solution with a concentration of 30%. For the salt-water solution with a concentration of 30%, the resonance wavelength with the bilayer-based sensor was 568nm while it was 540nm with the single-layer sensor