High sensitivity surface plasmon resonance sensor based on D-shaped photonic crystal fiber using Ag/α-Fe2O3
محورهای موضوعی : فصلنامه نانوساختارهای اپتوالکترونیکی
Seyed Hossein Moayed
1
,
Mojtaba Sadeghi
2
,
Zahra Adelpour
3
1 - Department of Electrical Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran
2 - Department of Electrical Engineering, Shi.C., Islamic Azad University, Shiraz, Iran
3 - Department of Electrical Engineering, Shi.C., Islamic Azad University, Shiraz, Iran
کلید واژه: Photonic crystal fiber, Plasmonic, Nano sensor, Surface plasmon polariton,
چکیده مقاله :
In the present study, an ultrahigh-sensitivity photonic crystal fiber (PCF) sensor which works based on the surface plasmon resonance (SPR) phenomenon is proposed. The structure is cut into a D-shape and two layers of Ag and hematite ( ) materials are placed on the cut part. The layer prevents silver oxidation as well as significantly increases the interaction between light and the analyte, thereby increasing the efficiency of the sensor. In this structure, evanescent waves interact with the free electrons of the metal, and surface plasmon waves arise, based on which sensing is performed. The method of finite element (FEM) modeling is employed to investigate the response of the SPR sensor to the refractive index (RI). By examining the loss peak shift, the desired refractive indices can be identified. The presented PCF sensor provides a very high sensitivity of 9200 nm/RIU and also covers a detectable refractive index range of 1.3 to 1.4. The performance of the PCF-SPR sensor implies that it can be very suitable for use in applications such as biosensing and chemical detection.
In the present study, an ultrahigh-sensitivity photonic crystal fiber (PCF) sensor which works based on the surface plasmon resonance (SPR) phenomenon is proposed. The structure is cut into a D-shape and two layers of Ag and hematite ( ) materials are placed on the cut part. The layer prevents silver oxidation as well as significantly increases the interaction between light and the analyte, thereby increasing the efficiency of the sensor. In this structure, evanescent waves interact with the free electrons of the metal, and surface plasmon waves arise, based on which sensing is performed. The method of finite element (FEM) modeling is employed to investigate the response of the SPR sensor to the refractive index (RI). By examining the loss peak shift, the desired refractive indices can be identified. The presented PCF sensor provides a very high sensitivity of 9200 nm/RIU and also covers a detectable refractive index range of 1.3 to 1.4. The performance of the PCF-SPR sensor implies that it can be very suitable for use in applications such as biosensing and chemical detection.
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