Surface plasmon resonance biosensor based on double-U-groove photonic crystal fiber with very high sensitivity and refractive index detection

Subject Areas : Electronic Engineering

seyed hossein moayed ¹ , Mojtaba Sadeghi ^{2 *} , Zahra Adelpour ³

1 -
2 - Department of Electrical Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran
3 - Department of Electrical Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran

Received: 2025-03-02 Accepted : 2025-06-11 Published : 2025-10-13

Keywords: biosensor, photonic crystal fiber, surface plasmon resonance, finite element method.,

Abstract :

In this In this paper, a highly sensitive surface plasmon resonance biosensor based on a double-groove photonic crystal fiber has been introduced. The proposed structure consists of an air-hole ring and a gold-TiN-hole ring. To increase the sensitivity and efficiency of the sensor, two U-shaped grooves are created at the top and bottom of the structure and a thin layer of gold is deposited on them. The combination of these materials and the designed geometry has ensured that the phase-matching condition is properly established and the refractive index of the analyte material is detected. The finite element method has been used for numerical simulation, mode analysis, and investigation of the surface plasmon resonance characteristics of the photonic crystal fiber biosensor. Numerical results show that the sensor has a high sensitivity of 8100  and a resolution of  RIU. Also, the detectable refractive index range of the sensor is 1.35 to 1.39 and its maximum FOM is 112  . Based on the obtained results, the proposed sensor is an excellent option for medical and biomolecular diagnostic applications.

References:

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