A Dual-Channel Surface Plasmon Resonance Sensor Based on Dual-Polarized Photonic Crystal Fiber for Ultra-Wide Range and High Sensitivity of Refractive Index Detection

Abstract

A surface plasmon resonance sensor based on a dual-groove photonic crystal fiber (PCF) for refractive index (RI) sensing with ultra-wide measurement range and high sensitivity is designed and theoretically investigated. The upper and right grooves of the PCF as different sensing channels are coated with Au or Au-TiO 2 compound film. The influence of the parameters on the sensing performance of the designed sensor are analyzed. Numerical results show that the maximum wavelength sensitivity (WS) of 6800 nm/RIU with a wavelength resolution of 1.47× 10 −5 RIU and maximum amplitude sensitivity (AS) of 5440 RIU −1 for the x polarization in the ultra-wide measurement range from 1.25 to 1.43 have been achieved. For y polarization, the proposed sensor has a maximum WS of 13200nm/RIU and AS of 3465 RIU −1 in the detection range from 1.39 to 1.43. The corresponding wavelength resolution is obtained about 7.58× 10 −6 RIU. Moreover, the ultra-wide range and high sensitivity of the sensor can be flexibly adjusted by a polarization controller to meet different practical requirements. Therefore, the proposed sensor would be a suitable candidate for medical testing, bio-sensing and environmental monitoring.

Detection of kerosene adulteration in automobile fuel by a low-loss surface plasmon resonance (SPR) chemical sensor

“…The energy received by the optical fiber probe can be attenuated substantially to even render it undetectable in practice. The minimum losses of the sensors and the corresponding resonance wavelengths 36–102 are calculated and shown in Fig. 10.…”

Sensitivity Enhanced Refractive Index Fiber Sensor Based on Long-Range Surface Plasmon Resonance in SiO2-Au-TiO2 Heterostructure

“…Gold is a commonly-used plasma material in many SPR devices due to its high resonance shift capability and chemical stability. The TiO 2 film is deposited on the gold layer to increase the electromagnetic field extension from the metal film to the analyte, enhancing the interaction of the evanescent wave with the analyte [28]. It is noteworthy that most of the planar-layer silica connects with the air holes directly, where the electromagnetic field tends to be partially reflected to the metal film because of the considerable RI difference at the silica-air interface.…”

Designing Highly Sensitive Surface Plasmon Resonance Sensor With Dual Analyte Channels

“…where, ∆λ peak is the shift of the peak in nm due to the variation of the RIU ∆n a . The corresponding sensor resolution is evaluated as follows [37],…”