Abstract
The temperature effect is one of the critical factors to induce the resonance wavelength shift in fiber-optic surface plasmon resonance (SPR) sensors, which leads to the inaccuracy measurement of refractive index (RI) in practical applications. In this study, a novel dual-wavelength method is presented for fiber-optic SPR sensors to measure the changes of RI and temperature simultaneously in real time. A typical model of an SPR-based fiber optical sensor is constructed for theoretical analysis of temperature effect. Both the thermo-optic effect in the fiber core and phonon–electron scattering along with electron–electron scattering in the metal layer are studied systematically in the theoretical model. The linear and independent relationship, about the dependence of defined output signals on the RI and temperature, is validated by a theoretical calculation in specific dual wavelengths. A proof-of-concept experiment is conducted to demonstrate the capability of the presented dual-wavelength technique. The experimental results indicate that the presented dual-wavelength method is technically feasible and can be applied for practical application. Since the presented method only depends on the full advantages of the transfer spectrum data, it can be applied directly to the conventional single-channel fiber-optic SPR without any specific design structure of the sensor probe. The proposed method provides a new way to detect the RI under different thermal conditions and could lead to a better design for the fiber-optic SPR sensors.
Highlights
IntroductionThe fiber-optic Surface plasmon resonance (SPR) sensor is a novel bio-chemical sensor that can be applied broadly in the fields of biomolecular interaction analysis, chemical/biological analytes detection and medical diagnostics [5,6,7,8]
We present and demonstrate a novel dual-wavelength method for simultaneous measurement of the refractive index (RI) and temperature variation in this paper
Based on the theoretical analysis and the resonance characteristics of the fiber-optic Surface plasmon resonance (SPR) sensor, we present a linear model between the change of reflectance transmission signal and the change of RI/temperature of the analyte with two specific incident wavelengths
Summary
The fiber-optic SPR sensor is a novel bio-chemical sensor that can be applied broadly in the fields of biomolecular interaction analysis, chemical/biological analytes detection and medical diagnostics [5,6,7,8]. It is capable of detecting tiny RI changes of an analyte or other physical quantities that equivalently convert to RI changes [9,10]. All of the physical parameters result in the wavelength shift of fiber-optic SPR sensor. The application of fiber-optic SPR sensors is limited by the accurate detection of wavelength shift. In all the interference parameters, the temperature of the measuring object is one of the critical factors for the fiber-optic
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