Surface Plasmon Resonance Based Temperature Sensors in Liquid Environment.

Joyce Ibrahim,Serge Cioulachtjian,Mostafa Al Masri,Colette Veillas,Frédéric Celle,Yves Jourlin,Thomas Kampfe,Isabelle Verrier,Frédéric Lefèvre

doi:10.3390/s19153354

Abstract

The aim of this work is to measure the temperature variations by analyzing the plasmon signature on a metallic surface that is periodically structured and immersed in a liquid. A change in the temperature of the sample surface induces a modification of the local refractive index leading to a shift of the surface plasmon resonance (SPR) frequency due to the strong interaction between the evanescent electric field and the metallic surface. The experimental set-up used in this study to detect the refractive index changes is based on a metallic grating permitting a direct excitation of a plasmon wave, leading to a high sensibility, high-temperature range and contactless sensor within a very compact and simple device. The experimental set-up demonstrated that SPR could be used as a non-invasive, high-resolution temperature measurement method for metallic surfaces.

Highlights

The surface temperature at the interface between a solid and a liquid is often difficult to evaluate because the introduction of a probe into the device induces disturbances on the value to be measured [1].Optical methods can overcome this disadvantage but are not usually adapted to the environment studied
The surface plasmon resonance (SPR) measurement often reaches interesting sensitivities in terms of index variations [6]. This technique is well known for applications in the field of sensors in biology [11], chemistry [12] or food industry [13], it has rarely been experimentally studied for the measurement of the temperature of a surface in a liquid environment
The experimental values of the resonance wavelength are a few nanometers higher than the theoretical ones (Figure 10), which may be due to a slight error on the positioning of the incidence angle relative to that initially fixed

Summary

Introduction

The surface temperature at the interface between a solid and a liquid is often difficult to evaluate because the introduction of a probe into the device induces disturbances on the value to be measured [1].Optical methods can overcome this disadvantage but are not usually adapted to the environment studied. The surface plasmon resonance (SPR) measurement often reaches interesting sensitivities in terms of index variations [6]. This technique is well known for applications in the field of sensors in biology [11], chemistry [12] or food industry [13], it has rarely been experimentally studied for the measurement of the temperature of a surface in a liquid environment. Several studies were developed with optical fibers metalized either at their end [14] or along their diameter [15] The sensitivity of these SPR devices can reach interesting values. The integration of these probes into a high-pressure chamber is difficult to realize

Objectives

Methods

Findings

Conclusion