Dual-angle technique for simultaneous measurement of refractive index and temperature based on a surface plasmon resonance sensor

Luo, Wei; Chen, Sheng; Chen, Lei; Li, Hualong; Miao, Pengcheng; Gao, Huiyi; Hu, Zhengyan; Li, Miao

doi:10.1364/oe.25.012733

Cited by 36 publications

(6 citation statements)

References 16 publications

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“…Inspired by the dual-incident angle technique for the prism-based SPR sensor [37][38][39][40], a dual-wavelength method is presented for the fiber-optic SPR sensor in this paper. Based on the theoretical analysis and the resonance characteristics of the fiber-optic 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.…”

Section: The Principle Of Dual-wavelength Methods and Theoretical Calculation Of Fiber-optic Spr Sensormentioning

confidence: 99%

A Novel Dual-Wavelength Method for Evaluating Temperature Effect in Fiber-Optic SPR Sensors

Luo

Wang

et al. 2021

Applied Sciences

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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.

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Section: The Principle Of Dual-wavelength Methods and Theoretical Calculation Of Fiber-optic Spr Sensormentioning

confidence: 99%

A Novel Dual-Wavelength Method for Evaluating Temperature Effect in Fiber-Optic SPR Sensors

Luo

Wang

et al. 2021

Applied Sciences

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“…It is well established that SPR signals can be affected by environmental factors beyond the refractive index, including temperature , and charge, , which can render discrimination of true analyte signal difficult. The utilization of a dual-angle measurement technique has been proposed to simultaneously discriminate changes in refractive index and temperature on an SPR device in the Kretschmann configuration . Under this method, the intensity of reflected light is measured at two different angles, one below the SPR angle and one above, which respond variably to refractive index and temperature.…”

Section: Platforms and Instrumentationmentioning

confidence: 99%

“…The utilization of a dual-angle measurement technique has been proposed to simultaneously discriminate changes in refractive index and temperature on an SPR device in the Kretschmann configuration. 25 Under this method, the intensity of reflected light is measured at two different angles, one below the SPR angle and one above, which respond variably to refractive index and temperature. An inverse sensitivity matrix, which defines the refractive index and temperature sensitivities at each angle, may then be applied to both angular measurements for discriminatory extrapolation of refractive index and temperature changes.…”

Section: ■ Platforms and Instrumentationmentioning

confidence: 99%

Surface Plasmon Resonance: Material and Interface Design for Universal Accessibility

2017

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“…Wei et al analyzed the effect of temperature [14]. Rehmanh [15] and Reale [16] gave the effects of thickness for both theory and experiments. Nash measured the dielectric function of silver through the excitation of surface plasmon-polaritons on a silver-covered silica grating [17].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Dielectric Constants of Thin Noble Metallic Films Using a Surface Plasmon Resonance Sensor

Tao

Deng

Hong-yun

et al. 2020

Sensors

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Gold and silver have an extremely low refractive index value of about 0.04 in the visible to near infrared (NIR) regions, and this induces a relative error of about 50% in refractive index measurements. This can lead to a large uncertainty in the imaginary part of the dielectric constants. A large difference exists between the experimental results and the classic models. The surface plasmon resonance (SPR) sensors, which use tens of nanometer thick noble metal film as the sensing layer, show ultra-high sensitivity (reaching 10−8 RIU) in this spectral range. As the spectral sensitivity and amplitude of SPR curves depend on the thickness and the dielectric constant of the sensing layer, we obtained high precision optical constants of the noble metal film using a multi-wavelength angle-modulated SPR sensing technology. The dielectric constant inferred from the parameters of the SPR curves, rather than from the refractive index and absorption ratio of noble metals, introduced a relative error within 10% of the resonance angle measurement. The measurement results demonstrate that the dielectric constants of gold and silver nano-films are more consistent with the widely used experimental results than with the classical theoretical model and always fall in the upper half of the imaginary part of the uncertainty range in the spectra of 500–900 nm.

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Dual-angle technique for simultaneous measurement of refractive index and temperature based on a surface plasmon resonance sensor

Cited by 36 publications

References 16 publications

A Novel Dual-Wavelength Method for Evaluating Temperature Effect in Fiber-Optic SPR Sensors

A Novel Dual-Wavelength Method for Evaluating Temperature Effect in Fiber-Optic SPR Sensors

Surface Plasmon Resonance: Material and Interface Design for Universal Accessibility

Experimental Investigation of the Dielectric Constants of Thin Noble Metallic Films Using a Surface Plasmon Resonance Sensor

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