Effect of Spectral Signal-to-Noise Ratio on Resolution Enhancement at Surface Plasmon Resonance

Abstract

Refractive index resolution is an important indicator for a wavelength interrogation surface plasmon resonance sensor, which can be affected by signal-to-noise ratio. This paper investigates the impact of spectral signal-to-noise ratio on a surface plasmon resonance sensor. The effects of different spectral powers and noises are compared and verified through simulation and experiments. The results indicate that the optimal resonance wavelength is changed and the refractive index resolution can even be nearly twice as good when the spectral signal-to-noise ratio is increased. The optimal resonance wavelength can be found by changing the spectral power distribution or noise.

Surface Plasmon Resonance Biosensors Based on Kretschmann Configuration: Basic Instrumentation and Applications

“…Larger the shift, higher is the sensitivity. For a Kretschmann configuration based SPR sensor, the sensitivities for angular modulation and wavelength modulation can be derived from equation (6) and are given by [31,42,72,76],…”

Non-perpendicular incidence angle of cold atmospheric-pressure plasma treatment for fabrication of silver-based surface plasmon resonance biosensor for detection of Escherichia coli in water

“…where S n is the sensitivity, and FWHM can be determined by calculating the full width at half maximum of the reflectance dip (Dl 0:5 ) In this work, the wavelength interrogation method was used. Refractive index (RI) resolution (r sensor ) is an important indicator for a wavelength interrogation SPR sensor, which can be affected by signal-to-noise ratio and can be obtained as follows (Ma et al 2021):…”

“…dl is mainly affected by the FWHM and reflectance dip of the SPR curve. The standard deviation of the resonance wavelength here is used as the detection accuracy (dl) of the wavelength (Ma et al 2021).…”

Coffee Ring Effect Enhanced Surface Plasmon Resonance Imaging Biosensor via 2-λ Fitting Detection Method

“…Typically, there are four interrogation modes of SPRi sensing: intensity, angle, phase, and wavelength. Among them [21], the wavelength interrogation SPRi interrogation mode (WSPRi) can freely select the optimal excitation light wavelength for different samples and has a large dynamic range for covering the refractive index (RI) difference of the various samples to be tested [22][23][24]. Therefore, WSPRi sensing is more suitable for imaging detection.…”