Research on Tunable SPR Sensors Based on WS2 and Graphene Hybrid Nanosheets

This paper presents a novel approach for pathogenic bacteria detection (PathoBactD) through the utilization of a surface plasmon resonance (SPR)-based biosensor. The sensor consists of a BK7 prism coated with silver (Ag), barium titanate (BaTiO3), and molybdenum diselenide (MoSe2) in the Kretschmann arrangement. The proposed SPR-based biological sensor incorporates the concept of attenuated total reflection (ATR) for accurate measurements. Various performance characteristics of the sensor, including sensitivity, figure of merit (FoM), signal-to-noise ratio (SNR), detection accuracy, and quality factor, have been thoroughly analyzed. The integration of BaTiO3 significantly enhances the sensor's capability for PathoBactD. To evaluate the impact of the BaTiO3 layer on the performance parameters of the MoSe2-based SPR biological sensor, a theoretical model employing the angular interrogation technique has been developed.

Optical Interactions With Tissue and Cells XXXV

Section: Calculation To Estimate the Performance Of An Optical Prism-...mentioning

confidence: 99%

Novel surface plasmon resonance (SPR)-based biosensor for pathogenic bacteria detection (PathoBactD)

Kumar,

Raghuwanshi,

Kumar

2024

“…The greater the detection accuracy, the narrower the SPR spectral shape. We describe detection accuracy in this analysis as the ratio between the shift in resonance angle and the full width halfmaximum (FWHM) of reflectance curve, giving it a unit-less measure 16 .…”

Section: Methane Sensingmentioning

confidence: 99%

“…The quality factor (Q) is described as the ratio of reflectance sensitivity to FWHM 16 . The quality factor is evaluated in RIU -1 .…”

Section: Methane Sensingmentioning

confidence: 99%

Realization of prism-based surface plasmon resonance sensor for detection of methane gas

Raghuwanshi

Oxide-Based Materials and Devices XIV

2023

Prism-based surface plasmon resonance (SPR) optical sensors are extensively used in a variety of applications. In implementing a multilayer sensing structure, SPR phenomena are employed to detect gases in the proposed research. A BK7 glass prism is used as a sensing structure with decomposition on nano thin films based on different materials: silver (Ag), titanium dioxide (TiO2), and graphene. The methane gas is applied to the graphene sensing layer of the multilayer optical sensor. As the methane gas concentration rises around the sensor, the SPR angle varies, indicating that the refractive index of graphene layer is changed significantly due to absorption of the increasing methane gas concentration. The methane gas concentration measurement is based on an angle interrogation technique. TiO2, graphene, and Ag layers of different thicknesses have been optimised for sensor performance.

“…The greater the detection accuracy, the narrower the SPR spectral shape. We describe detection accuracy in this analysis as the ratio of the resonance angle change related to the full width at half maximum (FWHM) of the reflectance curve, giving it a unit-less measure 12 .…”

Section: S=δθ/δnmentioning

confidence: 99%

“…The quality factor (Q) is described as the ratio of reflectance sensitivity to FWHM 12 . The quality factor is Evaluated in RIU -1 Q = S / (FWHM)…”

Section: Da = δθ /Fwhmmentioning

confidence: 99%

Design and analysis of prism-based surface plasmon resonance optical sensor for detection of ammonia gas

Raghuwanshi

Plasmonics in Biology and Medicine XX

2023

Surface plasmon resonance (SPR) sensors are extensively used in a variety of applications. In the proposed investigation, SPR phenomena are used to detect toxic gases by employing a multilayer sensing chip. A glass prism is coated with a nano composite thin film based on different materials: gold (Au), titanium dioxide (TiO2), and molybdenum disulfide (MoS2). The ammonia gas is applied to the MoS2 sensing layer of the multilayer optical sensing chip. As the ammonia gas concentration rises around the multilayer sensing structure, the resonance angle increases, indicating that the MoS2 layer refractive index has gone up significantly due to absorption of the increasing ammonia gas concentration. The measured ammonia gas concentration is based on an angle interrogation approach. The sensor performance has also been optimized for varied MoS2 and Au layer thicknesses. This article has all the mathematical equations that are needed, and MATLAB software is used to check the results.