Analysis of Novel Class of Surface Plasmon Phenomena Having a Metamaterial Layer Between Two Different Metals for Sensor Application

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.

Section: Equation For Measuring Performancementioning

confidence: 99%

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

Raghuwanshi

Oxide-Based Materials and Devices XIV

2023

“…The final layer of the multilayer structure is connected to the first layer of tangential fields. Fresnel's equation determines light transmission and reflection in multilayer structures 11 . The value of a reflection could be determined using elementary mathematical procedures to obtain a portion of the coefficient for p-polarized light in Eq.…”

Section: Formula For Calculating Performance Of Single and Multi-laye...mentioning

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.

A Theoretical analysis of Milk adulteration/contamination detection in camel, buffalo and cow milk using SPR Technique

Singh¹,

Srivastava²,

Dwivedi³

2023

J. Phys.: Conf. Ser.

In this paper author have targeted to detect various kinds of adulteration/contamination in camel, cow and buffalo milk using surface plasmon resonance (SPR) technique. SPR technique have numerous features like its label free technique, provide real time analysis and able to detect very minute change in sample’s physical condition from its ideal condition. The change in sample physical condition change can estimate using change in refractive index. The adulteration in milk does for financial benefits but they are highly dangerous for health especially for children and pregnant women. Some more contamination added knowingly as a preservative but they affect the purity of milk so that their detection is essential. In this paper author have targeted to detect mainly urea, melamine, Salmonella and coconut oil in milk by using a Kretschmann configuration based SPR sensor. The sensor consists of high refractive index prism (ZnSe) as a dielectric substrate, gold (Au) nanolayer, Graphene monolayer and heterostructure of BlueP/MoS2. Major performance parameters like sensitivity, Figure of Merit (FoM), Detection accuracy and limit of detection also calculated for each case to validate the result of proposed sensor. The performance of sensor is done in visible region in theoretical way using analytical software MATLAB.