Titanium dioxide (TiO2) coated optical fiber-based SPR sensor in near-infrared region with bimetallic structure for enhanced sensitivity

Singh, Yadvendra; Raghuwanshi, Sanjeev Kumar

doi:10.1016/j.ijleo.2020.165842

Cited by 43 publications

(25 citation statements)

References 38 publications

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“…The aim, in order to emphasize this aspect, is to reduce the thickness of the intermediate layer and in the same time to increase its refractive index. To do this, a possible alternative is represented by Metal-Oxide (MO) layers, that have already demonstrated to be an appropriate solution to achieve what wished when are deposited as overlayer [30][31][32][33]. In particular, metal oxides are relevant because they are suitable in different application fields, ranging from optics to photonics and microelectronics [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

“…The aim, to emphasize this aspect, is to reduce the thickness of the intermediate layer and, at the same time, to increase its refractive index. To do this, a possible alternative is represented by metal-oxide (MO) layers, which have already been demonstrated to be an appropriate solution to achieve desired results when deposited as an overlayer. − In particular, metal oxides are relevant because they are suitable in different application fields, ranging from optics to photonics and microelectronics. − MO are indeed transparent in the visible range, chemically inert, with good mechanical properties and with a high refractive index. Among the different processes to integrate MO, processes based on the use of MO precursors in solution (sol–gel chemistry) have been very successful in recent years because they are low-cost techniques, simple to implement, and offer multiple possibilities in terms of chemical compositions and associated properties.…”

Section: Introductionmentioning

confidence: 99%

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Flexible and Ultrathin Metal-Oxide Films for Multiresonance-Based Sensors in Plastic Optical Fibers

Cennamo

Arcadio

Noel

et al. 2021

ACS Appl. Nano Mater.

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We have exploited a laser-based integration process of ultra-thin Metal-Oxide (MO) films in order to improve the plasmonic effect in sensors based on D-shaped Plastic Optical Fibers (POFs). More specifically, by using ultra-thin MO films, the performances of the Surface Plasmon Resonance (SPR) phenomenon improve and a Lossy Mode Resonance (LMR) can occur. Although the role of this kind of materials has been already presented, when they are deposited as overlayer (upside the thin metal film), we have used a different approach by depositing MOs, specially Zirconium Oxide (ZrO 2 ) and Titanium Oxide (TiO 2 ), as flexible intermediate layers between the exposed core of POFs and the gold film. The MO layer is prepared from sol-gel solution and Deep-UV laser curing allows to densify the thin film and tune the refractive index, with a room temperature process fully compatible with the flexible polymer substrates. In a preliminary step, we have carried out numerical results, based on transfer matrix formalism, in order to predict the SPR response. Subsequently, we have experimentally characterized the developed sensor configurations. Numerical and experimental results have shown above all an enhancement of the sensor performances, in terms of SPR sensitivity, with respect to a reference sensor based on a polymer instead of MOs. Moreover, in some proposed sensor configurations, together with the SPR phenomenon, an LMR phenomenon was observed. It occured in a different wavelength range, for a typical refractive index range present when considering receptors for biochemical sensing applications. Therefore, both resonances (SPR and LMR) could be used in several application fields.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flexible and Ultrathin Metal-Oxide Films for Multiresonance-Based Sensors in Plastic Optical Fibers

Cennamo

Arcadio

Noel

et al. 2021

ACS Appl. Nano Mater.

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“…The values for the constants given in equation 1 have been summarized in Table 2. For Au (metal), R.I. can be expressed by Drude Lorentz's model [42]:…”

Section: Refractive Index Of Prism and Other Filmsmentioning

confidence: 99%

Bi-Metallic films of Gold, MXene, and Graphene nano film-based Surface Plasmon Resonance Sensor for Malaria Detection: A Numerical Analysis

Uniyal

Chauhan

Pal

2022

Preprint

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In this proposed work, an SPR-based biosensor with dual nanofilms of a gold metal, 2-Dimensional MXene, and graphene has been proposed to detect different malaria stages. The principal obeyed by the sensor design is attenuated total reflection (ATR) with a modified Kretschmann-based configuration. Numerical computational results give the higher sensitivity for our proposed design as 227.9 degree/RIU (for single MXene and dual graphene layers at RI variation of 1.33 to 1.38 with a change of 0.01) and 258.28 degree/RIU(for trophozoite stage of malaria disease), with other performance parameters like DA computed as equal to 0.14 degree-1 , QF as 31 RIU-1 and 35.5 RIU-1, FWHM as 7.35 degree and 7.27 degree for single MXene, dual graphene nanofilms and trophozoite stage respectively. The suggested biosensor can diagnose the various stages of severe malaria disease by measuring the refractive index alteration in red blood cells (RBCs).

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“…For the resonance phenomenon to occur, there must be an equilibrium between EWV and SPWV [14]. Different works based on SPR biosensing using prism [15], fiber optic [16], and grating coupled [17] have been presented in the past few decades. The sensitivity offered by prism-coupled SPR sensors is better and gives high stability.…”

Section: Introductionmentioning

confidence: 99%

Monitoring hemoglobin levels in human blood samples using an MXene-ZnO-graphene based Surface plasmon resonance biosensor

Manavalan

Kuppusamy

Uniyal

et al. 2022

Preprint

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The main aim of our present study is to propose a surface plasmon resonance-based biosensor design for hemoglobin concentration monitoring in human blood samples. The proposed SPR sensor is based upon the Kretschmann configuration with silver metal, MXene, ZnO, and graphene nanolayers, with a BK7 coupling prism. A He-Ne laser optical input source with a 633 nm wavelength is used following the attenuated total reflection (ATR) principle. After employing the MXene, ZnO, and graphene layers over the conventional sensor setup, an investigation is done. With the optimized structure, our main aim is to detect the presence of hemoglobin concentration in the human blood with its refractive index variation. The calculated highest sensitivity of the proposed configuration is 154 \(Degree/RIU\) with the other parameters calculated as FWHM near \(3.69 Degree\), SNR of 0.5051 \({\text{D}\text{e}\text{g}\text{r}\text{e}\text{e}}^{-1}\) and quality factor of 41.58 \({RIU}^{-1}\).

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Titanium dioxide (TiO2) coated optical fiber-based SPR sensor in near-infrared region with bimetallic structure for enhanced sensitivity

Cited by 43 publications

References 38 publications

Flexible and Ultrathin Metal-Oxide Films for Multiresonance-Based Sensors in Plastic Optical Fibers

Flexible and Ultrathin Metal-Oxide Films for Multiresonance-Based Sensors in Plastic Optical Fibers

Bi-Metallic films of Gold, MXene, and Graphene nano film-based Surface Plasmon Resonance Sensor for Malaria Detection: A Numerical Analysis

Monitoring hemoglobin levels in human blood samples using an MXene-ZnO-graphene based Surface plasmon resonance biosensor

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