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Author: search.filters.author.Arora, PankajSubject: search.filters.subject.Graphene

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    Design and comparative analysis of aluminum-BiFeO3-based plasmonic device in the near-infrared region
    (Springer, 2024-05) Arora, Pankaj
    In this work, a nano-plasmonic device based on Aluminum with BiFeO3 (BFO), as a multiferroic oxide with remarkable dielectric properties, is engineered using the transfer matrix method for implementation in an optical communication band for sensing applications. A comparative study is performed between different dielectric materials (e.g., BFO, Silicon, and Indium Phosphide), and the highest Figure of Merit (FOM) is achieved for the surface plasmon resonance sensor with BFO as the intermediate layer. To further increase the binding efficiency of the biomolecules with the sensing surface, a monolayer of 2D nanomaterial, namely Molybdenum disulfide, Graphene, MXene, and Fluorinated Graphene (FG), is added to the surface of the plasmonic device. After a rigorous analysis, FG is found to have the highest FOM of 334°/RIU and sensitivity of 125°/RIU. In summary, our work reveals potential applications for the proposed nano-plasmonic device based on Al-BFO configuration as a new type of supporting material with a monolayer of FG for enhancing biosensing activity.
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    Analysis of engineered aluminum-based plasmonic devices decorated with graphene/2D nanomaterials for enhanced biosensing applications in the near-infrared region
    (IEEE, 2021) Arora, Pankaj
    The dynamics of light-matter interaction between metal-analyte interfaces can be studied by the surface plasmon resonance phenomenon. Among the plasmonic metals, Aluminum (Al) has become quite a popular choice because of its ability to access a wider spectral range as well as better compatibility with optoelectronic devices. However, the study of Al as a plasmonic material has been almost completely confined to its periodic nanostructures/nanoclusters [1] , and there are limited reports of Al being used as a plasmonic metal in the standard Kretschmann configuration in the near-infrared region. Therefore, the proposed work reports the modified Kretschmann configuration with Al as a plasmonic metal for Surface Plasmon (SP) excitation to capture the minute changes in the refractive index of the analyte. The present work has also employed the advantages of Graphene (Gr) in context to increased interactions with biomolecules since Gr has emerged as an attractive alternative to be used as a biomolecular recognition element to functionalize the metal layer. Along with it, silicon is used as a high-index dielectric which enhances the sensitivity to produce accurate detection results. An optimized number of stacks of Silicon-Gr sheets are utilized for bio-sensing applications after negotiating the trade-off between important parameters like sensitivity and Figure of Merit (FOM) as shown in Fig. 1(a) . To demonstrate a bio-sensing application in the communication band, varying concentrations of the Leptospira bacterium in the form of different refractive indices are analyzed among the infected rodents and the sensitivity (S) and FOM were found to be 200°/RIU and 95.23 RIU -1 respectively at the wavelength of 1550 nm which are much better than the previously reported results in the literature.
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    Design and comparative analysis of aluminum-MoS2 based plasmonic devices with enhanced sensitivity and Figure of Merit for biosensing applications in the near-infrared region
    (Elsevier, 2021-02) Arora, Pankaj
    Aluminum (Al)-Molybdenum Disulfide (MoS2) based plasmonic structures act as excellent biosensors when exploited in the near-infrared region. While Al is economical as well as compatible with the optoelectronic devices, MoS2 is an emerging 2D nanomaterial with the promise of initiating better plasmonic activity. Based on Kretschmann's arrangement, we have explored angular interrogation over four different combinations of heterostructures with Al as the plasmonic metal layer, at a wavelength of 1550 nm. After studying the effect of Al thickness on the conventional configuration, the intermediate layers between the metal layer and the analyte were optimized. Inclusion of graphene along with MoS2 results in better interaction with the sensing medium. The effect of including silicon is also studied for sensitivity enhancement. In addition, a comparative analysis of sensor performances of the proposed devices is presented taking into account the two important parameters i.e. sensitivity as well as the Figure of Merit (FOM). Among the optimized multi-layered MoS2 based configurations, a maximum sensitivity of about 141°/RIU is obtained along with FOM of about 335.13 RIU−1. Finally, the single-stranded DNA sensing on the proposed devices shows that the structures can be used as a highly sensitive refractive index biosensor for bio-medical applications.