Department of Electrical and Electronics Engineering

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

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    Aluminum as a competitive plasmonic material for the entire electromagnetic spectrum: A review
    (Elsevier, 2024-11) Arora, Pankaj
    With plasmonics taking the lead in most sensing applications, research has geared towards alternative, cost-effective materials that can strive for large-scale production along with CMOS compatibility. Aluminum (Al) is among those competitive plasmonic metal films that have seen unprecedented research in recent years. The ability to exhibit appreciable plasmonic response in the entire electromagnetic spectrum has been reported along with improved performance sensing parameters. This review article covers different aspects of Al-based nanostructures, nano-films, and nano-particles in different wavelength regimes, displaying efficient plasmonic sensing for myriad purposes. A comprehensive review is conducted to explore the diverse and exciting possibilities emerging from Al-based tunable plasmons at the metal-dielectric interface. Al has already entered many applications, from on-chip plasmonic integration to point-of-care diagnosis. Thus, the application of Al in wide applications (heath, fluorescence, image-filtering techniques, and many more) is discussed here, along with the corresponding limitations and future scope associated with them.
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    Aluminum-Based Engineered Plasmonic Nanostructures for the Enhanced Refractive Index and Thickness Sensing in Ultraviolet-Visible-Near Infrared Spectral Range
    (Electromagnetics Academy, 2019-03) Arora, Pankaj
    We engineer Aluminum (Al) based periodic plasmonic nanostructures for enhanced refractive index and thickness sensing, which offer to access complete ultraviolet-visible-near infrared spectral range for surface plasmon resonance sensors. Al-based periodic nanostructures on top of a thin homogeneous Al metal coated on a BK-7 glass substrate were designed by systematic variation of geometrical parameters using Rigorous Coupled Wave Analysis and finite elements full wave solver. The shift in surface plasmon mode excited on the nanostructure-analyte interface was used to measure the variation in refractive index, and the number of waveguide modes with the increase in the thickness of the analyte was used to capture the variation in thickness of the analyte. The proposed nanostructures of period 400 nm and an aspect ratio of 0.1 offered a sensitivity of 400 nm/RIU and full width at half maximum of 18 nm resulting in a figure of merit of 22. These Al-based plasmonic nanostructures have potential to be used as refractive index and thickness sensor due to a high figure of merit, high localization of the field, and very low aspect ratio that is needed to maintain laminar flow of analyte.
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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.
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    Investigation of 2D nanomaterials on MXene ( Ti3C2Tx)‑based aluminum plasmonic devices for biosensing in the near‑infrared region
    (Applied Physics, 2022-08) Arora, Pankaj
    In this work, we have engineered Aluminum (Al)-based plasmonic devices with MXene ( Ti3C2Tx) nanosheet to achieve both high sensitivities as well Figure of Merit (FOM) simultaneously for the wavelength of 1550 nm in the optical communication band. Since, studying 2D nanomaterials can provide quality collaboration for Ti3C2Tx, from their functionalization to application; Black Phosphorus, Graphene, fluorinated Graphene, and MoS2 are undertaken for this purpose. The effect of such 2D nanomaterials has been studied on both sensitivity and FOM for Ti3C2Tx- based engineered Al-plasmonic devices and a decent value of both sensitivity (119°/RIU) and FOM ( 340RIU−1) is achieved in the Kretschmann’s configuration. To demonstrate the bio-sensing application with the proposed plasmonic devices, the detection of protein solution concentration, based on the change in their refractive indices, is carried out. The proposed Ti3C2Tx- based Al-plasmonic devices show promising applications in the optical communication band, employing fluorinated graphene and MoS2 in the near-infrared region.