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  1. AU="Gupta, Jegyasu"
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  1. Article ; Online: Electro-tunable metasurface for tri-state dynamic polarization switching at near-infrared wavelengths.

    Bhowmik, Tanmay / Gupta, Jegyasu / Sikdar, Debabrata

    Journal of physics. Condensed matter : an Institute of Physics journal

    2023  Volume 35, Issue 39

    Abstract: Control of polarization states of light is crucial for any photonic system. However, conventional polarization-controlling elements are typically static and bulky. Metasurfaces open a new paradigm to realize flat optical components by engineering meta- ... ...

    Abstract Control of polarization states of light is crucial for any photonic system. However, conventional polarization-controlling elements are typically static and bulky. Metasurfaces open a new paradigm to realize flat optical components by engineering meta-atoms at sub-wavelength scale. Tunable metasurfaces can provide enormous degrees-of-freedom to tailor electromagnetic properties of light and thus have the potential to realize dynamic polarization control in nanoscale. In this study, we propose a novel electro-tunable metasurface to enable dynamic control of polarization states of reflected light. The proposed metasurface comprises a two-dimensional array of elliptical Ag-nanopillars deposited on indium-tin-oxide (ITO)-Al
    Language English
    Publishing date 2023-07-04
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472968-4
    ISSN 1361-648X ; 0953-8984
    ISSN (online) 1361-648X
    ISSN 0953-8984
    DOI 10.1088/1361-648X/ace01b
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Aperture-patch sandwich metasurface for magnetic field enhancement in 1.5 T MRI.

    Das, Priyanka / Gupta, Jegyasu / Sikdar, Debabrata / Bhattacharjee, Ratnajit

    Magnetic resonance imaging

    2023  Volume 100, Page(s) 1–9

    Abstract: Magnetic resonance imaging (MRI) is an increasingly popular non-invasive technique for clinical diagnosis. Signal-to-noise ratio (SNR) is a crucial performance metric of MRI, improvement of which can be exchanged for increased image resolution or ... ...

    Abstract Magnetic resonance imaging (MRI) is an increasingly popular non-invasive technique for clinical diagnosis. Signal-to-noise ratio (SNR) is a crucial performance metric of MRI, improvement of which can be exchanged for increased image resolution or decreased scan time. Besides the progress in various hardware and software techniques for improving SNR in MRI scanners, use of metasurfaces as accessories has recently shown potential towards enhancing SNR by boosting local magnetic field in the scanned volume. Magnetic field enhancement over a larger depth from the skin is essential for imaging of deeper tissues, which can be facilitated by a specifically designed metasurface. Here we present such a metasurface with complementary-type resonant structures on the two sides of a high-permittivity dielectric, which substantially increases magnetic flux density on the skin (forty-five fold) that decays down to unity at a depth of 95 mm from the skin. This results in boosting of SNR up to forty-fold on the skin in 1.5 T MRI, while keeping tissue heating below the safety limit. An original analytical approach is formulated to readily estimate the SNR enhancement factor of this metasurface. Using the designed metasurface as an accessory for MRI scanners could help making MRI scans more efficient and affordable.
    MeSH term(s) Magnetic Resonance Imaging/methods ; Magnetic Fields ; Signal-To-Noise Ratio ; Phantoms, Imaging
    Language English
    Publishing date 2023-03-15
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 604885-7
    ISSN 1873-5894 ; 0730-725X
    ISSN (online) 1873-5894
    ISSN 0730-725X
    DOI 10.1016/j.mri.2023.03.005
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Energy-saving all-weather window based on selective filtering of solar spectral radiation.

    Chowdhary, Ashish Kumar / Bhowmik, Tanmay / Gupta, Jegyasu / Sikdar, Debabrata

    Applied optics

    2021  Volume 60, Issue 5, Page(s) 1315–1325

    Abstract: Passive all-weather windows, capable of selectively transmitting visible and infrared solar radiation, could help in bringing down fossil-fuel energy consumption globally by reducing the carbon footprint of typical air-conditioning systems for buildings ... ...

    Abstract Passive all-weather windows, capable of selectively transmitting visible and infrared solar radiation, could help in bringing down fossil-fuel energy consumption globally by reducing the carbon footprint of typical air-conditioning systems for buildings and motor vehicles. Here, we report on designing metal-insulator-metal thin-films for application in passive windows, optimized for different climatic conditions. We analyze designs comprising different noble metals as well as their relatively inexpensive alternatives. By finding an optimal choice of materials and thicknesses of the metal and dielectric layers, our lithography-free simple design can provide all-weather solutions for passive windows with desired visible and infrared transmission/blocking capability. Obtained theoretical results agree well with full-wave simulations. Thus, our proposed designs enable developing low-cost, ultra-thin (thickness: 47-85 nm), polarization-independent, angle-insensitive (up to 83 deg), and large-area-compatible passive windows with improved solar-radiation control for different weather/climatic conditions. The figure-of-merit calculation shows that the relatively inexpensive metals used in our passive glasses can outperform industry-standard commercial glasses and previously reported infrared-blocking plasmonic glasses.
    Language English
    Publishing date 2021-03-09
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4522
    ISSN (online) 1539-4522
    DOI 10.1364/AO.412932
    Database MEDical Literature Analysis and Retrieval System OnLINE

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