Norshamsuri Ali @ Hasim
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Preferred name
Norshamsuri Ali @ Hasim
Official Name
Norshamsuri, Ali
Translated Name
Ali
Alternative Name
Ali, N.
Hashim, N. B.A.
Main Affiliation
Scopus Author ID
58768841500
Researcher ID
L-8205-2016

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  • Publication
    Effect of nanoshell geometries, sizes, and quantum emitter parameters on the sensitivity of plasmon-exciton hybrid nanoshells for sensing application
    (Nature Research, 2023)
    Arezoo Firoozi
    ;
    Angela Amphawan
    ;
    Reza Khordad
    ;
    Ahmad Mohammadi
    ;
    Tahmineh Jalali
    ;
    Collins Okon Edet
    ;
    Norshamsuri Ali @ Hasim
    A proposed nanosensor based on hybrid nanoshells consisting of a core of metal nanoparticles and a coating of molecules is simulated by plasmon-exciton coupling in semi classical approach. We study the interaction of electromagnetic radiation with multilevel atoms in a way that takes into account both the spatial and the temporal dependence of the local fields. Our approach has a wide range of applications, from the description of pulse propagation in two-level media to the elaborate simulation of optoelectronic devices, including sensors. We have numerically solved the corresponding system of coupled Maxwell-Liouville equations using finite difference time domain (FDTD) method for different geometries. Plasmon-exciton hybrid nanoshells with different geometries are designed and simulated, which shows more sensitive to environment refractive index (RI) than nanosensor based on localized surface plasmon. The effects of nanoshell geometries, sizes, and quantum emitter parameters on the sensitivity of nanosensors to changes in the RI of the environment were investigated. It was found that the cone-like nanoshell with a silver core and quantum emitter shell had the highest sensitivity. The tapered shape of the cone like nanoshell leads to a higher density of plasmonic excitations at the tapered end of the nanoshell. Under specific conditions, two sharp, deep LSPR peaks were evident in the scattering data. These distinguishing features are valuable as signatures in nanosensors requiring fast, noninvasive response.
  • Publication
    Waveguide for vortex mode generation in HVAC cloud management communication
    ( 2020-01-08)
    Norshamsuri Ali @ Hasim
    ;
    Amphawan A.
    ;
    Hafizalshah M.H.
    ;
    Syed Alwee Aljunid Syed Junid
    ;
    Rosdisham Endut
    ;
    Mohd Rashidi Che Beson
    ;
    Mohd Najib Mohd Yasin
    ;
    Shapiai M.I.
    Optical modes allow for the transmission of data by propagating light in a singular coherent form along the channel. By constructing a special waveguide structure, a unique mode may be formed in a plane perpendicular to the transmission axis. This paper elucidates on the design of a waveguide to generate unique vortex modes and analyses the properties of the generated modes.
      29  1
  • Publication
    Rapid-convergence minimum mean square error equalization in few mode fiber
    (AIP Publishing Ltd., 2023)
    Angela Amphawan
    ;
    Mustafa Mohammed Najm
    ;
    Norshamsuri Ali @ Hasim
    ;
    Tse-Kian Neo
    ;
    Nor Azura Malini Ahmad Hambali
    ;
    Rosdisham Endut
    ;
    Syed Alwee Aljunid Syed Junid
    Mode coupling is the main bandwidth limitation in mode division multiplexing (MDM) systems. A conventional adaptive algorithm for equalization in MDM is the least mean square (LMS), which has a slow convergence rate. In this work, an adaptive minimum mean square error (MMSE) algorithm is modified for improving the convergence rate for equalization in MDM. The MMSE is based on zero-forcing equalizer (ZFE), redistributing the power coupling coefficients of the received transverse field so that the power is coupled back into the same mode as that at the transmitter. This alleviates inter-symbol interference (ISI). The MMSE-based feedforward equalization (FFE) and decision feedback equalization (DFE) MDM is numerically simulated for 1, 2, 3 and 4 channels. Each channel transmits 10 Gbps for a distance of 1300 meters, carried by a distinct linearly polarized mode, through a few mode fiber (FMF), at a wavelength of 1530 nm. The enhanced MMSE equalization scheme showed improvements in the bit error rate (BER), power coupling matrix, eye diagram and convergence rate. © 2023 American Institute of Physics Inc.. All rights reserved.
      1  12