Nor Roshidah Yusof
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Nor Roshidah Yusof
Official Name
Nor Roshidah, Yusof
Alternative Name
Roshidah, N.
Yusof, Nor Roshidah
Yusof, N. R.
Yusof, Roshidah
Main Affiliation
Scopus Author ID
56023921300
Researcher ID
ITT-8107-2023

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  • Publication
    Geometrical optimization of lithium niobate on insulator rib waveguide for quantum communication application
    (AIP Publishing, 2020)
    Nor Roshidah Yusof
    ;
    Norshamsuri Ali @ Hasim
    ;
    P. Kolenderski
    ;
    Nor Azura Malini Ahmad Hambali
    ;
    Syed Alwee Aljunid Syed Junid
    Recently, thin film Lithium niobate has been recognized as an alternative material to silicon based technology due to its capability to support a broader range for quantum communication system. With the aim to operate within single photon application, we demonstrate the mode distribution, propagation constant and effective refractive indices of the Lithium Niobate on Insulator rib waveguide which operates at both fundamental wavelength, 1550 nm and second harmonic wavelength, 775 nm, respectively by using Finite Element Method. The etched depth and width of the core was varied from 340 to 400 nm and 700 to 1400 nm, respectively with the thickness of slab is fixed at 100 nm. From the result, it shows the effective refractive index increases gradually with the increment of etched depth and width of core, respectively. At second harmonic wavelength, the effective refractive indices and propagation constant shows a significant increment compare to observation at 1550 nm with an ability to produce both fundamental mode and first order mode across the structure.
  • Publication
    Generation Orbital Angular Momentum Modes Using Metasurfaces
    ( 2023-10-06)
    NHuda S.
    ;
    Norshamsuri Ali @ Hasim
    ;
    Amphawan A.
    ;
    Nor Roshidah Yusof
    ;
    Rosdisham Endut
    ;
    Nor Azura Malini Ahmad Hambali
    ;
    Mohd Najib Mohd Yasin
    ;
    Syed Alwee Aljunid Syed Junid
    The purpose of this study is to investigate how numerous orbital angular momentum (OAM) modes may be produced by mixing acoustic plane beams with different metasurfaces. This study proposes a novel metasurface that may be simulated in order to generate OAM beams. Multi-beam and multi-mode terahertz wave incidence are produced utilizing vortex modes in the beams. The study of suitable OAM superpositions of waveguide eigenmodes is done using COMSOL Multiphysic, followed by a description of the software's usage and examples of challenges involved. With the existence of these studies, we can also prove that the mode can be produced completely with the results that have been studied. Based on the results obtained, an objective was achieved, which is to design the feature of the vortex beam modes. These results include the construction of a multi-functional vortex beam based on a theoretical model of phase gradient distribution. Also, by using metasurface mimics to specify a periodic structure specified by the user from the built-in unit cell, and the beam was attenuated and split into two paths inside the thin layer. Finally, the simulation process between 2D and 3D is very significant because the mesh and geometry in a design are very different, but generating a beam using COMSOL already has a specific module, namely the wave optic module, which can be used to predict the beam modes.
      1  37
  • Publication
    Digital fringe projection for hand surface coordinate variation analysis caused by osteoarthritis
    ( 2017)
    Wan Mokhdzani Wan Nor Haimi
    ;
    Cheek Hau Tan
    ;
    Vithyacharan Retnasamy
    ;
    Rajendaran Vairavan
    ;
    Muhammad Hafiz Ab Aziz
    ;
    Zaliman Sauli
    ;
    Nor Roshidah Yusof
    ;
    Nor Azura Malini Ahmad Hambali
    ;
    Ahmad Syahir Ahmad Bakhit
    Hand osteoarthritis is one of the most common forms of arthritis which impact millions of people worldwide. The disabling problem occurs when the protective cartilage on the boundaries of bones wear off over time. Currently, in order to identify hand osteoarthritis, special instruments namely X-ray scanning and MRI are used for the detection but it also has its limitations such as radiation exposure and can be quite costly. In this work, an optical metrology system based on digital fringe projection which comprises of an LCD projector, CCD camera and a personal computer has been developed to anticipate abnormal growth or deformation on the joints of the hand which are common symptoms of osteoarthritis. The main concept of this optical metrology system is to apply structured light as imaging source for surface change detection. The imaging source utilizes fringe patterns generated by C++ programming and is shifted by 3 phase shifts based on the 3 steps 2 shifts method. Phase wrapping technique and analysis were applied in order to detect the deformation of live subjects. The result has demonstrated a successful method of hand deformation detection based on the pixel tracking differences of a normal and deformed state.
      5  26