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  1. Mohd Syuhaimi Ab Rahman, Noor Azie Azura Mohd Arif, Sahbudin Shaari
    Hablur fotonik menjadi tarikan dalam bidang sains dan teknologi berikutan cirinya yang unik. Kajian ini bertujuan untuk menentukan struktur jalur hablur fotonik akibat perubahan saiz nanorod silikon. Kajian dijalankan dengan menggunakan perisian Bandsolve RSoft. Perisian ini menggunakan pendekatan Plane Wave Expansion Method (PWEM) bagi mengira struktur jalur fotonik. Saiz nanorod silikon yang digunakan adalah dari 0.5 μm hingga 0.05 μm. Hasil yang didapati menunjukkan hanya pada saiz 0.1 μm sehingga 0.4 μm sahaja yang mempamerkan kawasan jalur terlarang.
  2. Wan Nasarudin Wan Jalal, Huda Abdullah, Mohd Syafiq Zulfakar, Sahbudin Shaari, Mohammad Thariqul Islam, Badariah Bais
    Sains Malaysiana, 2014;43:833-842.
    CaxZn(1_x)Al204thin films (x = 0.00; 0 .05 ; 0.10; 0.15 and 0.20) were prepared by sol-gel method with the substitution of Zn2+ by Ca" in the framework of ZnAl204. The effect of Ca addition on the structure and morphology of CaZnAl204thin films was investigated by x-ray diffraction (xRD), field-emission scanning electron microscope (FESEM), energy-dispersive x-ray spectroscopy (EDx), ultra-violet visible (uv-Vis) and atomic force microscope (AFM). The xRD patterns showed the characteristic peaks of face-centred cubic (fcc)ZnAl204and CaZnAl204. The addition of Ca increased the crystallite size from 8.9 to 302 nm. The bandgap of CaxZnuld204 thin film was found in the range of 3.40 to 3.84 eV. sEm micrograph shows the morphology of all thin films is sphere-like, with the grain size increased from 33 to 123 nm. The AFM images show the roughness of surface morphology increased. The substitution of Zn2+ by Ca" increased the crystallite size, grain size and surface roughness which evidently increased the density (4.59 to 4.64 glcm3) and dielectric constant (8.48 to 9.54). The composition of CaxZn(1_x)Al204is considered as suitable material for GPS patch antennas.
  3. Mulyanti B, Menon PS, Sahbudin Shaari, Hazura Haroon, Abang Annuar Ehsan, Hariyadi T, et al.
    Sains Malaysiana, 2014;43:247-252.
    The design of microring resonators (MRRs) for serial configuration, integrated in the lateral scheme was presented and simulated using 3D electromagnetic simulator based on finite integration technique. The device model is embedded on the high index contrast (HIC) structure of silicon-on-insulator with monomodal cavity for TE-mode polarizations. From the proposed model, we varied the MRRs order, waveguides separation distance and ring radius, in order to evaluate the influence of those parameters on the device performance in terms of loss, free spectral range (FSR) and quality factor (Q-factor). Upon varying the gap distances, it was found that the highest Q-factor value of the proposed design was 1275 obtained at gap separation of 150 nm for ring radius of 6 μm, while the largest FSR was 24 nm. The trade-offs between device compactness, optical bandwidth and Q-factor are also presented.
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