Browsing by Author "Shaari S."
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Publication Effect of annealing temperature on the structural and optical properties of Zn1-xMnxO(2010) ;Rashid A.R.A. ;Menon P.S. ;Shaari S. ;Universiti Kebangsaan Malaysia (UKM)Universiti Sains Islam Malaysia (USIM)Mn doped ZnO films with different annealing temperatures were synthesized by sol gel method using a spin coating technique. The annealing temperature was varied from 500�C, 550�C, and 700�C. The atomic force microscopy images show the surface morphologies change greatly with an increase in annealing temperature and it also depends on the type of substrate used. The XRD analysis show the films exhibiting hexagonal wurtzite structure with increasing crystalline size at higher temperatures. The optical properties were characterized using UV-Vis where the transmittance decreases due to ionization at higher temperatures which affect the material band gap. � 2010 American Institute of Physics. - Some of the metrics are blocked by yourconsent settings
Publication Evanescent field study on a U-shaped silica fiber absorption sensor using non-sequential ray tracing(Trans Tech Publications Ltd, 2017) ;Rashid A.R.A. ;Mokhtar W.M. ;Dasuki K.A. ;Ehsan A.A. ;Shaari S. ;Faculty of Science and Technology ;Universiti Sains Islam Malaysia (USIM)Universiti Kebangsaan Malaysia (UKM)The ray tracing of unclad U-shape multimode fiber optic is examined by using Zemax simulation have been proposed. The influence of the geometry of sensing region such as absorbing medium refractive index, n2, shape of fiber and the bending radius is analyzed. Number of analysis ray is determined and the value of n2 is varied at 1, 1.3314, 1.359, 1.36, 1.37 and 1.4. The intensity of light propagate inside the fiber is reducing at high n2 and this graph pattern is supported by experimental result. A U-shaped sensor is used for the analysis because of the sensitivity is higher than straight fiber design due to their higher penetration depth. Zemax simulation shows that the fiber with bending radius 1.5 mm has higher response compared to fiber with radius 2.5 mm. � 2017 Trans Tech Publications, Switzerland. - Some of the metrics are blocked by yourconsent settings
Publication Fabrication of gold strip thin film on glass substrate for plasmonic demodulation application(Institute of Electrical and Electronics Engineers Inc., 2015) ;Mukhtar W.M. ;Shaari S. ;Menon P.S. ;Razak H.A. ;Faculty of Science and Technology ;Universiti Sains Islam Malaysia (USIM) ;Universiti Kebangsaan Malaysia (UKM)Universiti Teknikal Malaysia Melaka (UTeM)Plasmonic demodulation is a process where an optical signal due to the generation of surface plasmon polaritons (SPP) reacts with electrical domain, resulted an inverse relationship between them. In this study, fabrication processes of gold strip thin films on the glass substrates are presented. For an optimization purpose of electro-optics effect observation, the width of gold strip thin film is set as 0.5mm, which is equal to the laser beam spot diameter. First, the strip pattern is printed on a commercial transparent plastic slide. The pattern transfer process from plastic slide to glass slide is performed using UV light. Once the pattern is formed on the glass substrate, gold thin film with varies thicknesses namely 30nm, 50nm and 100nm are deposited by monitoring the sputtering time; via d.c. sputtering on the glass substrate which is partly coated with the positive photoresist. The photoresist is removed by immersing the coated glass slide in acetone solution for 15 minutes, follow with DI water for three seconds in an ultrasonic bath. This yields to the establishment of gold strip thin films with dimension of width 0.5mm � length 10mm. An optimal plasmonic demodulation process is successfully acquired by using gold metal strip with thickness of 30nm and higher laser power level, namely P=1.5mW. In a conclusion, we believe that the output of this study will contribute a significant impact to the development of the plasmonic demodulator as an active device. � 2015 IEEE. - Some of the metrics are blocked by yourconsent settings
Publication On the performance of Mach-Zehnder-Interferometer (MZI) optical modulator on silicon-on-insulator (SOI)(Institute of Electrical and Electronics Engineers Inc., 2015) ;Razak H.A. ;Haroon H. ;Zain A.S.M. ;Menon P.S. ;Shaari S. ;Mukhtar W.M. ;Faculty of Science and Technology ;Universiti Teknikal Malaysia Melaka (UTeM) ;Universiti Kebangsaan Malaysia (UKM)Universiti Sains Islam Malaysia (USIM)In recent years, there has been a significant interest in the development of optical waveguide modulators using Silicon-On-Insulator (SOI) substrates motivated by the potential to provide a reliable low-cost alternative to other photonic materials. Objective: In this paper, Multimode Interference (MMI) device is used to develop the MZI structure of the optical modulator. Meanwhile, the electrical part of the modulator utilizes the forward biased P-I-N structure. The effect of varying MMI width to the performance of the MZI optical modulator on SOI was investigated. The effect of varying MMI width to the insertion loss (IL), extinction ratio (ER) and modulation efficiency (V?L) of the device were carried out. Results: The investigated MMI widths are 22, 30 and 38 ?m. Smallest MMI width, which is 22 ?m has recorded the lowest value of insertion loss with 3.30 dB and the best extinction ratio of 25.60 dB. However, the best modulation efficiency was observed for the MMI width of 38 ?m with 0.1696 V.cm. Conclusion: Appropriate selection of MMI width is vital to ensure optimum performance of the MZI modulator. � 2015 IEEE.