Browsing by Author "Murat N.F."
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Publication Influence of electromagnetic (EM) waves polarization modes on surface plasmon resonance(EDP Sciences, 2017) ;Murat N.F. ;Mukhtar W.M. ;Menon P.S. ;Abdul Rashid A.R. ;Ahmad Dasuki K. ;Awangku Yussuf A.A.R. ;Faculty of Science and Technology ;Universiti Sains Islam Malaysia (USIM)Universiti Kebangsaan Malaysia (UKM)Optical sensor based on surface plasmon resonance are widely used for various applications. In this paper, an optimization of EM waves polarization modes for the occurrence of SPR by using a modified optical waveguiding assembly has been discussed. A 633 nm of linearly polarized He-Ne laser was appointed as a light source. The polarization modes were controlled by rotating the position of He-Ne laser. It was found that the optimum SPR signal with reflectance, R = 0.21 a.u and SPR angle, ?SPR = 48� can be obtained as the position of laser was rotated at 90�, with the presence of polarizer. The location of the critical angle was observed at ?C = 46�. For the validation purpose, a simulation based on Fresnel equation was conducted where the percentage difference between the experimental and theoretical results were analyzed. The percentage difference between experimental and theoretical results for both ?SPR and ?C were 9.09% and 15.00% respectively. In conclusion, an excellent agreement between the theoretical and experimental findings proved the stability of this SPR setup, where the EM waves polarization can easily be controlled by manipulating the position of laser. � The Authors, published by EDP Sciences, 2017. - Some of the metrics are blocked by yourconsent settings
Publication Kretschmann based surface plasmon resonance for sensing in visible region(Institute of Electrical and Electronics Engineers Inc., 2019) ;Menon P.S. ;Gan S.M. ;Mohamad N.R. ;Jamil N.A. ;Tarumaraja K.A. ;Razak N.R. ;Bakar A.A.A. ;Mukhtar W.M. ;Murat N.F. ;Mohamed R. ;Khairulazdan N.B. ;Said F.A. ;Faculty of Science and Technology ;Universiti Kebangsaan Malaysia (UKM)Universiti Sains Islam Malaysia (USIM)Kretschmann-based surface plasmon resonance (K-SPR) sensing approach using planar thin metal films offer distinct advantages over other label-free sensing techniques in the visible region. SPR phenomenon occurs due to the propagation of electromagnetic waves along the surface of the thin metal layers. Practically, some refractive index changes on the dielectric sample layer will cause changes in surface plasmon polaritons (SPP). The main purpose of using this coupling technique is to match the light-wave vector wave with the SPP vector wave. This paper will give an overview of the design and development of SPR-based sensors utilizing the angular interrogation Kretschmann configuration for detecting the presence of various analytes such as urea, creatinine, glucose, ethanol and uric acid in the visible region. Various sensor layers such as 50-nm thick gold (Au), MoS2/graphene, Au/graphene oxide, Ag/ITO and Au/Ag/ZnO thin films were used to detect the analytes at 633 nm, 670 nm and 785 nm visible electromagnetic wavelengths. Output characteristics such as the reflectivity, full width at half maximum (FWHM), sensitivity, Q factor and Figure of merit (FOM) of the sensors were analyzed. Results of this study was obtained using Lumerical's Finite Difference Time Domain (FDTD) and experimental characterization was obtained using Bionavis SPR equipment; available at IMEN, UKM. � 2019 IEEE. - Some of the metrics are blocked by yourconsent settings
Publication Maximizing the response of SPR signal: A vital role of light excitation wavelength(American Institute of Physics Inc., 2018) ;Mukhtar W.M. ;Murat N.F. ;Samsuri N.D. ;Dasuki K.A. ;Faculty of Science and TechnologyUniversiti Sains Islam Malaysia (USIM)Criteria for development of high sensitivity surface plasmon resonance (SPR) sensor depends on several factors such as types of metals, light polarization modes, light coupling techniques and thicknesses of metal film. This paper discussed the effect of light excitation wavelength ranging from ultra violet (UV) region to infrared (IR) region on SPR. Three regions have been classified such as UV region (from ?=200nm to ?380nm), visible region (from ?=400nm to ?=633nm) and IR region (from ?=870nm to ?=1550nm). Noble metal gold thin film with thickness of 50nm and refractive index of n=0.1759+3.3104k was deposited on top of BK7 triangular prism (n=1.51). Very weak SPR signal was generated as the excitation wavelength was set in UV region. The signal's strength increased about 26.63% with the increment of wavelength from ?=200nm until ?=380nm, resulting the blue-shifting of SPR angle from 54.03�to 43.48�. The greatest excitation of SPP was significantly observed as the visible light region was incident through the thin film gold-coated prism represented by the abrupt decreased of Rmin to 96.50% at ?=633nm. The SPR angle was red-shifted about 0.30�throughout this region. The SPR signal getting weaker as light excitation wavelength entered the IR region (from ?=870nm to ?=1550nm) indicated by the 64.34% inclination of Rmin. In this region, the SPR angle was remain red-shifted from ?SPR=44.97�until ?SPR=46.18�with the average increment of 0.31�for each wavelength. It can be concluded that the usage of red laser, ?=633nm able to enhance the maximum excitation of SPP. The remarkable outcome of this work shows the vital role of light excitation wavelength in generating strong SPR signal for various application such as sensor and optoelectronic device. � 2018 Author(s). - Some of the metrics are blocked by yourconsent settings
Publication Optimization of gold thin films thicknesses in enhancing SPR response(Institute of Electrical and Electronics Engineers Inc., 2016) ;Murat N.F. ;Mukhtar W.M. ;Rashid A.R.A. ;Dasuki K.A. ;Yussuf A.A.R.A. ;Faculty of Science and TechnologyUniversiti Sains Islam Malaysia (USIM)Nowadays, surface plasmon resonance (SPR) sensor has been widely used in biosensing applications to detect the wide diversity of biomolecular interactions. There are few parameters need to be concerned in order to optimize the performance of SPR sensors such as film thicknesses, type of thin films and their configurations. In this study, we seek to determine the optimum thicknesses of hybrid thin films which consist of gold-graphene oxide layers for the enhancement of SPR sensor sensitivity. By using a theoretical approach, a WINSPALL 3.02 simulator had been used to investigate the effects of various thicknesses of hybrid configuration's thin films towards the excitation of surface plasmon polaritons (SPP). A layer of 3 nm protein was added to compare the maximum adsorption of the SPR sensor based on their configuration. It was found that the optimum thicknesses of gold and graphene oxide are 50 nm and 0.68 nm respectively for achieving best sensitivity. Thus, the sensitivity value for gold-GO thin films is higher than silver-GO which are 19.42 �/RIU and 5.45 �/RIU with FWHM = 2.28� and 0.64� respectively. � 2016 IEEE. - Some of the metrics are blocked by yourconsent settings
Publication Study on plasmon absorption of hybrid Au-GO-GNP films for SPR sensing application(American Institute of Physics Inc., 2018) ;Mukhtar W.M. ;Ahmad F.H. ;Samsuri N.D. ;Murat N.F. ;Faculty of Science and TechnologyUniversiti Sains Islam Malaysia (USIM)This study proposed the development of hybrid Au-GO-GNP films for the enhancement of plasmon absorption in SPR sensing. Several thicknesses of Au at t=40nm, t=50nm and t=300nm were sputtered on the glass substrate. The hybridization of bilayer and trilayer films were formed by depositing GO-GNP layers and GNP-GO layers on top of various thicknesses of Au coated substrates. UV-Vis spectra analysis was conducted to characterize the plasmon absorption for each configuration. The plasmon absorption was successfully amplified by employing hybrid trilayer Au-GO-GNP with the thickness of Au film was fixed at t=50nm. It is noteworthy to highlight that the employment of bilayer and trilayer configurations are the key success to enhance the SPP excitation. Au-GNP and Au-GNP-GO results no significant outcome in comparison with Au-GO and Au-GO-GNP. A redshift of the absorbance wavelength evinces the presence of GO on Au-GO sample and GNP on Au-GO-GNP sample due to the surface reconstruction. It is important to emphasize that not all bilayer and trilayer configurations able to enhance the plasmon absorption where no significant output was obtained with the hybridization order of Au-GNP and Au-GNP-GO.