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    Atom bottom-up manipulation controlled by light for nanobattery use
    (2012-04-01)
    Ismail, F. D.
    ;
    Teeka, C.
    ;
    Ali, J.
    ;
    Yupapin, P. P.
    We propose a new design of the atom bottom-up technique that uses an optical trapping tool to form the atom trapping layer within a thin film grating. By using a PANDA ring resonator, where atoms can be trapped, pumped and controlled by light, where finally, the trapped atoms/molecules can be selected, filtered, and embedded within the required thin film grating layers, which later can form the nanobattery. In application, P-type or N-type atom can be prepared, trapped and embedded within the desired thin film layers, where finally, the nanobattery can be manipulated. The theoretical background of light pulse in a PANDA ring resonator is also reviewed. © 2012 Wiley Periodicals, Inc.
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    Blood cleaner on-chip design for artificial human kidney manipulation.
    (2011-11-07)
    Suwanpayak, N.
    ;
    Jalil, M. A.
    ;
    Aziz, M. S.
    ;
    Ismail, F. D.
    ;
    Ali, J.
    A novel design of a blood cleaner on-chip using an optical waveguide known as a PANDA ring resonator is proposed. By controlling some suitable parameters, the optical vortices (gradient optical fields/wells) can be generated and used to form the trapping tools in the same way as optical tweezers. In operation, the trapping force is formed by the combination between the gradient field and scattering photons by using the intense optical vortices generated within the PANDA ring resonator. This can be used for blood waste trapping and moves dynamically within the blood cleaner on-chip system (artificial kidney), and is performed within the wavelength routers. Finally, the blood quality test is exploited by the external probe before sending to the destination. The advantage of the proposed kidney on-chip system is that the unwanted substances can be trapped and filtered from the artificial kidney, which can be available for blood cleaning applications.
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    Radiation self absorption effect in Ar gas NX2 Mather type plasma focus
    (2011-05-02)
    Ali, Z.
    ;
    Lee, S.
    ;
    Ismail, F. D.
    ;
    Saktioto
    ;
    Ali, J.
    The effect of self absorption becomes significant when plasma is dense enough to behave as optically thick. It is essential to account for the effect of self-absorption in that case. The variation of radial trajectory is investigated in this paper. In order to analyze the effect of self absorption of line radiation is investigated in argon plasma by observing the influence of pressure variation of gas. On comparison of the results of numerical experiment considering both aspects i.e. by including and excluding the self absorption term in Lee code an obvious deviation between the trajectories is observed. Last few fractions of seconds (200-300 ns) corroborated the slow compression phase. Results with self absorption showed the compression levels off while without self absorption radiative collapse was observed due to radiative cooling. Due to self absorption the absorbed radiation kept the plasma from radiative collapse turning the results to be more realistic.
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    Thermodynamic equilibrium for nitrogen species discharge: Comparison with global model
    (2011-03-01)
    Ismail, F. D.
    ;
    Saktioto, T.
    ;
    Fadhali, M.
    ;
    Yupapin, P. P.
    ;
    Qindeel, R.
    The equilibrium process of plasma nitrogen species by chemical kinetic reactions along various pressures is successfully investigated. The equilibrium process is required in industrial application to obtain the stable condition when heating up the material for having homogenous reaction. Nitrogen species densities is modeled by a continuity equation and extended Arrhenius form. These equations are used to integrate the change of density over the time. The integration is to acquire density and the reaction rate of each reaction where temperature and time dependence are imposed. A comparison is made with global model within pressure range of 1-100 mTorr and the temperature of electron is set to be higher than other nitrogen species. The results show that the chemical kinetic model only agrees for high pressure because of no power imposed; while the global model considers the external power along the pressure range then the electron and nitrogen species give highly quantity densities by factor of 3-5. © 2010 Elsevier GmbH. All rights reserved.
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    All-optical switches based on GaAs/AlGaAs quantum dots vertical cavity
    (2011-01-01)
    Ismail, F. D.
    ;
    Jomtarak, R.
    ;
    Teeka, C.
    ;
    Ali, J.
    ;
    Yupapin, P. P.
    In this paper, an all-optical switch based on self-assembled GaAs/AlAs quantum dots (QDs) within a vertical cavity is designed and proposed. Two essential aspects of this novel device have been investigated, which include the QD/cavity nonlinearity with appropriately designed mirrors and the intersubband carrier dynamics inside QDs. The vertical-reflection-type switches have been investigated with an asymmetric cavity that consists of 12 periods of GaAs/Al<inf>0.8</inf>Ga<inf>0.2</inf>As and 25 periods for the front and back mirrors, respectively. The thicknesses of the GaAs and AlGaAs layers are chosen to be 89 and 102 nm, respectively. To give a dot-in-a-well (DWELL) structure, the 65 nm dimension of Si was recommended to deposit within a 20 nm AlAs QW. Results obtained have shown that all-optical switching via the QD excited states has been achieved with a time constant down to 275-fs and over 29.5 nm tunable wavelengths. These results demonstrated that QDs within a vertical cavity have great potential to realize low-power, consumption polarization-insensitive and micrometer-sized switching devices for future optical communication and signal processing systems. © 2011 World Scientific Publishing Company.
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    Thermodynamic equilibrium of nitrogen species discharge: Comparison with global model
    (2009-12-01)
    Saktioto
    ;
    Ismail, F. D.
    ;
    Yupapin, P. P.
    ;
    Ali, J.
    The equilibrium process of plasma nitrogen species by chemical kinetic reactions along various pressures is successfully investigated. The equilibrium process is required in industrial application to obtain the stable condition when heating up the material for having homogenous reaction. Nitrogen species densities is modeled by a continuity equation and extended Arrhenius form. These equations are used to integrate the change of density over the time. The integration is to acquire density and the reaction rate of each reaction where temperature and time dependence are imposed. A comparison is made with global model within pressure range of 1- 100mTorr and the temperature of electron is set to be higher than other nitrogen species. The results shows that the chemical kinetic model only agrees for high pressure because of no power imposed; while the global model considers the external power along the pressure range then the electron and nitrogen species give highly quantity densities by factor of 3 to 5.