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Author: search.filters.author.Aziz, Muhammad Safwan

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    Rabi oscillation generation in the microring resonator system with double-series ring resonators
    (2015-09-10)
    Noorden, Ahmad Fakhrurrazi Ahmad
    ;
    Chaudhary, Kashif
    ;
    Bahadoran, Mahdi
    ;
    Aziz, Muhammad Safwan
    ;
    Jalil, Muhammad Arif
    In this paper, a microring resonator (MRR) system using double-series ring resonators is proposed to generate and investigate the Rabi oscillations. The system is made up of silicon-on-insulator and attached to bus waveguide which is used as propagation and oscillation medium. The scattering matrix method is employed to determine the output signal intensity which acts as the input source between two-level Rabi oscillation states, where the increase of Rabi oscillation frequency with time is obtained at the resonant state. The population probability of the excited state is higher and unstable at the optical resonant state due to the nonlinear spontaneous emission process. The enhanced spontaneous emission can be managed by the atom (photon) excitation, which can be useful for atomic related sensors and single-photon source applications.
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    Optical bistability in all-pass mobius configuration microring resonator
    (2015-01-01)
    Noorden, Ahmad Fakhrurrazi Ahmad
    ;
    Bahadoran, Mahdi
    ;
    Chaudhary, Kashif
    ;
    Aziz, Muhammad Safwan
    ;
    Jalil, Muhammad Arif
    A novel design of microring resonator called all-pass Mobius ring resonator is used to study optical bistability effect and spectral transmission for all-optical switching application with clockwise hysteresis loop operation. The bright soliton pulse is applied as the input source of the system. The propagation of the pulses within the system is simulated using the transfer matrix analysis. The all-pass Mobius ring resonator is able to operate under high nonlinearity as it has longer propagation length per roundtrip. The all-pass Mobius provides low transmission peak power of 3.65 mW as compared to the conventional all-pass configuration. The output-to-input relation of both design shows that the Mobius configuration is able to generate a higher hysteresis loop width of the bistable signal from 15.79 mW to 18.10 mW input power. The switching power of the optical bistability in Mobius configuration is 3.67 mW for threshold power of 16.95mW. This work shows the Mobius configuration is more suitable to be used for all-optical switching application as compared to the conventional all-pass ring resonator configuration.
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    Modeling and analysis of a microresonating biosensor for detection of salmonella bacteria in human blood
    (2014-07-18)
    Bahadoran, Mahdi
    ;
    Noorden, Ahmad Fakhrurrazi Ahmad
    ;
    Chaudhary, Kashif
    ;
    Mohajer, Faeze Sadat
    ;
    Aziz, Muhammad Safwan
    A new photonics biosensor configuration comprising a Double-side Ring Add-drop Filter microring resonator (DR-ADF) made from SiO2-TiO2 material is proposed for the detection of Salmonella bacteria (SB) in blood. The scattering matrix method using inductive calculation is used to determine the output signal's intensities in the blood with and without presence of Salmonella. The change in refractive index due to the reaction of Salmonella bacteria with its applied antibody on the flagellin layer loaded on the sensing and detecting microresonator causes the increase in through and dropper port's intensities of the output signal which leads to the detection of SB in blood. A shift in the output signal wavelength is observed with resolution of 0.01 nm. The change in intensity and shift in wavelength is analyzed with respect to the change in the refractive index which contributes toward achieving an ultra-high sensitivity of 95,500 nm/RIU which is almost two orders higher than that of reported from single ring sensors and the limit of detection is in the order of 1 × 10<sup>-8</sup> RIU. In applications, such a system can be employed for a high sensitive and fast detection of bacteria. © 2014 by the authors; licensee MDPI, Basel, Switzerland.
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    Filter design using multi-bragg reflectors
    (2012-12-27)
    Ismail, Fairuz Diyana
    ;
    Aziz, Muhammad Safwan
    ;
    Teeka, Chat
    ;
    Ali, Jalil
    ;
    Yupapin, Preecha Phromphan
    In this paper, we present the use of mathematical modeling of dielectric mirror known as known as Bragg reflector for optical design. A device system consists of the identical alternating layers using high and low refractive indices. Results obtained have shown that the model applications such as quarter-wavelength layers, unequal-length layers, short-pass and long-pass filters, and transmission filter design can be simulated and plotted.