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Detection of Salmonella bacterium in drinking water using microring resonator
(2016-01-01)
Bahadoran, Mahdi
;
Noorden, Ahmad Fakhrurrazi Ahmad
;
Mohajer, Faeze Sadat
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Abd Mubin, Mohamad Helmi
;
Chaudhary, Kashif
A new microring resonator system is proposed for the detection of the Salmonella bacterium in drinking water, which is made up of SiO<inf>2</inf>-TiO<inf>2</inf> waveguide embedded inside thin film layer of the flagellin. The change in refractive index due to the binding of the Salmonella bacterium with flagellin layer causes a shift in the output signal wavelength and the variation in through and drop port's intensities, which leads to the detection of Salmonella bacterium in drinking water. The sensitivity of proposed sensor for detecting of Salmonella bacterium in water solution is 149 nm/RIU and the limit of detection is 7 × 10-4RIU.
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Modified add-drop microring resonator for temperature sensing
(2015-10-01)
Mohamad, Azam
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Bahadoran, Mahdi
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Noorden, Ahmad Fakhrurrazi Ahmad
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Aziz, Safwan
;
Chaudhary, Kashif
A micro resonating sensor is proposed for simultaneous measurement of temperature and carrier density using modified Add-drop resonator called PANDA resonator from silicon-on-insulator (SOI) material waveguide. The proposed sensor works by observing the concentration of free-carrier in silicon around room temperature yielding the sensitivity of 1×1023 m-3 C-1 with limit of detection of 10-5 C. It is found that the output intensity decreases due to the photon and thermal absorptions. It is found that the performance of the PANDA sensor is affected by the power at the first coupling region and increase in propagating lengths of PANDA sensor causes a nonlinear effect in carrier density production.
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Rabi oscillation generation in the microring resonator system with double-series ring resonators
(2015-09-10)
Noorden, Ahmad Fakhrurrazi Ahmad
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Chaudhary, Kashif
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Bahadoran, Mahdi
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Aziz, Muhammad Safwan
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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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All-optical hysteresis switching using mobius configuration microring resonator circuit
(2015-01-01)
Noorden, Ahmad Fakhrurrazi Ahmad
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Mohamad, Azam
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Bahadoran, Mahdi
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Chaudhary, Kashif
;
Aziz, M. S.
The novel twisted ring resonator called add-drop Mobius microring resonator is introduced and modelled with the analytical solution of transfer matrix methods for the generation of optical bistability. Simulated results show that, the add-drop Mobius configuration provides greater phase shift due to the longer length of propagation per roundtrip than add-drop filter configuration. In add-drop Mobius system, drop port generated the optical bistable hysteresis loop with 19.25 mW output switching power and through port generated lower switching power as 5.55 mW. The drop port of the system is found as the suitable port for the operating the all-optical hysteresis switching.
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Optical bistability in all-pass mobius configuration microring resonator
(2015-01-01)
Noorden, Ahmad Fakhrurrazi Ahmad
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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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Analytical treatment and modeling of integrated ring resonator device by Z-transform method for signals amplification
(2015-01-01)
Aziz, Safwan
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Bahadoran, Mahdi
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Noorden, Ahmad Fakhrurrazi Ahmad
;
Chaudhary, Kashif
;
Ali, Jalil
Unique configuration of integrated ring resonator circuit were modeled and discussed in this paper. The system consisted series of sub-micron size ring resonators fabricated by using nonlinear InGaAsP/InP material that laterally coupled together. This particular configuration is known as double PANDA ring resonator. For convenience of analysis, optical transfer function for this model is obtained by using Z-transform method. Equations governing pulse propagation within the system including output and circulated fields are discussed in details. Simulation results were based on analytical derivation. It suggested that intensity buildup is induced by the additional nanorings located ad both left and right sides of the system. This study mainly contribute towards the establishment of mathematical model of such system that able to predict accurately the practical operation processes of double PANDA ring resonator configuration.
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Nano force sensing using symmetric double stage micro resonator
(2014-12-01)
Bahadoran, Mahdi
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Noorden, Ahmad Fakhrurrazi Ahmad
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Chaudhary, Kashif
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Safwan Aziz, Muhammad
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Ali, Jalil
A new approach is proposed to improve a graphical approach with considering intensity coupling loss coefficients in the analytical derivation of the optical transfer functions for a symmetric double stage vertically coupled microring resonator. An optimum transmission coupling condition is determined with considering terms of couplers intensity loss which leads to low insertion loss of 1.2 dB, finesse of 1525, the out of band rejection ratio of 61.8 dB. The resonating system is used as an optical force sensing system to make the benefit of the accuracy of measurements in micro and nano scales. The sensitivity of proposed force sensor in terms of wavelength-shift is 33 nm/nN and the limit of detection is 1.6 × 10-2 nN. The proposed sensing system has the advantages of self-calibration and the low power consumption due to the low intensity.
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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
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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 × 10-8 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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