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Chinese Physics B 2019年第8期28卷 167-171页

作者： Syarifah Aloyah Syed Husin Farah Diana Muhammad Che Azurahanim Che Abdullah Siti Huzaimah Ribut mohd Zamani Zulkifli mohd adzir mahdi Department of Physics Faculty of ScienceUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Photonics Research Centre Department of PhysicsUniversity of Malaya50603 Kuala LumpurMalaysia Kulliyyah of Science International Islamic University of MalaysiaJalan Sultan Ahmad ShahBandar Indera Mahkota25200 KuantanPahangMalaysia Wireless and Photonics Networks Research Centre Faculty of EngineeringUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia

A Q-switched erbium-doped fiber laser(EDFL)incorporating zinc-oxide(ZnO)nanoparticles-based saturable absorber(SA)is proposed and *** form the SA,the ZnO nanoparticles,which are originally in the powder form,are first dissolved in ethanol and subsequently deposited onto the surface of fiber ferrule by using the adhesion effect with the evaporation *** integrating the ZnO nanoparticle-based SA into a laser cavity of an EDFL,a self-started and stable Q-switching is achieved at a low threshold power of 20.24 *** the pump power is increased,the pulse repetition rate is tunable from 10.34 kHz to 25.59 kHz while pulse duration decreases from 21.39μs to 3.65μ***,this Q-switched laser has a maximum energy per pulse of 19.34 nJ and an average output power of 0.46 *** results indicate the feasibility and functionality of the ZnO nanoparticles-based SA for Q-switched generation,which offers the flexibility and easy integration of the SA into a ring laser cavity.

关键词： zinc oxide saturable absorber Q-switched fiber laser

Fabrication, characterization and response surface method optimization for quantum efficiency of fluorescent nitrogen-doped carbon dots obtained from carboxymethylcellulose of oil palms empty fruit bunch

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Chinese Journal of Chemical Engineering 2020年第2期28卷 584-592页

作者： Mohammed Abdullah Issa Zurina Zainal Abidin Shafreeza Sobri Suraya Abdul-Rashid mohd adzir mahdi Nor Azowa Ibrahim Musa Y.Pudza Department of Chemical and Environmental Engineering Faculty of EngineeringUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Department of Computer&Communications Systems Engineering Faculty of EngineeringUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Department of Chemistry Faculty of ScienceUniversiti Putra Malaysia43400 SerdangSelangorMalaysia

Bio based nitrogen doped carbon dots(N-CDs)were obtained from empty fruit bunch carboxymethylcellulose and ethylenediamine(EDA)through one-pot hydrothermal carbonization *** optimum as-formed NCDs were thoroughly characterized via Transmission electron microscopy(TEM),high-resolution TEM(HRTEM),Fourier transform infrared(FTIR),X-ray photoelectron spectra(XPS),UV–vis spectra(UV–Vis)and Fluorescence spectra(PL).Response surface methodology was statistically used to assess three independent variables that have major influence on the fluorescence quantum yield(QY),including temperature(230–270℃),time(2–6 h)and EDA mass(10%–23.3%).Based on analysis of variance(ANOVA)results,synthesis temperature was found to be the most influential factor on the QY,followed by time and EDA *** temperature,long synthesis time and high amount of EDA were satisfactorily enough for efficient carbonization conversion rate and obtaining highest QY of *** obtained quadratic model(R^2=0.9991)shows a good correlation between the experimental data and predicted *** optimum synthetic parameters are of 270℃temperature,6 h reaction time and 23.3%of EDA *** optimized as-made N-CDs exhibited blue photoluminescence with both excitation dependent/independent phenomena and high nitrogen *** maximum emission intensity was 426 nm at a maximum excitation wavelength of 320 nm,with a QY of up to 22.9%.XPS and FTIR data confirmed the existence of polar containing groups,such as carbonyl,carboxyl,hydroxyl and amino groups over the surface of N-CDs whereas nitrogen species in the form of(pyridinic and graphitic-N)were introduced in the aromatic carbon domains,which imparts the hydrophilic and photostability of *** into account the low-cost and sustainable production of N-CDs,this method considered a feasible route for converting low quality waste into value-added nanomaterials and utilizing for different functionalization processes and analytical applications.

关键词： Carbon dots Fluorescence Response surface methodology Optimization Nitrogen doped

Mode-locked fiber laser in the C-band region for dual-wavelength ultrashort pulses emission using a carbon nanotube saturable absorber

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Chinese Optics Letters 2019年第5期17卷 30-33页

作者： Kuen Yao Lau Pin Jern Ker Ahmad Fauzi Abas Mohammed Thamer Alresheedi mohd adzir mahdi Electronics Research Group. Institute of Power Engineering Uni ver sit i Tenaga Nasional43000 Kajang SelangorMalaysia Department of Electrical Engineering College of EngineeringKing Saud UniversityRiyadh 11421Kingdom of Saudi Arabia Wireless and Photonics Networks Research Centre Faculty of EngineeringUniversiti Putra Alalaysia43400 UPM Ser dangSelangorJMalaysia

A saturable absorber is commonly employed to generate an ultrashort laser with a mode-locking scheme. In an erbium-doped fiber laser system, the laser regimes of either 1530 or 1550 nm wavelength are procured based on the absorption profile of the erbium-doped fiber. The absorption of the erbium-doped fiber is designed to emit at both wavelengths by controlling the net gain of the laser cavity. Subsequently, simultaneous erbium-doped fiber laser emission is attained at 1533.5 and 1555.1 nm with the pulse duration of 910 and 850 fs, ***, this work maximizes the output portfolios of a mode-locking fiber laser for dual-wavelength ultrashort pulses emission.

关键词： mode-locking scheme C-band region dual-wavelength ultrashort pulses emission using

Broad bandwidth SOA-based multiwavelength laser incorporating a bidirectional Lyot filter

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Chinese Optics Letters 2018年第9期16卷 22-26页

作者： Abdul Hadi Sulaiman Muhammad Zamzuri Abdul Kadir Nelidya Md Yusoff Noran Azizan Cholan Fairuz Abdullah Ahmad Fauzi Abas Mohammed Thamer Alresheedi mohd adzir mahdi Wireless and Photonic Networks Research Center Faculty of Engineering University Putra Malaysia 43400 UPM Serdang Malaysia Institute of Power Engineering Universiti Tenaga Nasional Jalan IKRAM-UNITEN 43000 Kajang Malaysia Department of Physics Kulliyyah of Science International Islamic University Malaysia 25710 Kuantan Malaysia Razak School of Engineering & Advanced Technology Universiti Teknologi Malaysia Kuala Lumpur Jalan Sultan Yahya Petra 54100 Kuala Lumpur Malaysia Department of Communication Engineering Faculty of Electrical and Electronics Engineering Universiti Tun Hussein Onn Malaysia 86400 Batu Pahat Malaysia Department of Electrical Engineering College of Engineering King Saud University Riyadh 11421 Saudi Arabia

We demonstrate a broad bandwidth multiwavelength laser based on a bidirectional Lyot filter and a semiconductor optical amplifier with a mechanism of intensity-dependent loss as the flatness agent. A wide bandwidth of a multiwavelength spectrum of 32.9 nm within a 5 dB uniformity is obtained under optimized polarization param- eters. For this case, the number of generated lasing lines is 329 with a fixed wavelength separation of 0.1 nm. The power stability of this multiwavelength laser is less than 1.35 dB within 200 min time frame. This shows that the bidirectional Lyot filter provides an alternative option for multiwavelength generation in laser systems.

关键词： SOA Broad bandwidth SOA-based multiwavelength laser incorporating a bidirectional Lyot filter PMF HWP

Arsenic Detection Using Surface Plasmon Resonance Sensor With Hydrous Ferric Oxide Layer

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Photonic Sensors 2022年第3期12卷 30-37页

作者： Yasmin MUSTAPHA KAMIL Sura Hmoud AL-REKABI Muhammad Hafiz ABU BAKAR Yap Wing FEN Husam Abduldaem MOHAMMED Nor Hafizah MOHAMED HALIP Mohammed Thamer ALRESHEEDI mohd adzir mahdi inLAZER Dynamics Sdn Bhd InnoHub UnitPutra Science ParkUniversiti Putra MalaysiaSerdang 43400Malaysia Electrical Engineering Department Al Suwayrah Technical InstituteMiddle Technical UniversityBaghdad 10074Iraq Wireless and Photonic Networks Research Centre Faculty of EngineeringUniversiti Putra MalaysiaSerdang 43400Malaysia Institute of Advanced Technology Universiti Putra MalaysiaSerdang 43400Malaysia Department of Physics Faculty of ScienceUniversiti Putra MalaysiaSerdang 43400Malaysia Electronic and Communication Engineering Department College of EngineeringUniversity of BaghdadBaghdad 10071Iraq Department of Electrical Engineering College of EngineeringKing Saud UniversityRiyadh 11421Kingdom of Saudi Arabia

The lethality of inorganic arsenic(As)and the threat it poses have made the development of efficient As detection systems a vital *** research work demonstrates a sensing layer made of hydrous ferric oxide(Fe_(2)H_(2)O_(4))to detect As(Ⅲ)and As(Ⅴ)ions in a surface plasmon resonance *** sensor conceptualizes on the strength of Fe_(2)H_(2)O_(4) to absorb As ions and the interaction of plasmon resonance towards the changes occurring on the sensing *** sensitivity values for As(Ⅲ)and As(Ⅴ)were 1.083°·ppb^(–1) and 0.922°·ppb^(-1),respectively,while the limit of detection for both ions was 0.6 *** findings support the feasibility and potential of the sensor configuration towards paving future advancement in As detection systems.

关键词： Surface plasmon resonance di-iron trioxide hydrate arsenic heavy metals ion optical sensor