A5057736367- Advanced Fiber Optic Sensors
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Semiconductor Lasers and Optical Devices
- Optical Network Technologies
- Nonlinear Optical Materials Studies
- Analytical Chemistry and Sensors
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced Photonic Communication Systems
- Plasmonic and Surface Plasmon Research
- Photonic Crystals and Applications
- Gas Sensing Nanomaterials and Sensors
- Quantum Information and Cryptography
- Solid State Laser Technologies
- Nanoplatforms for cancer theranostics
- Phase-change materials and chalcogenides
- Graphene research and applications
- Laser-Matter Interactions and Applications
- Radiation Detection and Scintillator Technologies
- Molecular Junctions and Nanostructures
- Laser Material Processing Techniques
- Terahertz technology and applications
- Meteorological Phenomena and Simulations
- MXene and MAX Phase Materials
University of Malaya
2015-2024
Australian National University
2022
Universiti Malaysia Perlis
2017
University of Glasgow
2012
Institute of High Energy Physics
2005
University of Science and Technology of China
2001
We have demonstrated a broadband waveguide polariser with high extinction ratio on polymer optical coated graphene oxide via the drop-casting method. The highest of nearly 40 dB is measured at 1590 nm, variation 4.5 across wavelength range from 1530 nm to 1630 that (to our knowledge) reported for graphene-based polarisers date. This result achieved coating length along propagation direction only 1.3 mm and bulk film thickness 2.0 µm. underlying principles strongly polarisation dependent loss...
The optical characteristics of graphene oxide (GO) were explored to design and fabricate a GO-based humidity sensor. GO film was coated onto SU8 polymer channel waveguide using the drop-casting technique. proposed sensor shows high TE-mode absorption at 1550 nm. Due dependence dielectric properties on water content, this decreases when ambient relative increases. rapid response (<1 s) periodically interrupted humid air flow. transmission linear 0.553 dB/% RH in range 60% 100% RH.
A microfibre device integrating a knot resonator in Sagnac loop reflector is proposed for refractive index and temperature sensing. The reflective configuration of this optical structure offers the advantages simple fabrication ease To achieve balance between responsiveness robustness, entire embedded low Teflon, except 0.5–2 mm diameter sensing region. sensor has exhibited linear spectral response with index. small change free range observed when experiences large surrounding medium. found...
Abstract Increased absorption of transverse-magnetic (TM) - polarised light by a graphene-oxide (GO) coated polymer waveguide has been observed in the presence transverse-electric (TE) light. The GO-coated exhibits very strong photo-absorption TE-polarised and acts as TM-pass polariser. absorbed causes significant temperature increase GO film induces thermal reduction GO, resulting an optical-frequency conductivity consequently increased optical propagation loss. This behaviour gives action...
Previous studies indicated that the SARS-CoV-2 virus and COVID-19 vaccines may contribute to idiopathic sudden sensorineural hearing loss (ISSNHL). This nationwide study sought evaluate correlation between infection vaccination with ISSNHL. case–control analysed samples from adults aged 18 years older who visited otorhinolaryngology department in 32 government hospitals Malaysia for pure tone audiometry(PTA) January 25, 2020 June 30, 2022. Cases comprised patients diagnosed ISSNHL, while...
Generally, in a waveguide-based humidity sensors, increasing the relative (RH) causes cladding refractive index (RI) to increase due water absorption. However, if graphene oxide (GO) is used, reverse phenomenon seen gap layers. In this paper, interesting property applied order fabricate differential sensor using difference between RI of reduced GO (rGO) and nano-anatase TiO2 chip. First, new approach proposed prepare high quality solution form making fabrication process simple...
A Ti <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> AlC xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> MAX phase-based saturable absorber (SA) is successfully demonstrated to induce passive Q-switching in an erbium-doped fiber laser (EDFL) at the 1.5 μm region. The -PVA film fabricated using solution casting method and incorporated into cavity which uses a 0.89 m long erbium doped as gain medium. Stable self-starting Q-switched...
This letter reports a fiber optic sensing technology for the detection of salinity and liquid level given solution. The operation principle is based on displacement measurement in large measuring range by generating variety outputs various objectives. proposed sensor investigated analytically experimentally. achieved sensitivity 8.589/%, addition, exhibits an excellent 0.4421/mm experiment.
We have explored the polarization behavior of MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> at three different wavelengths using a polymer-based waveguide. The -coated waveguide has been fabricated based on drop casting method. maximum extinction ratio 12.6 dB that is achieved 980 nm considered to be highest, best our knowledge, for -based polarizer. It exhibits transverse electric (TE) pass characteristics in visible wavelength...
Abstract This work has demonstrated the potential of a reduced graphene oxide silver/polyvinyl alcohol (rGO-Ag/PVA) film as saturable absorber (SA) in ytterbium and erbium based Q-switched optical fiber lasers. The facile hydrothermal method was used to synthesize nanocomposite between rGO Ag nanoparticles. followed by simple solution form rGO-Ag using PVA host polymer. From nonlinear absorption characterization, rGO-Ag/PVA SA determined have modulation depth 30%, nonsaturable loss 70%,...
Abstract A wide-band and tunable Q-switched erbium-doped fiber (EDF) laser operating at 1560.5 nm with a tungsten ditelluride (WTe 2 ) saturable absorber (SA) is demonstrated. The semi-metallic nature of WTe as well its small band gap excellent nonlinear optical properties make it an SA material. cavity uses 89.5 cm long EDF, pumped by 980 diode the linear gain while based generates pulsed output. has modulation depth, non-saturable loss saturation intensity about 21.4%, 78.6%, 0.35 kW/cm...
A high sensitivity pressure sensor design without a polymer transducer is demonstrated in this paper. The uses thin metal diaphragm as instead of polymer. tested to maximum 100 psi and has 0.0115 nm/psi, which matches the calculated 0.0127 nm/psi. provides accurate measurement shows good repeatability its readings. also at flow loop University Tulsa, match with readings loop.
An on-chip optical humidity sensor using Nano-anatase TiO₂ coating is presented here. The material was prepared so that the result in solution form, making fabrication process quick and simple. Then, effortlessly spin-coated on an SU8 straight channel waveguide. Investigating sensitivity performance (response time) of device revealed a great linearity wide range (35% to 98%) relative (RH). In addition, variation more than 14 dB transmitted power observed, with response time only ~0.7 s....
Abstract A critical factor in developing an efficient photosensitizer‐gold nanoparticle (PS‐AuNP) hybrid system with improved plasmonic photosensitization is to allocate a suitable space between AuNPs and PS. Poly(amidoamine) (PAMAM) dendrimer selected as spacer the PS confeito‐like gold nanoparticles (confeito‐AuNPs), providing required distance (≈2.5‒22.5 nm) for plasmon‐enhanced singlet oxygen generation heat production upon 638‐nm laser irradiation increase cellular internalization of...
Abstract A new pressure sensor based on fiber Bragg gratings (FBG), is described with high‐pressure sensitivity. The configured by embedding the FBG in a polymer‐field aluminum casing an opening one side, which exposed to measurand. measured response 0.06 nm/psi that ∼2700 times higher than bare FBG. linearity of designed also shown be good at pressures below 50 psi. This has numerous potential applications area low‐pressure measurements. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol...
When an optical fiber is dipped in etching solution, the internal stress profile varies with diameter. We observed a physical contraction as much 0.2% axial dimension when was reduced from its original diameter to ~6 µm through analysis using high resolution microscope images of grating period etched FBG at different diameters. This related varying reduced. On top that, refractive index core increases reducing due stress-optic effect. The calculated increment 1.8 × 10(-3) center after down...
A configurable optical waveguide polarizer using graphene oxide (GO) as a polarizing element has been demonstrated. The propagation characteristics of the GO-coated are changed from TM-pass to TE-pass by controlling GO coating thickness in sub-micron range during deposition process. highest extinction ratio measured for is 34.9 dB, length and 1.0 mm <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.34~\mu...
Abstract On‐chip stimulated Brillouin scattering (SBS) in arsenic trisulfide (As 2 S 3 ) planar waveguides lead to a range of outstanding demonstrations microwave photonics signal generation and processing. However, the lack other integrated functionalities, high back reflections, large in‐ out‐fiber coupling losses index contrast cause number serious impairments lessen applicability photonic devices. In this report, hybrid integration scheme is demonstrated where As optimized for SBS gain...