A5009042720- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Laser Technologies
- Diamond and Carbon-based Materials Research
- Nanowire Synthesis and Applications
- Advanced Surface Polishing Techniques
- Organic Electronics and Photovoltaics
- Photopolymerization techniques and applications
- Metal and Thin Film Mechanics
- Polymer Nanocomposites and Properties
- Advanced optical system design
- Semiconductor materials and devices
- Laser Material Processing Techniques
- Solid State Laser Technologies
- Thin-Film Transistor Technologies
- Mobile Learning in Education
- Hydrogels: synthesis, properties, applications
- Synthesis and properties of polymers
- Tunneling and Rock Mechanics
- Integrated Circuits and Semiconductor Failure Analysis
- Electronic and Structural Properties of Oxides
- Polymer Nanocomposite Synthesis and Irradiation
- solar cell performance optimization
- Epoxy Resin Curing Processes
- Optical Coatings and Gratings
Quest International University Perak
2024
Wawasan Open University
2016-2021
Universiti Tunku Abdul Rahman
2010-2016
University of Strathclyde
2005-2008
National Yang Ming Chiao Tung University
2002-2004
This work studies and presents an inner-interface trapping physical model for the ultra-thin (effective oxide thickness=15 Å) zirconium (ZrO2) film to explain its hysteresis phenomenon. The shift of capacitance–voltage characteristics swept from accumulation inversion then back with light illumination is about 110 mV, which larger than without (∼45 mV). mobile ion effect obviated using bias-temperature stress measurement. proposed successfully explains not only phenomenon but also thickness...
We report a 1.055-mum microchip VECSEL array which uses microlens-patterned diamond both as heatspreader and an of concave output mirrors. This configuration, is suitable for laser operation, here exploited to perform systematic study set lasers with the same semiconductor structure but different cavity properties. The transverse mode selection individual VECSELs found depend on mode-matching conditions microlens aperture size. Mode-matched single-device emission in fundamental (M2~1.1)...
We demonstrate the use of a High Reflectivity Grating (HRG) as an intra-cavity element in Semiconductor Disk Laser (or Vertical External Cavity Surface Emitting Laser) to stabilise its emission wavelength and polarization characteristics. Operation at 1058nm with up 645mW pump-limited output power M(2)~1.4 is achieved. also show that this scheme permits tunable single-frequency operation.
We report for the first time a UV curable polymer with effective optical transmission below 300 nm. Through careful control of kinetics, various viscosities can be generated to optimize film forming properties via spin coating. The monomers and films is investigated over spectral range which spans 240–370 nm output ultraviolet AlInGaN light-emitting diodes. refractive index has been measured by ellipsometry give value 1.57 at 280 Using standard lithography techniques reactive ion etching,...
We report a detailed study of an array-format 1.055- mum microchip semiconductor disk laser which uses microlens-patterned diamond both as array stabilizing output coupling mirrors and heatspreader. A thermal the devices, using finite element analysis, is carried out confirms management capabilities power scalability this microlensed configuration. This design then exploited to perform systematic on set lasers having same structure but microlenses with differing characteristics. The...
Power-scaling of an optically pumped 1040-nm microlensed microchip semiconductor disk laser is reported, where the monolithic cavity and lens structure embodied in single-crystal diamond. Low threshold circularly symmetric single-transverse-mode emission (M <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> <1.2) at output power up to 180 mW obtained for a mode-matched device having integrated coupler 9.4-mm radius curvature 300-mum...
ABSTRACT Superabsorbent polymers (SAPs) were synthesized by grafting acrylic acid and butyl acrylate onto carboxymethyl cellulose (CMC) modified from Ceiba pentandra (L.) Gaertn. (kapok) cotton, with N , ′‐methylenebisacrylamide as a crosslinker ammonium persulphate initiator. The effect of distilled water, saline solution, applied pressure on superabsorbent was investigated. product exhibited the maximum water absorbency 554 g/g in 96 solution. SAP achieved highest under load 83 7.6 g/cm 2...
The capacitance–voltage (C–V) characteristics of hafnium oxynitride gate dielectrics for silicon metal-oxide-semiconductor (MOS) capacitors with different sweep voltage were investigated. It was found that, the p-type substrate MOS capacitor, C–V hysterisis has a turnaround characteristic as applied exceeds −3.0 V. phenomenon is explained by electron trappings at low electric field and hole trappings, which resulted from impact ionization, high in dielectrics.
The effect of butyl acrylate (BA), divinyl benzene (DVB) and vinyltrimethoxysilane (TMVS) on the thermal properties poly(methyl methacrylate-co-butyl acrylate-co-acrylic acid) was investigated. Glass transition temperature (Tg), melting (Tm) specific heat capacity copolymers were investigated using Differential Scanning Calorimetry. Thermal stability which is associated with degradation (Td) studied by Thermogravimetric Analysis. Polyacrylates Tg ranges between -19°Cand 19°C obtained. With...
The transmission characteristics of Si-based 1D photonic crystals was investigated using transfer matrix method. As the temperature and wavelength dependence Si refractive index induces band edge resonant modes that are tunable, average shift per Kelvin mode with largest group determined in vicinity edge. A general linear chirp structure consisting a constant component implemented. Using simulated annealing algorithm, structural parameters were optimized it found can be enhanced by 28.9%...
The properties of amorphous carbon films deposited by magnetron sputtering deposition process was analyzed and characterized with the intention realizing an excellent design subsequently to manufacture high performance X-ray mirror utilizing carbon-carbon multilayer stack. study is focused on density variation as parameters are changed. experiment has shown a convincing result that various densities can be achieved layer changing conditions. By installing aluminum grating in system order...
This paper demonstrates a plano-concave microchip vertical-external cavity emitting laser (mu-VECSEL) operating at 1.05 mum. The is composed of semiconductor structure, comprising an active region grown on top distributed Bragg reflector (DBR), and diamond heatspreader with its outer surface shaped as spherical microlens. stable optical has signal spot diameter ~19.8 mum the ~21 concave micro-mirror facet.