A5055434890- Photonic and Optical Devices
- Luminescence Properties of Advanced Materials
- Glass properties and applications
- Photorefractive and Nonlinear Optics
- Photonic Crystals and Applications
- Solid State Laser Technologies
- Advanced Fiber Optic Sensors
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Laser Technologies
- Semiconductor Quantum Structures and Devices
- Quantum Dots Synthesis And Properties
- Ferroelectric and Piezoelectric Materials
- Nonlinear Optical Materials Studies
- Quantum and electron transport phenomena
- Lanthanide and Transition Metal Complexes
- Analytical Chemistry and Sensors
- Nonlinear Optical Materials Research
- Semiconductor materials and devices
- Optical Coatings and Gratings
- Silicone and Siloxane Chemistry
- Nanowire Synthesis and Applications
- Silicon Nanostructures and Photoluminescence
- Acoustic Wave Resonator Technologies
- Microwave Dielectric Ceramics Synthesis
- Advancements in Semiconductor Devices and Circuit Design
Nanyang Technological University
2009-2020
GlobalFoundries (United States)
2013
Institute of Modern Physics
2009
Zhejiang University
2009
Zhejiang Normal University
2009
Agency for Science, Technology and Research
2008
National University of Singapore
1984-2003
Nanyang Institute of Technology
1976
In this Letter, the optical properties of randomly positioned silicon nanowire arrays are studied. The result shows that position randomization with a filling ratio larger than 36% renders better absorptance over broadband ranging from 300 to 1130 nm compared regular structures. ultimate efficiency 48% randomized structure is 13.4% higher optimized regularly arranged same thickness. enhancement random structures attributed lowered reflectance, more supported resonant modes, and broadening...
We foresee applications and interesting possibilities of incorporating the photonic crystals concept into superconducting electronics. In this paper, we present features computed lower band structure a nondissipative superconductor-dielectric superlattice using two-fluid model transcendental equation [Pochi Yeh, Optical Waves in Layered Media, Wiley Series Pure Applied Optics (Wiley, New York, 1988)]. The necessary conditions for approximating complex conductivity by an imaginary is derived...
SiO 2 colloid crystal infilled with BaTiO3 was synthesized by a process of self-assembly in combination sol–gel technique. It is found that infilling the fully crystallized into assembly can enhance photonic band gap significantly. In vicinity ferroelectric phase transition point (100–150 °C), exhibits strong temperature dependence. At Curie point, has 20 nm redshift, and optical transmittance reaches its minimum. Such temperature-tuning effect should be high interest device applications.
In this paper, the optical properties of silicon nano-cone-hole (NCH) structure array are studied. The ultimate efficiency optimized NCH is enhanced by 23.11% compared to an nanohole same thickness. absorptance enhancement arrays attributed its lowered reflectance, more supported resonant modes, and mode interaction. angular dependence also investigated.
ZnS:Mn has been in-filled in photonic crystals of submicron polymer spheres. The effect the band gap on photoluminescence (PL) properties investigated. Because overlap transmission dip crystal and ZnS:Mn, both suppression enhancement PL phosphor have observed. A strong dependence fluorescence lifetime emission wavelength range stop found. This is believed to arise from very low photon density state within as result a high dielectric contrast between polystyrene
Cu-doped ZnS nanocrystals were prepared in an inverse microemulsion at room temperature as well under a hydrothermal condition. X-ray diffraction analysis showed that the diameter of particles was about 9 nm. These strong photoluminescence intensity and broad emission band from 490 to 530 The half-width 60 nanocrystals/polymethylmethacrylate composite light-emitting layer used fabricate single structure electroluminescent device which had low turn on voltage (less than 5 V). green light...
Green upconversion emissions at 548 and 528 nm have been obtained from sol-gel derived nanocrystalline Er3+:BaTiO3 films under 980 excitation. The green are attributed to the ground-state (4I15/2) -directed transitions H11/22 (528 nm) S3/22 (548 of Er3+ ions. Analysis temporal evolution emission shows that both excited state absorption individual ion energy transfer between two neighboring ions contribute in (3 mol %):BaTiO3 film. lifetime dominant is about 90 μs.
In this paper we study electronic transport through a quantum dot array containing an arbitrary number of dots connected in series by tunnel coupling under dc bias. The on-site Coulomb interaction is ignored. retarded self-energy any the made up left and right components staircase type, terminating at corresponding electron reservoirs. We calculate current based on nonequilibrium Green's function formalism developed Jauho et al. [A.-P. Jauho, Ned S. Wingreen, Y. Meir, Phys. Rev. B 50, 5528...
In this paper, we report our results on the sol–gel preparation and spectral properties of (RExY1−x)2SiO5 (RE3+ = Eu3+, Tb3+, Ce3+, x 0.005, 0.01, 0.02, 0.03 0.05) thin films. Effects annealing temperatures films structure optical properties, including luminescence, decay kinetics CIE colour coordinates have been investigated. Upon exposure to UV source, containing Eu3+ Tb3+ exhibited bright red- green-phosphorescent colours, due prominent transitions 5D0→7F2 at 613 nm 5D4→7F5 543 arising...
Neodymium (III) oxide nanocrystals synthesized by the inverse microemulsion technique were dispersed in sol–gel titania/organically modified silane (ormosil) composite thin films for photonic applications. X-ray diffraction analysis and transmission electron microscopy observation show that neodymium nanoparticles have a nanocrystalline structure size of is range 5–60 nm. An intense room-temperature yellow-to-violet upconversion emission at 402 nm (4D3/2→4I13/2) was measured from film heated...