A5036001617- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Advanced Fiber Optic Sensors
- Optical Network Technologies
- X-ray Diffraction in Crystallography
- CO2 Sequestration and Geologic Interactions
- Crystallization and Solubility Studies
- Photonic Crystal and Fiber Optics
- Hydrocarbon exploration and reservoir analysis
- Semiconductor Lasers and Optical Devices
- Mechanical and Optical Resonators
- Enhanced Oil Recovery Techniques
- CCD and CMOS Imaging Sensors
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Orbital Angular Momentum in Optics
- Bone health and osteoporosis research
- Advanced Photonic Communication Systems
- Diamond and Carbon-based Materials Research
- Graphene research and applications
- 3D IC and TSV technologies
- Hydraulic Fracturing and Reservoir Analysis
- Lanthanide and Transition Metal Complexes
- Medical Imaging Techniques and Applications
- Particle Detector Development and Performance
Technical University of Denmark
2017-2024
Chongqing University
2022-2024
Shenzhen University
2022
Ørsted (Denmark)
2019
Danish Geotechnical Society
2018
Institut de Microélectronique, Electromagnétisme et Photonique
2018
Shanghai Institute of Microsystem and Information Technology
2018
China Iron and Steel Research Institute Group
2017
University College London
2014-2015
Nankai University
2014
Self-assembly of graphene oxide (GO) nanosheets into strong and hierarchically porous 3D sponges is a promising approach to exploit their capacity adsorb contaminants while facilitating the recovery from treated water.
Silicon carbide (SiC) exhibits promising material properties for nonlinear integrated optics.We report on a SiC-on-insulator platform based crystalline 4H-SiC and demonstrate high-confinement SiC microring resonators with sub-micron waveguide cross-sectional dimensions.The Q factor of in such dimension is improved by six after surface roughness reduction applying wet oxidation process.We achieve high (73,000) devices show engineerable dispersion from normal to anomalous controlling the...
We demonstrate enhanced four-wave mixing (FWM) in high-quality factor, high-confinement 4H-SiC microring resonators via continuous-wave FWM. With the large power buildup effect of resonator, -21.7 dBFWM conversion efficiency is achieved with 79 mW pump power. Thanks to strong light confinement SiC-on-insulator (SiCOI) waveguides submicrometer cross-sectional dimensions, a high nonlinear parameter wγ 7.4±0.9 W-1 m-1 obtained, from which refractive index (n2) estimated be (6.0±0.6)×10-19 m2/W...
The 140 GHz silicon micromachined bandpass rectangular waveguide filters are firstly fabricated by the deep reactive ion etching (DRIE) processes for submillimeter wave applications. filter circuit structure is once-formed using ICP etcher to etch through full thickness of wafer, and then bonded together with two metallized glass covers form cavity. measured lowest insertion losses lower than 0.5 dB. unloaded quality factor can reach 160. It demonstrates a successful practical way fabricate...
We realize an AlGaAs-on-sapphire platform through Al <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> -assisted direct wafer bonding and substrate removal processes. The process is optimized concerning the intermediate layer deposition annealing temperature to obtain a high strength between AlGaAs sapphire wafers. High quality-factor (Q) microring resonators are fabricated using...
CO2–shale interaction performs a crucial role in determining the capacity and leakage risk of CO2 storage shale reservoirs. In this paper, alterations physical chemical properties triggered by are reviewed, then implications for sequestration formations discussed. induced mineral further pore structure alterations. The mainly controlled dissolution/precipitation extraction adsorption swelling shale, which is closely related to reservoir pressures temperatures. Furthermore, may also influence...
For successful CO2 storage in underground reservoirs, the potential problem of leakage needs to be addressed. A profoundly improved understanding behavior fractured cement under realistic subsurface conditions including elevated temperature, high pressure and presence saturated brine is required. Here, we report situ X-ray micro computed tomography (μ-CT) studies visualizing microstructural changes upon exposure cured Portland with an artificially engineered path (cavity) at pressure....
Wafer-scale CMOS active pixel sensors (APSs) have been developed recently for x-ray imaging applications. The small pitch and low noise are very promising properties medical applications such as digital breast tomosynthesis (DBT). In this work, we evaluated experimentally through modeling the of a 50 μm APS detector named DynAMITe (Dynamic Range Adjustable Medical Imaging Technology). A modified cascaded system model was detectors by taking into account device nonlinear signal properties....
Integration of heterogeneous materials is crucial for many nanophotonic devices. The integration often achieved by bonding using polymer adhesives or metals. A much better and cleaner option direct wafer bonding, but the high annealing temperatures required make it a less attractive option. Direct relies on density hydroxyl groups surfaces, which may be difficult to achieve depending materials. Thus, challenge design universal process. However, an intermediate layer between surfaces reduces...
Recent advances in integrated nonlinear material platforms and low-loss optical microresonators enabled a broad range of chip-scale applications, such as frequency combs, quantum photonics, signal processing. The aluminum gallium arsenide-on-insulator (AlGaAsOI) platform exhibiting high nonlinearity, strong light confinement, negligible two-photon absorption has motivated research realizing highly efficient components. Low loss dispersion engineering are essential for processes waveguides...
We describe imbibition in real and artificial plant seeds, using a combination of experiments theory. In both systems, our demonstrate that liquid permeates the substrate at rate which decreases gradually over time. Tomographic imaging soy seeds is used to confirmed this by observation permeating an iodine stain. To rationalize experimental data, we propose model based on capillary action predicts temporal evolution radius wet front seed mass. The depth wetting initially evolves as $t^{1/2}$...
We report on the nonlinear characterizations of titanium dioxide micro-ring resonators (TiO 2 MRRs). By utilizing optimized fabrication processes, high quality factors (Q∼1.4 × 10 5 ) doubling that previous work are achieved here for TiO MRRs with high-confinement waveguides. The four-wave mixing (FWM) experiment results low and signal power demonstrate that, fabricated can perform broadband (∼40 nm) wavelength conversion cascaded FWMs. These achievements pave way key photonic applications...
Recently CMOS active pixels sensors (APSs) have become a valuable alternative to amorphous silicon and selenium flat panel imagers (FPIs) in bio-medical imaging applications. APSs can now be scaled up the standard 20 cm diameter wafer size by means of reticle stitching block process. However, despite scale APS being monolithic, sources non-uniformity response regional variations persist representing significant challenge for sensor response. Non-uniformity stitched arise from number factors...
Recently, many methods based on amplitude or phase modulation to reduce the focal spot and enhance longitudinal field component of a tight-focused radially polarized light beam have been suggested. But they all suffer from size limit 0.36λ/NA large side lobes strength in component. Here, we report method generating tighter focused by focusing azimuthally beams different wavelengths thin photochromic film through high-numerical-aperture lens simultaneously. In this method, suppressing radial...
Exploring new frequency bands for optical transmission is essential to overcome the capacity crunch. The 2-µm band becoming a research spotlight due available broadband thulium-doped fiber amplifiers as well low-latency, low-loss hollow-core fibers. Yet most of devices designed communication are still in their infancy. In this Letter, we propose wavelength conversion based on four-wave mixing highly nonlinear AlGaAsOI nanowaveguide bridge and conventional bands. Due strong light confinement...
Titanium dioxide ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:msub> <mml:mi mathvariant="normal">T</mml:mi> mathvariant="normal">i</mml:mi> mathvariant="normal">O</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msub> </mml:math> ) microring resonators (MRRs) with high quality factors (Qs) are demonstrated by using a new, to the best of our knowledge, bottom-up fabrication method. Pattern platforms T-shaped cross section...
Direct wafer bonding is a key enabling technology for many current and emerging photonic devices. Most prior work on direct has, however, focused the Si platform fabrication of silicon-on-insulator (SOI) micro-electromechanical systems (MEMS). As result, universal solution heterogeneous material has not yet been developed. This roadblock in realization novel devices which need integration new semiconductor platforms such as III-V Si, Ge Sapphire, LiNbO<sub>3</sub> GaAs etc. The large thermal...
Microring resonators (MRRs) with ultracompact footprints are preferred for enhancing the light-matter interactions to benefit various applications. Here, titanium dioxide ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="m1"> <mml:mrow> <mml:msub> <mml:mi>TiO</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msub> </mml:math> ) MRRs sub-10-μm radii experimentally demonstrated. Thanks large refractive index of id="m2"> , quality factors up id="m3"> <mml:mo...