A5102778300- Photonic and Optical Devices
- Photorefractive and Nonlinear Optics
- Advanced Fiber Laser Technologies
- Nanofabrication and Lithography Techniques
- Advanced MEMS and NEMS Technologies
- Optical Coatings and Gratings
- Metal and Thin Film Mechanics
- Advanced Fiber Optic Sensors
- Nonlinear Photonic Systems
- Advanced Optical Imaging Technologies
- Semiconductor Lasers and Optical Devices
- Mechanical and Optical Resonators
- Material Properties and Applications
- Solid State Laser Technologies
- Plasmonic and Surface Plasmon Research
- Indigenous Studies and Ecology
- Force Microscopy Techniques and Applications
- Surface Roughness and Optical Measurements
- Diamond and Carbon-based Materials Research
- Lubricants and Their Additives
- Microfluidic and Capillary Electrophoresis Applications
- Analytical Chemistry and Sensors
- Mercury impact and mitigation studies
- Polysaccharides and Plant Cell Walls
- Selenium in Biological Systems
Technical University of Denmark
2007-2025
Microsens (Switzerland)
2011
Nordic Laboratory for Luminescence Dating
2003-2006
Roskilde University
2006
Aarhus University
2004-2006
Ilisimatusarfik
2004-2006
University of Kent
1998
Aalborg University
1993
A grating-coupled planar optical waveguide sensor is presented for sensing of bacteria by evanescent waves. The design results in increased depth penetration into the sample volume, which makes it suitable detecting micrometer-sized biological objects. We tested sensor’s performance monitoring adhesion Escherichia coli K12 cells to surface.
This study presents an approach to macroalgae monitoring using a cost-effective hyperspectral imaging (HSI) system and artificial intelligence (AI). Kelp beds are vital habitats support nutrient cycling, making ongoing crucial amid environmental changes. HSI emerges as powerful tool in this context, due its ability detect pigment-characteristic fingerprints that often missed altogether by standard RGB cameras. Still, the high costs of these systems barrier large-scale deployment for situ...
Fabrication of micro- and nanostructures at line-speed 60 m min−1 by large-area roll-to-roll extrusion coating is demonstrated. Nanopillars with diameters 80 nm heights 100 are replicated in polypropylene. The main limiting factor for replication on nanoscale the retardation time solidification melt. As a service to our authors readers, this journal provides supporting information supplied authors. Such materials peer reviewed may be re-organized online delivery, but not copy-edited or...
Reverse symmetry waveguide biosensors employ substrates with a refractive index less than the analyzed aqueous cover sample (1.33). This design offers higher sensitivities for detecting micron scale biological objects such as bacteria and living cells. In present paper, fabrication details of reverse polymer sensors using nanoporous silica 1.2 are presented. Using direct spin-coating deposition films is not feasible, since solvent used to dissolve fills up nanopores leading substrate RI more...
Two types of operation for metal-clad waveguide sensors, peak-type and dip-type operation, are described. The newly discovered [Sens. Actuators B 94, 304 (2003)] can be achieved by use a few-nanometers-thick cladding metal with large imaginary permittivity, whereas conventional is obtained small permittivity some tens nanometers thick. Both described, the main differences illustrated.
A sensor design that uses a grating-coupled multimode planar optical waveguide for absolute detection of the refractive indices liquids or gases is presented. The consists simple 50-microm-thick, free-standing glass plate with air beneath it and sample to be analyzed on top it. This offers alternative well-known monomode waveguides, and, owing its so-called reverse-symmetry configuration, large range can obtained.
A planar optical waveguide configuration is proposed to monitor the buildup of thick polyelectrolyte multilayers on surface in aqueous solutions. Instead detecting layer by electromagnetic evanescent field acts as an additional waveguiding film that sensed guided waves instead waves. This leads a considerably improved sensitivity and dynamic range.
We disclose a simple, optical touch screen technique based on planar injection molded polymer waveguide, single laser, and small linear detector array. The solution significantly reduces the complexity cost as compared to existing technologies. Force detection of touching finger is also demonstrated.
A simple two-particle model of excitons in conjugated polymers is proposed as an alternative to usual highly computationally demanding quantum chemical methods. In the model, exciton described electron-hole pair interacting via Coulomb forces and confined polymer backbone by rigid walls. Furthermore, integrating out transverse part, equation reduced one-dimensional form. It demonstrated how essentially exact solutions are obtained cases short long conjugation length, respectively. From a...
A new method for designing holographic optical elements is presented. The based on matching the grating-spacing profile of recording light interference pattern to desired profile. We show that near-field holograms, in which images involved are close hologram aperture, grating-matching technique superior well-established aberration-balancing introduced by Latta [Appl. Opt. 10, 609 (1971)].
Fouling control coatings (FCCs) are used to prevent the accumulation of marine biofouling on, e.g., ship hulls, which causes increased fuel consumption and global spread non-indigenous species. The standards for performance evaluations FCCs rely on visual inspections, induce a degree subjectivity. use RGB images objective has already received interest from several authors, but limited acquired information restricts detailed analyses class-wise. This study demonstrates that hyperspectral...
This paper investigates a novel, very high throughput, roll-to-roll (R2R) process for nanostructuring of polymer foils, called R2R extrusion coating. It has the potential to accelerate integration nanostructured materials in consumer products variety applications, including optical, technical, and functional surfaces devices. In coating, molten film is extruded through flat die forming melt curtain, then laminated onto carrier foil. The lamination occurs as curtain pressed between cooling...
The continuous introduction of a biological phosphorus removal (BPR) promoting organic substrate to the denitrifying reactor BPR process is examined through series batch experiments using acetate as model substrate. Several observations are made regarding influence availability on PHA storage/utilization and phosphate uptake/release. Under anoxic conditions PHB utilized taken up, indicating that at least fraction PAO can denitrify. rates P-uptake, utilization denitrification found increase...
A color mixing light-emitting diode (LED) light engine that can replace 2-kW halogen–Fresnel spotlight with high-luminous flux in excess of 20,000 lm is reported for applications professional stage and studio lighting. The focuses mixes the from 210 LEDs five different colors through a microlens array (MA) at gate Ø50 mm. Hence, it produces homogeneous color-mixed tunable white 3000 to 6000 K be adjustable flood spot position providing 10% translational loss, whereas corresponding loss 37%....
The stationary solution is obtained for the photorefractive subharmonic gratings excited in crystals of sillenite family by a standing light interference pattern and an applied ac electric field. We show that main with doubled spatial period may become unstable against excitation quadrupled period. threshold condition this bifurcation found.
We have optimized two Ti-compound systems for the largest possible shift in reflectance of visible laser light over a film thickness range 100 nm on basis Fresnel's reflection law and experimental measurements. With model system consisting tribological TiN layer top 50 TiO2 signal bearing steel can be obtained. For second TiAlN 3 µm thick we also demonstrated that changes significantly with decreasing films. The precise thin films was determined combination energy-dispersive x-ray analysis...