A5090353476- Photonic and Optical Devices
- Advanced Fiber Optic Sensors
- Analytical Chemistry and Sensors
- Semiconductor Lasers and Optical Devices
- Mechanical and Optical Resonators
- Advanced Fiber Laser Technologies
- Advanced Fluorescence Microscopy Techniques
- Electrochemical sensors and biosensors
- Neuroscience and Neural Engineering
- Electrochemical Analysis and Applications
- Laser Material Processing Techniques
- Nonlinear Optical Materials Studies
- Near-Field Optical Microscopy
- Nanofabrication and Lithography Techniques
- Biosimilars and Bioanalytical Methods
- 3D Printing in Biomedical Research
- Advanced biosensing and bioanalysis techniques
- Optical Coatings and Gratings
- Graphene and Nanomaterials Applications
- Microtubule and mitosis dynamics
- Advanced Electron Microscopy Techniques and Applications
- Cell Image Analysis Techniques
- Laser and Thermal Forming Techniques
- Adhesion, Friction, and Surface Interactions
- Advanced Biosensing Techniques and Applications
Charles River Laboratories (United Kingdom)
2025
Aschaffenburg University of Applied Sciences
2014-2024
Frankfurt University of Applied Sciences
2009-2010
Abstract In recent years, the demand for sustainable and degradable materials electronic devices has increased significantly. Among a range of biodegradable polymers, poly(lactic acid) (PLA) is good alternative to conventional petrol-based polymers because its attractive mechanical properties easy processability. Recently, PLA also been described as promising dielectric material with piezoelectric electret properties. We expect that PLA—after further optimization—will play an important role...
Since 2014, the European Bioanalysis Forum has organized Young Scientist Symposium, providing early-career scientists with unique development opportunities. By fostering a peer community, this initiative successfully lowered barriers to engagement in cross-company, pre-competitive interactions. 2018, symposium included Science Café roundtable, further reinforcing Forum's commitment supporting young beyond their scientific expertise by promoting broader professional development.This...
We report on a one-step writing process of planar waveguide including Bragg grating structure in bulk Polymethylmethacrylate (PMMA). A KrF excimer laser and phase mask covered by an amplitude were used to locally increase the refractive index PMMA thereby generate simultaneously grating. Our results show reflected wavelength about 1558.5 nm accordance period. The reflectivity is 80%. Initial characteristics towards humidity are investigated.
A polymer planar Bragg grating sensor is used for measuring both mechanical compressive and tensile strain. The waveguide with integrated fabricated in bulk Polymethylmethacrylate a single writing step using combined amplitude phase mask technique. After butt coupling of single-mode optical fiber the structure can be applied strain alongside without need further modifications. In this respect, we particularly report first time measurements grating. Furthermore, sensitivity against strain,...
We report an optical refractive index sensor system based on a planar Bragg grating which is functionalized by substituted γ-cyclodextrin to determine low concentrations of naphthalene in solvent vapor. The exhibits quasi-instantaneous shift the wavelength and therefore capable for online detection. overall reveals linear relationship analyte concentration with gradient 12.5 ± 1.5 pm/ppm. Due spectral resolution repeatability interrogation system, this corresponds acquisition steps 80 ppb....
In this Letter, we demonstrate a high-temperature stable polymer planar waveguide Bragg grating based on cyclo-olefin copolymers. The high glass transition temperature of the material amounting to 178°C, in conjunction with UV-curable adhesive used connect sensor standard single-mode fiber, enables readings up 160°C while exhibiting sensitivity -7.3 pm/°C. reflected power wavelength remains constant 130°C before declining at higher temperatures an overall reduction 2.5 dB 160°C. However,...
Planar photonic waveguides enable ultrathin sample illumination in fluorescence microscopy over exceedingly large fields of view. Their fabrication has been based on hard coatings requiring sputter deposition and ion-beam lithography, making volume production cumbersome thereby limiting their availability. Additionally, they are typically fabricated top opaque silicon wafers, which restricts the use to upright microscopes. Here, we present a low-cost waveguide chip standard 170 μm thick...
We demonstrate the applicability of a planar waveguide Bragg grating in cyclo-olefin copolymer (COC) for refractive index sensing. The polymer fabricated using single writing step technique is coated with high-index layer titanium dioxide (TiO2) leading to distinct birefringence. This turn results splitting reflection into two wavelengths, which strongly differ regarding their sensitivities. Where one wavelength only slightly affected by ambient index, second peak shows strong sensitivity....
We report on a new optical strain sensor based polymer planar Bragg grating (PPBG). The consists of commercially available bulk Polymethlymethacrylate with UV-inscribed waveguide as well grating, both which are fabricated simultaneously in single writing step. Upon axial strain, the wavelength reveals quasi-instantaneous spectral red shift that depends linearly mechanical load sensitivity 2.95 pm/με. relative reflected intensity PPBG remains constant investigated region.
We demonstrate the application of humidity insensitive polymer planar Bragg gratings written into TOPAS substrates for measuring temperature as well multi-axial tensile and compressive strain. The are realized by a rapid fabrication process using KrF excimer laser which illuminates stacked mask configuration consisting an amplitude phase with grating period 1036.79 nm. determine UV-induced refractive index modification integrated waveguide shifting Mach Zehnder interferometry investigate its...
An evanescent field refractive index sensor consisting of a Bragg grating that is written into silica-on-silicon planar optical waveguide structure by UV laser radiation utilized to monitor the composition liquid binary chemical systems. We have investigated various selected compounds are commonly used in pharmaceutical and industry, finding sensitivities on order 100nm/RIU minimum detectable resolution 5•10<sup>-6</sup> fulfilling industrial demands detection limits partly being...
We report on the application of a silica silicon based planar Bragg grating (PBG) evanescent field sensor as refractive index biosensor. Our results demonstrate that typical biochemical reactions such binding between Biotin (vitamin H) and Streptavidin can be traced in real time surface. For detection Streptavidin, was attached to silanized surface followed by immobilization with concentration 7.5nM, 15nM 30nM, respectively. Real monitoring capability is highlighted interrupting reaction...
In recent years, there has been an increasing interest in electrically conductive hydrogels for a wide range of biomedical applications, like tissue engineering or biosensors. this study, we present cost-effective hydrogel based on alginate and graphene nanoplatelets extrusion-based bioprinters. The is prepared under ambient conditions avoiding high temperatures detrimental cell culture environments. Investigation the revealed conductivity up to 7.5 S/cm, depending ratio platelets....
The increasing dissemination of polymer materials in optics demands for a thorough understanding their optical properties and dependencies on ambient conditions. Here, we report the influence humidity planar Bragg gratings (PPBGs) bulk polymethylmethacrylate (PMMA). We identify contributions both humidity-induced variation grating period refractive index, which turn results spectral shift wavelength. It is demonstrated that saturated PPBGs show change as well rise index resulting strong red...
Bragg gratings have become indispensable as optical sensing elements and are already used for a variety of technical applications. Mainly silica fiber (FBGs) been extensively studied over the last decades nowadays commercially available. grating sensors consisting other materials like polymers, however, only recently come into focus fundamental applied research. Polymers exhibit significantly different properties advantageous many applications therefore provide good alternative to based...
We report on a refractive index sensor based planar Bragg grating (PBG) capable to online monitor the water content in Biodiesel and amount of ethanol admixture conventional fuels, respectively. Our results demonstrate capability distinguish transition between about 190 500 ppm Biodiesel, enabling production process relevant range according industrial standards. The petrol has been investigated 0-100%, covering entire standardized E-5 E-85 fuel mixing ratios. These experiments reveal...
Abstract Graphene is a promising material both as coating for existing neural electrodes well transparent made exclusively from graphene. We studied graphene‐based microelectrodes by investigating their recording and stimulation properties in order to evaluate suitability neuronal implants. In this work, we compare three different electrode compositions. Microelectrode arrays (MEA) with an size of about 700 μm 2 were prepared gold, graphene on plain glass substrate. reduce polymer...
A hollow waveguide array with subwavelength dimensions is demonstrated as a polarization converter. An individual in the has rectangular cross-section, which leads to an anisotropy of propagation constants and therefore phase shift between vertical horizontal field components upon propagation. The was fabricated by two-photon polymerization process followed electrochemical deposition gold. consists about 2000×2500 cells, each 1150 nm×930 nm height 2 μm. With these dimensions, structure can,...
We review our work on polymer planar waveguide Bragg grating (PPBG) sensors and demonstrate their potential for high temperature applications. Our are fabricated with a rapid UV-based single writing step (SWS) technique, which allows the simultaneous inscription of an integrated in substrates. The developed SWS technique is applicable to different materials material properties free selection substrate's geometry. In this contribution, we report PPBG sensor designs application scenarios...
This contribution reviews recent advancements, current research and possible applications of polymer planar Bragg grating (PPBG) sensors with a focus on the utilization cyclic olefin copolymer (COC) substrates. COC-PPBGs can be handled fabricated efficiently by employing single writing step procedure which features simultaneous generation waveguide structure within an injection molded substrate. The resulting photonic structures exhibit attenuation as low 1.2 dB cm <sup...