A5056229815- Photonic and Optical Devices
- Advanced Fiber Optic Sensors
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Laser Technologies
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Mechanical and Optical Resonators
- Advanced MEMS and NEMS Technologies
- Particle Accelerators and Free-Electron Lasers
- Analytical Chemistry and Sensors
- Laser Material Processing Techniques
- Nanofabrication and Lithography Techniques
- Copper-based nanomaterials and applications
- Microfluidic and Capillary Electrophoresis Applications
- Catalysis and Oxidation Reactions
- Electrowetting and Microfluidic Technologies
- Geophysics and Sensor Technology
- Photonic Crystals and Applications
- Innovative Microfluidic and Catalytic Techniques Innovation
- solar cell performance optimization
- Silicon and Solar Cell Technologies
- Mass Spectrometry Techniques and Applications
- Plasma Diagnostics and Applications
Aschaffenburg University of Applied Sciences
2014-2021
Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute
1995-2002
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 on a femtosecond laser based fabrication technique that enables simultaneous single-step generation of optical waveguides and Bragg gratings inside bulk cyclic olefin copolymers. Due to the nonlinear absorption focused spatially modulated radiation with wavelength 514 nm pulse duration 450 fs, modification concluding refractive index shift increase substrate can be achieved. A sophisticated characterization generated by means an elaborate cut-back method reveals maximum attenuation...
Abstract Femtosecond laser‐based fabrication of integrated photonic crystal waveguides inside a transparent polymer is reported. In general, the based on femtosecond laser‐induced positive refractive index modifications feasible. However, in polymers their performance limited since only minor changes can be achieved with this technique. These restrictions circumvented by generating hexagonal “photonic lattice like” waveguides, which consist negative cladding, enabling light confinement...
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,...
In this study, we report on the integration of microfluidic channels and optical components by focusing femtosecond laser radiation inside transparent cyclic olefin copolymer (COC) bulk material.An internal localized material modification is triggered based nonlinear absorption radiation's high intensities focal volume.The size shape three-dimensional are controlled using an adaptive beam shaping setup.The irradiated areas show a positive refractive index shift can be used as Type I...
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...
This contribution demonstrates the functionality of polymer planar Bragg grating (PPBG) sensors integrated into commercial-grade carbon fiber reinforced (CFRP) components. Multiple CFRP specimens are generated by curing a stack pre-impregnated fibers inside heated mechanical press, exposing sensor to pressure 7 bar and temperature 120 °C for 2 h. After integration, still exhibits strong evaluable signal. Subsequent flexural experiments reveal linear response sensor's wavelength specimen's...
This article proposes and demonstrates a robust microstructure-based fiber-to-chip coupling scheme for planar Bragg grating devices. A polymer substrate is manufactured microstructured by means of micromilling process, while the respective photonic structures are generated employing sophisticated single-writing UV-exposure method. stripped standard single-mode fiber inserted into microstructure, which filled with UV-curable adhesive, aligned integrated waveguide. After curing, final sensor...
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...
Flexible epoxy waveguide Bragg gratings are fabricated on a low-modulus TPX™ polymethylpentene polyolefin substrate for an easy to manufacture and low-cost optomechanical sensor pad providing exceedingly multipurpose application potentials. Rectangular EpoCore negative resist strip waveguides formed employing standard UV mask lithography. Highly persistent inscribed directly into the channel by permanently modifying local refractive indices through well-defined KrF excimer laser irradiated...
We report on the fabrication technology and application capability of an epoxy polymer based lab-on-a-chip (LOC) concept equipped with integrated Bragg grating sensors allowing for on-chip temperature referenced refractive index (RI) measurement fluids. Microfluidic channels as well optical waveguide structures are fabricated in EpoCore / EpoClad epoxy-based photoresists a Topas 6017 cyclo olefin copolymer (COC) substrate using multi-mask UV photolithography. Integrated sensor elements terms...
In this Letter, we report on significantly improved surrounding RI sensitivity of epoxy polymer waveguide Bragg grating sensors. Uniform gratings were generated inside flat rectangular waveguides near the cutoff regime using standard phase mask excimer laser writing. Thickness controlled nanolayers high-index titanium dioxide deposited homogeneously sensor's surface area by repeated reactive sputter processing. Maximum wavelength shifts as high 74.22 nm, well maximum sensitivities around 523...
This study demonstrates and discusses a novel approach for the fabrication rapid prototyping of monolithic photonic platforms comprising ridge-type waveguide with integrated sensing structures. First, bulk injection-molded cyclic olefin copolymer substrates are micromilled in order to define physical extension ridge structure. Cross-sections down 30 × µm 2 , exhibiting mean surface roughness 300 nm, achieved this process. Subsequently, UV radiation is used modify structure’s refractive...
BESSY is proposing a demonstration facility, called STARS, for two-stage high-gain harmonic generation free electron laser (HGHG FEL). STARS planned lasing in the wavelength range 40 to 70 nm, requiring beam energy of 325 MeV and peak current 500 A. The facility consists normal conducting gun, three superconducting TESLA-type acceleration modules modified CW operation, single stage bunch compressor finally HGHG cascaded FEL. This paper describes faciliy layout rationale behind operation parameters.
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...
We demonstrate, for the first time ever, a polymer planar Bragg grating sensor simultaneous multi-axial strain sensing. The containing two perpendicular gratings is used measuring compressive and tensile at different angles.