A5017515990- Photonic and Optical Devices
- Photonic Crystals and Applications
- Advanced Fiber Optic Sensors
- Optical Coatings and Gratings
- Plasmonic and Surface Plasmon Research
- Analytical Chemistry and Sensors
- Microwave Engineering and Waveguides
- Atmospheric aerosols and clouds
- Biosensors and Analytical Detection
- Silicon Nanostructures and Photoluminescence
- Mechanical and Optical Resonators
- Advanced Fiber Laser Technologies
- Semiconductor Quantum Structures and Devices
- Microwave and Dielectric Measurement Techniques
- Atmospheric chemistry and aerosols
- Air Quality Monitoring and Forecasting
- Advanced Sensor and Energy Harvesting Materials
- Semiconductor Lasers and Optical Devices
- Gas Sensing Nanomaterials and Sensors
AMS (Austria)
2020-2023
Graz University of Technology
2018-2021
University of Graz
2019
With the application of a recently developed deposition method called initiated chemical vapor (iCVD), responsive hydrogel thin films in order few hundred nanometers were created. When contact with humid air, layer increases its thickness considerably. The measurement change was realized interferometrically laser and broadband light source two different implementations. relative respect to humidity can be described Flory⁻Huggins theory. required interaction parameter determined for actual...
Integrated photonics features applications in high-speed telecommunication, computing, and sensing. These devices are ultimately limited by the optical loss occurring waveguide structures. One of its primary sources is surface-roughness- induced scattering bend-losses. Surface roughness unavoidably introduced during deposition, mainly etching lithographic steps. In photonic integrated circuits, tight bends enable a compact footprint yet increase mode mismatch , radiation loss. Previously,...
Sensors based on the interaction between analytes and evanescent field of a silicon nitride waveguide are emerging in bio-medical environmental applications. We designed implemented first single particle detector this sensor principle that consists with sub-micron dimensions. The detection capabilities prototype were demonstrated polystyrene latex (PSL) spheres equal to or greater than Ø200 nm. Single PSL caused decrease transmission through from 0.2 up 10%, depending their diameter position...
Micro-ring resonators (MRR) are basic photonic components, which serve as crucial building blocks for a variety of devices, e.g. integrated sensors, external cavity lasers, and high speed data transmitters. Silicon nitride platforms particularly appealing in this field application, since waveguide material enables on-chip circuitry with (ultra-) low losses the NIR well across whole visible spectral range. In contribution we investigate key performance properties MRRs wavelength range around...
Detecting and classifying particles over a wide range of types sizes is essential for precise air quality determination. In this study the use optical waveguide-based particle detection examined using finite element method (FEM) based simulations. The simulation model assumes silicon nitride strip waveguide built up in 3D Comsol Multiphysics platform. geometry parameters were varied to identify suitable geometries single-mode wave guidance fundamental quasi-TE quasi-TM modes. with their...
The interaction between analytes and the evanescent field of a waveguide can be exploited for highly sensitive measurement devices, which find already wide usage as chemical biological sensors. Based on this sensor principle, we designed single particle detector, featuring silicon nitride with sub-micron dimensions, diode laser, photodetector. first prototype provides counting efficiency PSL spheres down to diameter 200 nm.
Recent studies on ultrafine particles (UFP), which are smaller than 100 nm, emphasized their hazardous potential to the human organism. They comparable in size typical nano-organisms such as viruses and can penetrate physiological barriers a similar way. Currently, there no low-cost miniaturized detectors for UFP available. In our first experiments with an integrated evanescent field particle detector, we could already successfully detect single 200 nm polystyrene latex (PSL) spheres,...
We have utilized three optical principles in a highly-integrated system to quantify particulates air. The are light scattering, the interaction of particles with evanescent fields, as well photoacoustic QEPAS setup.
Evanescent field particle scattering is a promising tool for single detection. Here we performed detailed analysis to predict feasibility, potential and limitations of this sensing mechanism. First results from analytic estimations as well 2D-simulations the feasibility detection but also highly non-trivial dependence signals on size, shape number particles.
Optical sensors that utilize the evanescent field of an integrated waveguide are applied in a wide range applications. Recently, particle detectors based on dielectric strip waveguides were success- fully used for detection small particles (0 < 1 μm). We present optimizations silicon nitride slab and numerical simulations, which maximize interacts with analyte such as particles. The fraction total light power is transmitted evanes- cent region can be tuned by geometric parameters operation...
Measurements of the width-dependent propagation loss 250 nm thick silicon nitride strip waveguides at 850 wavelength indicate good agreement with theoretical model. The were fabricated by plasma-enhanced chemical vapor deposition (PECVD).
With the application of a recently developed deposition method called initiated chemical vapor (iCVD), remarkably fast responsive hydrogel thin films in order few hundred nanometers were created. When contact with humid air, layer extends its thickness manifold, which can be detected. The verification change was realized interferometrically laser and white light input source two different implementations. setup designed without electric components vicinity active sensor is therefore...