A5018319680- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Laser Technologies
- Advanced Fiber Optic Sensors
- Optical Network Technologies
- Advanced Photonic Communication Systems
- Optical Coherence Tomography Applications
- Advanced biosensing and bioanalysis techniques
- Photonic Crystals and Applications
- Advanced Biosensing Techniques and Applications
- Nanofabrication and Lithography Techniques
- Optical Coatings and Gratings
- Biosensors and Analytical Detection
- Advanced Fluorescence Microscopy Techniques
- Analytical Chemistry and Sensors
- Semiconductor Quantum Structures and Devices
- Molecular Junctions and Nanostructures
- Advanced Optical Network Technologies
- Microfluidic and Capillary Electrophoresis Applications
- Plasmonic and Surface Plasmon Research
- Thin-Film Transistor Technologies
- Electrochemical sensors and biosensors
- Retinal and Macular Surgery
- Mechanical and Optical Resonators
- Monoclonal and Polyclonal Antibodies Research
Austrian Institute of Technology
2015-2024
Vorarlberg University of Applied Sciences
2024
Seibersdorf Laboratories (Austria)
2005-2007
Austrian Research Centre for Forests
2007
Fujitsu (Japan)
2001-2004
Österreichisches Forschungsinstitut für Chemie und Technik
2002
National Institution for Academic Degrees and Quality Enhancement of Higher Education
2001
The University of Tokyo
2000
TU Wien
1996-2000
University of Applied Sciences Technikum Wien
1996-1997
In this work, we present a detailed analysis of individual loss mechanisms in silicon nitride partial Euler bends at wavelength 850 nm. This structure optimizes the transmission through small radii optical waveguide bends. The bend geometry balances losses arising from transition straight to mode and radiative mode. Numerical analyses are presented for 45-degree commonly employed S-bend configurations create lateral offsets, as well 90- 180-degree Additionally, 90-degree were fabricated on...
Abstract In this work, we present a significant step toward in vivo ophthalmic optical coherence tomography and angiography on photonic integrated chip. The diffraction gratings used spectral-domain can be replaced by circuits comprising an arrayed waveguide grating. Two grating designs with 256 channels were tested, which enabled the first chip-based three-dimensional human retinal measurements. Design 1 supports bandwidth of 22 nm, sensitivity up to 91 dB (830 µW ) axial resolution 10.7 µm...
In this numerical study, we show that by exploiting the advantages of horizontal silicon slot wave-guide structure nonlinear interaction can be significantly increased compared to vertical waveguides. The deposition a 20 nm thin optically layer with low refractive index sandwiched between two wires 220 width and 205 height could enable nonlinearity coefficient gamma more than 2 x 10(7) W(-1)km(-1).
We present a CMOS-compatible silicon nitride (Si3N4) waveguide technology platform suitable for monolithic co-integration with optoelectronics in the visible and <1.1 μm near infrared wavelength region. With an optimized fabrication process employing low-temperature plasma enhanced chemical vapour deposition (PECVD) reactive ion etching (RIE), propagation losses of 0.86 dB/cm were achieved at λ=850 nm wire waveguides cross section 600x250 nm2. As example application we show Mach-Zehnder...
A complementary cell analysis method has been developed to assess the dynamic interactions of tumor cells with resident tissue and immune using optical light scattering impedance sensing shed on behavior. The combination electroanalytical biosensing technologies integrated in a lab-on-a-chip allows for continuous, label-free, noninvasive probing cell-to-cell between adherent nonadherent cocultures, thus providing real-time insights into responses under physiologically relevant conditions....
Lateral flow devices (LFDs) allow for low-cost decentralized testing with a short time to result and are therefore an indispensable tool point-of-care diagnostics. Here, we report on novel LFD electrochemical readout the quantitative detection of C-reactive protein (CRP), known biomarker inflammation, in filtered human saliva demonstrate possibility simultaneous multichannel measurements. The CRP is enabled by sandwich assay target specific capture antibodies immobilized nitrocellulose...
In this letter, we theoretically investigate the potential for further improvement of slot waveguide structure in silicon-on-insulator at a wavelength 1550 nm. Waveguide thickness and width, as well are optimized with respect to optical power confined region by taking into account modal behavior structure. A single-mode criterion is defined function geometry parameters
The fabrication of flexible low-loss, thin-film, foil-based polymer waveguides with grating couplers employing a high-volume industrial roll-to-roll process is demonstrated. embossed feature propagation losses less than 1 dB/cm (633 nm, TE polarization), bending 0.4-0.8 dB/360° for radii as small 2 mm, and coupling efficiencies up to 25%. In addition, the possess thermo-optic coefficient -1.58×10(-4) 1/°C. fabricated are promising candidates short-distance data communication well sensing...
We report a new method for detecting human IgG (hIgG) in serum on integrated-optical Mach-Zehnder interferometer biosensors realized high index contrast polymer material system. In the linear range of sensor (5–200 nM) we observed excellent signal recoveries (95–110%) buffer and samples, which indicate absence matrix effects. Signal enhancement was reached by using secondary anti-human antibodies, bind to immobilized target IgGs allow concentrations down 100 pM. This based optical is fully...
This numerical study investigates the influence of rectangular backside diffraction gratings on efficiency silicon solar cells. Backside are used to diffract incident light large propagation angles beyond angle total internal reflection, which can significantly increase interaction length long wavelength photons inside layer and thus enhance efficiency. We investigate thickness optimum grating period modulation depth by a simulation method combines 2D ray tracing algorithm with rigorous...
For anticancer therapy and disease prognosis in breast cancer, three PIK3CA point-mutations (H1047R, E545K, E542K) play a significant role. To allow for specific sensitive detection of these with hybridization-based concept, the assay conditions were optimized on microarray technology platform. The resulting fluorescence-based enables simultaneous point-mutations. protocol was then adapted use screen-printed gold-plated silver sensor array twelve working electrodes, one common counter...
The sensitivity of bimodal waveguides for integrated optical biosensors is compared to single mode and grating-assisted interferometers are proposed as improved sensor concept. Grating-assisted an elegant compact concept, which features easy fabrication overcomes typical weaknesses classical Mach-Zehnder interferometers. Long period gratings conversion in the concept have been simulated employing FDTD method. Such give full control over power distribution modes, not possible with other...
Biotin- and iminobiotin-bonded surfaces obtained by thiol–ene chemistry subsequent modification with polyamines were characterized respect to streptavidin-binding capacity reversibility for photonic biosensing using X-ray photoelectron spectroscopy Mach–Zehnder-interferometric sensors. The streptavidin–iminobiotin system was exploited reversible multilayer deposition determination of affinity constants on each layer.
In this letter, the influence of metal films and dielectric waveguides on radiation characteristics light emitting diodes (LEDs) is investigated. Cross hexagonal surface grating structures are used to excite plasmons waveguide modes in these media. A beam divergence as small 17° achieved for a coated with 40 nm Ag film. The maximum quantum efficiency found 10-nm-thick Au film 250-nm-thick layer. optical power emitted by LED into solid angle from −30° 30° 10% higher than that an without
The effect of a thin high-index coating deposited on polyimide waveguide grating couplers was investigated. A comprehensive numerical study performed using an efficient simulation tool based Floquet-Bloch algorithm, and the results this were compared with experimentally obtained values for input coupling efficiencies. application permits from narrow beams even in material systems low index difference. This not only facilitates denser integration but also low-loss lateral tapering to...
Silicon nitride based photonic integrated circuits offer a wavelength operation window in the near infrared down to visible light, which makes them attractive for life science applications.However, they exhibit significantly different behavior comparison better established silicon on insulator counterparts due lower index contrast.One of most important building blocks are broadband couplers with defined coupling ratio.We present asymmetric directional coupler designs 50/50 and 90/10...
The optimization of material gain in optically pumped dye-doped polymer thin films is an important task the development organic solid-state lasers. In this work, we present a theoretical model that accommodates influence concentration quenching on and employ it to study novel dye molecule 2-(4-(bis(4-(tert-butyl)phenyl)amino)benzylidene)malononitrile (PMN) well-established 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM) embedded poly(methyl methacrylate) (PMMA)....
In this paper, we present a novel concept for multi-channel swept source optical coherence tomography (OCT) system based on photonic integrated circuits (PICs). At the core of is low-loss polarization dependent path routing approach allowing lower excess loss compared to previously shown PIC-based OCT systems, facilitating parallelization measurement units. As proof routing, silicon nitride single-channel operating at 840 nm was implemented and used acquire in-vivo tomograms human retina....
Abstract Photonics integrated circuits (PICs) represent a promising technology for the much-needed medical devices of today. Their primary advantage lies in their ability to integrate multiple functions onto single chip, thereby reducing complexity, size, maintenance requirements, and costs. When applied optical coherence tomography (OCT), leading tool state-of-the-art ophthalmic diagnosis, PICs have potential increase accessibility, especially scenarios, where weight, or costs are limiting...