1. Kerstin Wörhoff

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    1. Mentioned In 11 Articles

    2. Chip based common-path optical coherence tomography system with an on-chip microlens and multi-reference suppression algorithm

      Chip based common-path optical coherence tomography system with an on-chip microlens and multi-reference suppression algorithm
      We demonstrate an integrated optical probe including an on-chip microlens for a common-path swept-source optical coherence tomography system. This common-path design uses the end facet of the silicon oxynitride waveguide as the reference plane, thus eliminating the need of a space-consuming and dispersive on-chip loop reference arm, thereby obviating the need for dispersion compensation. The on-chip micro-ball lens eliminates the need of external optical elements for coupling the light between ...
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    3. Miniature spectrometer and beam splitter for an optical coherence tomography on a silicon chip

      Miniature spectrometer and beam splitter for an optical coherence tomography on a silicon chip
      Optical coherence tomography (OCT) has enabled clinical applications that revolutionized in vivo medical diagnostics. Nevertheless, its current limitations owing to cost, size, complexity, and the need for accurate alignment must be overcome by radically novel approaches. Exploiting integrated optics, we assemble the central components of a spectral-domain OCT system on a silicon chip. The spectrometer comprises an arrayed-waveguide grating with 136-nm free spectral range and 0.21-nm wavelength resolution. The ...
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    4. Advanced integrated spectrometer designs for miniaturized optical coherence tomography systems

      Advanced integrated spectrometer designs for miniaturized optical coherence tomography systems
      Optical coherence tomography (OCT) has enabled clinical applications that revolutionized in vivo medical diagnostics. Nevertheless, its current limitations owing to cost, size, complexity, and the need for accurate alignment must be overcome by radically novel approaches. Exploiting integrated optics, the central components of a spectral-domain OCT (SD-OCT) system can be integrated on a chip. Arrayed-waveguide grating (AWG) spectrometers with their high spectral resolution and compactness are excellent candidates for on-chip ...
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    5. Feature Of The Week 6/3/12: Towards OCT On a Chip - A Hard Goal but One that Could Eventually Revolutionize OCT Systems and Applications

      Feature Of The Week 6/3/12: Towards OCT On a Chip - A Hard Goal but One that Could Eventually Revolutionize OCT Systems and Applications
      Miniaturization of Optical Coherence Tomography (OCT) systems is one of the most exciting and promising areas for instrumentation research and offers tremendous commercial potential. While there has been progress over the past decade in reducing the size and cost of OCT systems, the future of truly compact and low-cost OCT systems, such as a one chip solution, has not been realized. The potential of the core of an OCT system ...
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    6. Polarization-Independent Enhanced-Resolution Arrayed-Waveguide Grating Used in Spectral-Domain Optical Low-Coherence Reflectometry

      Polarization-Independent Enhanced-Resolution Arrayed-Waveguide Grating Used in Spectral-Domain Optical Low-Coherence Reflectometry
      The performance of an arrayed-waveguide grating (AWG) as an integrated spectrometer in spectral-domain optical low-coherence reflectometry (SD-OLCR) is significantly improved. By removing the output waveguides of the AWG, the depth range is enhanced from 1 to 3.3 mm at 800 nm and 4.6 mm at 1300 nm. Periodic signal fading, that was previously observed in the sensitivity roll-off curve in depth ranging measurements, is shown to be evoked ...
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    7. Performance Improvement and Birefringence Investigation of Spectral Domain Optical Coherence Tomography Using a Modified Arrayed Waveguide Grating

      Performance Improvement and Birefringence Investigation of Spectral Domain Optical Coherence Tomography Using a Modified Arrayed Waveguide Grating
      An arrayed-waveguide grating (AWG) with its high accuracy and stability is a powerful tool for spectral analysis. We investigate its potential for spectral-domain optical coherence tomography (SD-OCT). A silicon-oxynitride-based AWG spectrometer for the 800 nm wavelength range is designed for on-chip SD-OCT systems. By removing the output waveguides of the AWG, the depth range is significantly enhanced. In addition, the effect of polarization dependency of the AWG on sensitivity roll-off ...
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    8. Toward Spectral-domain Optical Coherence Tomography on a Chip

      Toward Spectral-domain Optical Coherence Tomography on a Chip
      We present experimental results of a spectraldomain optical coherence tomography system based on an integrated optical spectrometer. A 195-channel arrayedwaveguide- grating (AWG) spectrometer with 0.4-nm channel spacing centered at 1300 nm and a 125-channel AWG with 0.16-nm channel spacing centered at 800 nm have been fabricated in silicon oxynitride waveguide technology. Interferometric distance measurements have been performed by launching light from a broadband source into a free-space Michelson ...
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    9. Silicon oxynitride technology for integrated optical solutions in biomedical applications

      Silicon oxynitride technology for integrated optical solutions in biomedical applications
      Silicon oxynitride, a dielectric material with excellent optical properties, is applied for a wide range of integrated optical devices operating at visible or NIR wavelengths. High-quality channel waveguides are reliably fabricated by plasma enhanced chemical vapor deposition and reactive ion etching following standard lithography. Based on a general, polarization-independent channel waveguide layout various arrayed waveguide gratings were designed, realized and tested for on-chip spectrometers in Raman detection and optical coherence ...
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    10. Feature Of The Week 5/29/11: Researchers at University of Twente and University of Amsterdam Investigate Miniaturization of SD-OCT Systems using Integrated Optics

      Feature Of The Week 5/29/11: Researchers at University of Twente and University of Amsterdam Investigate Miniaturization of SD-OCT Systems using Integrated Optics
      Optical coherence tomography (OCT) is an interferometric imaging technique which has developed rapidly over the last 20 years and has many applications in biomedical optics. Current OCT systems consist of a large number of bulk optical components and are quite expensive. Thus integration of optical components is expected to make OCT systems smaller and more cost efficient.Within the MEMPHIS project (Merging Electronics and Micro & Nano-Photonics in Integrated Systems), researchers ...
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    11. SiON Integrated Optics Elliptic Couplers for Fizeau-Based Optical Coherence Tomography

      SiON Integrated Optics Elliptic Couplers for Fizeau-Based Optical Coherence Tomography
      Integrated optics potentially can offer significant cost reductions and new applications to Optical Coherence Tomography (OCT). We design, fabricate, and characterize Silicon oxynitride (SiON) elliptic couplers, which can be used to focus light from a chip into the off-chip environment. Fizeau-based OCT measurements are performed with elliptic couplers and a moveable mirror. The optical fields at the output of the elliptic coupler are simulated and measured. Good agreement is observed ...
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    12. 1-11 of 11
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  2. About Kerstin Wörhoff

    Kerstin Wörhoff

    Kerstin Wörhoff received the M.Sc. degree in optoelectronics from the Technical University of Bratislava, Bratislava, Slovak Republic, in 1991 and the Ph.D. degree in applied physics from the University of Twente, Enschede, The Netherlands, in 1996. In 1996, she joined the Lightwave Devices Group (now Integrated Optical MicroSystems Group, MESA+ Institute for Nanotechnology), University of Twente, as a Postdoctoral Researcher. Since 2000, she has been an Assistant Professor with the same group. Her research interest covers the field of active and passive silicon-based photonics technology, rare-earth-ion doped devices, and integrated optical waveguide design.