1. Markus Pollnau

    0 Comments Leave a Comment

    1-12 of 12
    1. Mentioned In 12 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 ...
      Read Full Article
    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 ...
      Read Full Article
    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 ...
      Read Full Article
    5. Spectral-domain optical coherence tomography on a silicon chip (Thesis)

      Spectral-domain optical coherence tomography on a silicon chip (Thesis)
      Optical coherence tomography (OCT) is a non-invasive optical technique for high-resolution cross-sectional imaging of specimens, with many applications in clinical medicine and industry (e.g. materials testing, quality assurance, and process control). Current state-of-the-art OCT systems operate in the frequency domain, using either a broad-band light source and a spectrometer, known as spectral-domain OCT (SD-OCT), or a rapidly tunable laser, known as swept-source OCT (SS-OCT). Both systems contain a multitude ...
      Read Full Article
    6. 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 ...
      Read Full Article
    7. 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 ...
      Read Full Article
    8. 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 ...
      Read Full Article
    9. 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 ...
      Read Full Article
    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 ...
      Read Full Article
    11. PhD Position Memphis-SiON

      Ph.D. Vacancy (4 years): Novel integrated optical devices based on SiON Job Description: In our research group optical waveguides and novel integrated optical structures based on silicon oxynitride (SiON) are intensively studied for application in optical sensing, optical communication, medicine, antenna beam steering, etc. In a current national project, MEMPHIS (http://www.smartmix -memphis. nl/), a photonic integration platform based on SiON is set-up that provides know-how, technology, devices ...
      Read Full Article
    12. Ph.D. Vacancy

      (4 years): Novel integrated optical devices based on SiON Job Description: In our research group optical waveguides and novel integrated optical structures based on silicon oxynitride (SiON) are intensively studied for application in optical sensing, optical communication, medicine, antenna beam steering, etc. In a current national project, MEMPHIS (http://www.smartmix -memphis. nl/), a photonic integration platform based on SiON is set-up that provides know-how, technology, device
      Read Full Article
    13. 1-12 of 12
  1. Categories

    1. Applications:

      Art, Cardiology, Dentistry, Dermatology, Developmental Biology, Gastroenterology, Gynecology, Microscopy, NDE/NDT, Neurology, Oncology, Ophthalmology, Other Non-Medical, Otolaryngology, Pulmonology, Urology
    2. Business News:

      Acquisition, Clinical Trials, Funding, Other Business News, Partnership, Patents
    3. Technology:

      Broadband Sources, Probes, Tunable Sources
    4. Miscellaneous:

      Jobs & Studentships, Student Theses, Textbooks
  2. About Markus Pollnau

    Markus Pollnau

    Markus Pollnau received the M.Sc. degree from the University of Hamburg, Hamburg, Germany, in 1992 and the Ph.D. degree from the University of Bern, Bern, Switzerland, in 1996, both in physics.  After postdoctoral positions with the University of Southampton and the University of Bern, he was a Project and Research Group Leader with the Swiss Federal Institute of Technology, Lausanne, Switzerland. In 2004, he was appointed a full Professor and Chair of the Integrated Optical MicroSystems Group, University of Twente. He has contributed to more than 350 reviewed journal and international conference papers and six book chapters in the fields of crystal and thin-film growth, rare-earth-ion spectroscopy, solid-state and fiber lasers, and waveguide fabrication, devices, and applications. He has held European, Swiss, and Dutch personal fellowships and has obtained numerous national and European research grants. He has been involved in the organization of major international conferences, e.g., as Program and General Co-chair of the Conference on Lasers and Electro-Optics (2006/2008) and the Conference on Lasers and Electro-Optics Europe (2009/2011), and served as Topical Editor for the Journal of the Optical Society of America B. Prof. Pollnau is a member of the European Physical Society and the Optical Society of America.