1. Articles from Gregory Pandraud

    1-6 of 6
    1. Self-aligned micro-optic integrated photonic platform

      Self-aligned micro-optic integrated photonic platform

      In this work, we present the fabrication technology of a monolithically integrated photonic platform combining key components for optical coherence tomography (OCT) imaging, thereby including a photonic interferometer, a collimating lens, and a 45° reflecting mirror that directs the light from the interferometer to the collimator. The proposed integration process simplifies the fabrication of an interferometric system and inherently overcomes the complexity of costly alignment procedures while complying with the necessarily stringent optical constraints. Fabricated waveguide characterization shows total optical losses as low as 3 dB, and less than 1 dB of additional loss due to the Si 45° mirror ...

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    2. Time-domain Optical Coherence Tomography system with integrated delay line for surgical guidance applications

      Time-domain Optical Coherence Tomography system with integrated delay line for surgical guidance applications
      Optical Coherence Tomography is a high resolution imaging technique able to provide in-depth information about living tissue. Among all its applications, it can be argued that surgical guidance is one of the most demanding in terms of system reliability, footprint and cost. In order to enable faster adoption of this technology in that field, we had already developed and demonstrated a new type of scanning delay line based on the thermo-optic effect of silicon. By changing the temperature of an integrated waveguide, we are able to produce a variation in optical delay. In this paper, we demonstrate the inclusion of ...
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    3. Miniature 10 kHz thermo-optic delay line in silicon

      Miniature 10 kHz thermo-optic delay line in silicon
      The scanning delay line is a key component of time-domain optical coherence tomography systems. It has evolved since its inception toward higher scan rates and simpler implementation. However, existing approaches still suffer from drawbacks in terms of size, cost, and complexity, and they are not suitable for implementation using integrated optics. In this Letter, we report a rapid scanning delay line based on the thermo-optic effect of silicon at λ=1.3μm manufactured around a generic planar lightwave circuit technology. The reported device attained line scan rates of 10kHz and demonstrated a scan range of 0.95mm without suffering any ...
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    4. Demonstration of PECVD SiC thermal delay lines for optical coherence tomography in the visible

      Demonstration of PECVD SiC thermal delay lines for optical coherence tomography in the visible
      Optical Coherence Tomography (OCT) has found applications in many fields of medicine and has a large potential for the optical biopsy of tumors. One of the technological challenges impairing faster adoption of OCT is the relative complexity of the optical instrumentation required, which translates into expensive and bulky setups. In this paper we report an implementation of Time-Domain Optical Coherence Tomography based on Plasma Enhanced Chemical Vapor Deposition (PECVD) Silicon Carbide (SiC). The devices, with a footprint of 0.3 cm2, are fabricated using rib waveguides defined in a SiC layer. While most of the components needed are known when ...
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    5. Miniature optical coherence tomography system based on silicon photonics

      Miniature optical coherence tomography system based on silicon photonics
      Optical Coherence Tomography (OCT) is a promising medical imaging technique. It has found applications in many fields of medicine and has a large potential for the optical biopsy of tumours. One of the technological challenges impairing faster adoption of OCT is the relative complexity of the optical instrumentation required, which translates into expensive and bulky setups. In this paper we report an implementation of Time Domain OCT (TD-OCT) based on a silicon photonic platform. The devices are fabricated using Silicon-On-Insulator (SOI) wafers, on which rib waveguides are defined. While most of the components needed are well-known in this technology, a ...
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    6. Thermo-optical delay line for optical coherence tomography

      Thermo-optical delay line for optical coherence tomography
      Optical Coherence Tomography (OCT) is a powerful medical imaging technology. Its ability to non-invasively probe tissues in depth with high resolution has lead to applications in many fields of medicine, with a large potential for surgical guidance. One of the technological challenges impairing faster adoption of OCT is the relative complexity of the corresponding optical instrumentation, which translates into expensive and bulky setups. In this paper a compact fastscanning optical delay line based on the thermo-optical effect of silicon is studied. Although this effect has been applied to other optical components, the necessary frequency behaviour together with the relatively large ...
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    1-6 of 6
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  2. Topics in the News

    1. (6 articles) Delft University of Technology
    2. (6 articles) Eduardo Margallo Balbás
    3. (1 articles) MedLumics
    4. (1 articles) Harvard University
    5. (1 articles) Massachusetts General Hospital
    6. (1 articles) University of North Carolina
    7. (1 articles) Baylor College of Medicine
    8. (1 articles) Masamichi Takano
    9. (1 articles) Joel S. Schuman
    10. (1 articles) Ik-Kyung Jang
    11. (1 articles) Yoshiyasu Minami
    12. (1 articles) Donald L. Budenz
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    Thermo-optical delay line for optical coherence tomography Miniature optical coherence tomography system based on silicon photonics Demonstration of PECVD SiC thermal delay lines for optical coherence tomography in the visible Miniature 10 kHz thermo-optic delay line in silicon Time-domain Optical Coherence Tomography system with integrated delay line for surgical guidance applications Self-aligned micro-optic integrated photonic platform High space-bandwidth in quantitative phase imaging using partially spatially coherent optical coherence microscopy and deep neural network Optical coherence tomography assessment of macrophages accumulation in non-ST-segment elevation acute coronary syndromes Early disability in ambulatory patients with multiple sclerosis: optical coherence tomography versus visual evoked potentials, a comparative study Dueling Deep Q-Network for Unsupervised Inter-frame Eye Movement Correction in Optical Coherence Tomography Volumes Atlas of Optical Coherence Tomography for Glaucoma (Textbook) In-vivo analysis of iron-gold composite nanoparticles as potential exogenous contrast agents for Magnetomotive Optical Coherence Tomography (MMOCT)