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 from the Biomedical Engineering and Physics Department, Academic Medical Center, University of Amsterdam and the Integrated Optical MicroSystems Group, MESA+ Institute for Nanotechnology, University of Twente have carried out research on an integrated optics spectrometer for spectral-domain OCT (SD-OCT).
In this work, an arrayed-waveguide grating (AWG) was designed and fabricated in silicon oxynitride as a spectrometer for SD-OCT. The AWG has a footprint of only 3.0 × 2.5 cm2, operates at a center wavelength of 1300 nm and has 78 nm free spectral range. OCT measurements are performed that demonstrate imaging up to a maximum depth of 1 mm with an axial resolution of 19 μm. Using the AWG spectrometer combined with a fiber-based SD-OCT system, OCT measurements are performed and a cross-sectional OCT imaging of a multi-layered scattering phantom is demonstrated.
For more information see recent Article. Courtesy Jeroen Kalkman, Duc Nguyen, and Imran Acka.