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

Lantian Chang, Nicolás Weiss, Ton G van Leeuwen, Markus Pollnau, René M de Ridder, Kerstin Wörhoff, Vinod Subramaniam, Johannes S Kanger

    Research output: Contribution to JournalArticle

    Abstract

    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 the chip and the sample. The use of this lens leads to a signal enhancement up to 37 dB compared to the chip without a lens. The light source, the common-path arm and the detector are connected by a symmetric Y junction having a wavelength independent splitting ratio (50/50) over a much larger bandwidth than can be obtained with a directional coupler. The signal-to-noise ratio of the system was measured to be 71 dB with 2.6 mW of power on a mirror sample at a distance of 0.3 mm from the waveguide end facet. Cross-sectional OCT images of a layered optical phantom sample are demonstrated with our system. A method, based on an extended Fourier-domain OCT model, for suppressing ghost images caused by additional parasitic reference planes is experimentally demonstrated.

    Original languageEnglish
    Pages (from-to)12635-50
    Number of pages16
    JournalOptics Express
    Volume24
    Issue number12
    DOIs
    Publication statusPublished - 13 Jun 2016

      Fingerprint

    Keywords

    • Journal Article

    Cite this

    Chang, L., Weiss, N., van Leeuwen, T. G., Pollnau, M., de Ridder, R. M., Wörhoff, K., ... Kanger, J. S. (2016). Chip based common-path optical coherence tomography system with an on-chip microlens and multi-reference suppression algorithm. Optics Express, 24(12), 12635-50. https://doi.org/10.1364/OE.24.012635