Nanopixel Waveguide Polarization Rotator Towards Integrated CRDS Breath Sensor for Self-Lasing Suspension

DOI IR (HANDLE) Open Access
  • Sara Bruhier
    Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
  • Jiang Haisong
    Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
  • Hamamoto Kiichi
    Interdisciplinary Graduate School of Engineering Sciences, Kyushu University

Description

In the context of an aging global population, breath analysis offers a non-invasive method to assess health. One approach uses Cavity Ring-Down Spectroscopy (CRDS), where an optical amplifier compensates for feedback loop loss. However, the self-lasing phenomenon (arising when coherency is secured at a wavelength other than the sensing light) reduces device sensitivity. To mitigate this, a polarization rotator is introduced in the ring cavity, ensuring amplification benefits only the sensing light. As we develop an integrable CRDS system on a Silicon-On-Insulator (SOI) platform, we demonstrate that a 90° polarization rotation is crucial. SOI nanopixel waveguides with two converters and air holes can achieve an 86° to 94° rotation over a 20-nm wavelength range, with insertion loss manageable by the EDFA. A hole diameter of 70 nm offers a balance between reduced loss and efficient mode conversion, though larger holes may enhance mode confinement, particularly for TE10 and TM00 modes.

Journal

Keywords

Details 詳細情報について

  • CRID
    1390865265012166912
  • DOI
    10.5109/7323413
  • HANDLE
    2324/7323413
  • ISSN
    24341436
  • Text Lang
    en
  • Data Source
    • JaLC
    • IRDB
  • Abstract License Flag
    Allowed

Report a problem

Back to top