Spiral-path high-sensitivity silicon photonic wire molecular sensor with temperature-independent response Journal Articles uri icon

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  • We demonstrate a new silicon photonic wire waveguide evanescent field (PWEF) sensor that exploits the strong evanescent field of the transverse magnetic mode of this high-index-contrast, submicrometer-dimension waveguide. High sensitivity is achieved by using a 2 mm long double-spiral waveguide structure that fits within a compact circular area of 150 microm diameter, facilitating compatibility with commercial spotting apparatus and the fabrication of densely spaced sensor arrays. By incorporating the PWEF sensor element into a balanced waveguide Mach-Zehnder interferometer circuit, a minimum detectable mass of approximately 10 fg of streptavidin protein is demonstrated with near temperature-independent response.


  • Densmore, A
  • Xu, D-X
  • Janz, S
  • Waldron, P
  • Mischki, T
  • Lopinski, G
  • Delâge, A
  • Lapointe, J
  • Cheben, Pavel
  • Lamontagne, B
  • Schmid, JH

publication date

  • March 15, 2008