Evanescent field waveguide sensing with subwavelength grating structures in silicon-on-insulator Academic Article uri icon

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abstract

  • We explore, to the best of our knowledge, the potential of diffractionless subwavelength grating waveguides for sensing applications. We show that by subwavelength patterning of silicon-wire waveguides the field delocalization can be engineered to increase the sensitivity. Fully vectorial 3D-FDTD simulations confirm the sensitivity enhancement, achieving sensitivities of 0.83  RIU/RIU and 1.5·10(-3)  RIU/nm for bulk and surface sensing, respectively, which compare favorably to state-of-the-art sensing waveguides.

authors

  • Gonzalo Wangüemert-Pérez, J
  • Cheben, Pavel
  • Ortega-Moñux, Alejandro
  • Alonso-Ramos, Carlos
  • Pérez-Galacho, Diego
  • Halir, Robert
  • Molina-Fernández, Iñigo
  • Xu, Dan-Xia
  • Schmid, Jens H

publication date

  • August 1, 2014