Subwavelength index engineered surface grating coupler with sub-decibel efficiency for 220-nm silicon-on-insulator waveguides Journal Articles uri icon

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  • Surface grating couplers are fundamental components in chip-based photonic devices to couple light between photonic integrated circuits and optical fibers. In this work, we report on a grating coupler with sub-decibel experimental coupling efficiency using a single etch process in a standard 220-nm silicon-on-insulator (SOI) platform. We specifically demonstrate a subwavelength metamaterial refractive index engineered nanostructure with backside metal reflector, with the measured peak fiber-chip coupling efficiency of -0.69 dB (85.3%) and 3 dB bandwidth of 60 nm. This is the highest coupling efficiency hitherto experimentally achieved for a surface grating coupler implemented in 220-nm SOI platform.


  • Benedikovic, Daniel
  • Cheben, Pavel
  • Schmid, Jens H
  • Xu, Dan-Xia
  • Lamontagne, Boris
  • Wang, Shurui
  • Lapointe, Jean
  • Halir, Robert
  • Ortega-Moñux, Alejandro
  • Janz, Siegfried
  • Dado, Milan

publication date

  • August 24, 2015