Anti-reflection subwavelength gratings for InP-based waveguide facets Journal Articles uri icon

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  • We demonstrate the anti-reflection properties of lithographically defined subwavelength gratings applied to the facets of integrated waveguides realized in the InP membrane-on-silicon platform. The subwavelength gratings are based on the gradient index effect to create a smooth index transition between the core material and air, making it possible to obtain reflections below 30 d B at a wavelength of 1550 nm for both TE and TM polarized modes, as shown by 3D finite-difference time-domain simulations. Characterizations performed using Mach–Zehnder interferometers as test structures show relative reflections as low as 25 d B , confirming the effectiveness of the technique.


  • Puts, Lukas
  • Leijtens, Xaveer
  • Cheben, Pavel
  • Schmid, Jens
  • Reniers, Sander
  • Melati, Daniele

publication date

  • August 1, 2021