High-efficiency conversion from waveguide mode to an on-chip beam using a metamaterial engineered Bragg deflector Journal Articles uri icon

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  • Diffraction gratings that redirect light propagating in a channel waveguide to an on-chip slab are emerging as important building blocks in integrated photonics. Such distributed Bragg deflectors enable precise shaping of slab confined beams for a variety of applications, including wavelength multiplexing, optical phased array feeding, and coupling interfaces for on-chip point-to-point communications. However, these deflectors suffer from significant losses caused by off-chip radiation. In this Letter, we show, for the first time, to the best of our knowledge, that off-chip radiation can be dramatically reduced by using the single-beam phase matching condition and subwavelength metamaterial refractive index engineering. We present a deflector design with losses below 0.3 dB, opening a path toward new applications of distributed Bragg deflectors in integrated photonics.


  • Hadij-ElHouati, Abdelfettah
  • Cheben, Pavel
  • Ortega-Moñux, Alejandro
  • Wangüemert-Pérez, J Gonzalo
  • Halir, Robert
  • de-Oliva-Rubio, José
  • Schmid, Jens H
  • Molina-Fernández, Iñigo

publication date

  • May 15, 2021