Bragg filter bandwidth engineering in subwavelength grating metamaterial waveguides Academic Article uri icon

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abstract

  • Bragg gratings are fundamental building blocks for integrated photonic circuits. In the high-index contrast silicon-on-insulator material platform, it is challenging to accurately control the grating strength and achieve narrow spectral bandwidths. Here we demonstrate a novel Bragg grating geometry utilizing a silicon subwavelength grating (SWG) waveguide with evanescently coupled periodic Bragg loading segments placed outside the SWG core. We report experimental 3 dB filter bandwidths in a range from 8 nm to 150 pm by adjusting the distance of the Bragg loading segments from the core and the relative phase shift of the segments on the two sides of the waveguide, with a structure that has a minimum feature size of 100 nm.

authors

  • Cheben, Pavel
  • Čtyroký, Jiří
  • Schmid, Jens H
  • Wang, Shurui
  • Lapointe, Jean
  • Wangüemert-Pérez, J Gonzalo
  • Molina-Fernández, Íñigo
  • Ortega-Moñux, Alejandro
  • Halir, Robert
  • Melati, Daniele
  • Xu, Danxia
  • Janz, Siegfried
  • Dado, Milan

publication date

  • February 15, 2019