Athermal silicon waveguides with bridged subwavelength gratings for TE and TM polarizations

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  • Ye, Winnie N.
  • Ibrahim, Marc
  • Schmid, Jens H.
  • Aleali, Alireza
  • Cheben, Pavel
  • Lapointe, Jean
  • Janz, Siegfried
  • Bock, Przemek J.
  • Densmore, Adam
  • Lamontagne, Boris
  • Ma, Rubin
  • Xu, Dan-Xia




In this paper, athermal silicon waveguides using bridged subwavelength grating (BSWG) structures are proposed and investigated. The realization of temperature-independent BSWG waveguides for both polarizations is demonstrated numerically and experimentally. SU-8 polymer is used as the cladding material to compensate for the positive thermo-optic (TO) coefficient (dn/dT) of silicon. We investigate the dependence of the effective TO coefficient of BSWG waveguides on both the bridge width and grating duty cycle. The BSWG waveguides have a width of 490 nm, a height of 260 nm, and a grating pitch of 250 nm. Athermal behavior is achieved for both the transverse-magnetic (TM) and the transverse-electric (TE) polarized light for a variety of bridge width and duty cycle combinations. Furthermore, the BSWGs can be designed to be athermal for both TE and TM polarization simultaneously.


Optics Express

Peer Review: 

Published in Peer Reviewed Journal

Faculty Name: 

Faculty of Engineering and Design

Department Name: 

Department of Electronics

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