title: Temperature-independent silicon subwavelength grating waveguides.
abstract: We demonstrate, by experiment and numerical calculations, temperature-independent subwavelength grating waveguides with a periodic composite core composed of alternating regions of silicon and SU-8 polymer. The polymer has a negative thermo-optic (TO) material coefficient that cancels the large positive TO effect of the silicon. Measurements and Bloch mode calculations were carried out over a range of silicon-polymer duty ratios. The lowest measured TO coefficient at a wavelength of 1550 nm is 1.8×10(-6) K(-1); 2 orders of magnitude smaller than a conventional silicon photonic wire waveguide. Calculations predict the possibility of complete cancellation of the silicon waveguide temperature dependence.
authors.affiliation: Institute for Microstructural Sciences, National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada. jens.schmid@nrc‐cnrc.gc.ca
authors.forename: J H
authors.initials: JH
authors.lastname: Schmid
authors.forename: M
authors.initials: M
authors.lastname: Ibrahim
authors.forename: P
authors.initials: P
authors.lastname: Cheben
authors.forename: J
authors.initials: J
authors.lastname: Lapointe
authors.forename: S
authors.initials: S
authors.lastname: Janz
authors.forename: P J
authors.initials: PJ
authors.lastname: Bock
authors.forename: A
authors.initials: A
authors.lastname: Densmore
authors.forename: B
authors.initials: B
authors.lastname: Lamontagne
authors.forename: R
authors.initials: R
authors.lastname: Ma
authors.forename: W N
authors.initials: WN
authors.lastname: Ye
authors.forename: D-X
authors.initials: DX
authors.lastname: Xu