title: Thermal stress implications in athermal TiO2 waveguides on a silicon substrate.
abstract: Ring resonators with TiO2 core confinement factors from 0.07 to 0.42 are fabricated and measured for thermal sensitivity achieving -2.9 pm/K thermal drift in the best case. Materials used are CMOS compatible (TiO2, SiO2 and Si3N4) on a Si substrate. The under discussed role of stress in thermo-optic behavior is clearly observed when contrasting waveguides buried in SiO2 to those with etched sidewalls revealed to air. Multiphysics simulations are conducted to provide a theoretical explanation of this phenomenon in contrast to the more widely reported theories on thermo-optic behavior dominated by confinement factor.
authors: Jock
authors: J
authors: Bovington
authors: Rui
authors: R
authors: Wu
authors: Kwang-Ting
authors: KT
authors: Cheng
authors: John E
authors: JE
authors: Bowers