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Birefringence control in optical planar waveguides

机译:光学平面波导中的双折射控制

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摘要

Planar optical waveguides consisting of layers from different materials created at elevated temperatures usually exhibit substantial stresses. These stresses are caused by thermal-induced strains that originate from the bonding of the layers in addition to intrinsic strains. For the first time, the analytical form of thermal stress formula is derived for the waveguide glass layer of the silicon-based silica waveguide in bilayer structures by the thin-film approximation and under the strain compatibility and the force equilibrium conditions. These conditions address the composite nature of the waveguide glass layer containing the waveguide core layer and the cladding layers within the optical planar waveguide. The developed formula reveals that temperature parameter, material parameters, and structural parameters affect the distribution of the thermal stress. By applying the formula, we demonstrate that it is possible to achieve the thermal stress-free, and, hence, the stress-induced birefringence-free waveguide devices by proper waveguide designs.
机译:由在高温下产生的不同材料制成的层组成的平面光波导通常会表现出很大的应力。这些应力是由热诱发的应变引起的,这些应变除了固有应变外,还源自各层的结合。首次通过薄膜近似,在应变相容性和力平衡条件下,得出了双层结构硅基二氧化硅波导的波导玻璃层的热应力公式的解析形式。这些条件解决了在光学平面波导内包含波导芯层和包层的波导玻璃层的复合性质。公式表明温度参数,材料参数和结构参数会影响热应力的分布。通过应用该公式,我们证明可以通过适当的波导设计来实现无热应力的,因此无应力诱导的双折射的波导器件。

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