Polymer-cladded athermal high-index-contrast waveguides


Polymer-cladded athermal high-index-contrast waveguides




b -5.0





0 0.5 1 1.5 2 2.5

TOcore, !c (X104 K1)

Figure 6. Athermal conditions for channel waveguides with a large dncore

(materials such as Si or poly-Si. The confinement


factors (Γ’s) are simulated at room temperature, and depend on the waveguide geometry and the intrinsic index ratio


The above equation suggests that the athermal condition depends on the cladding/core’s material TO coefficients,

the confinement factor, and the product of the two properties. This equation provides the basic

guidelines for choosing the appropriate core/cladding material in designing an athermal channel waveguide in

general including SOI waveguides, SiN waveguides, and even silica waveguides.


We have presented general design criteria for athermal HIC channel waveguides using polymer cladding materials

with negative thermo-optic coefficients. The temperature dependence on the waveguide effective index depends

on 2 variables: materials TO coefficients and mode confinement factor (determined by waveguide geometry and

index contrast). We studied the feasibility of two polymers (DuPont’s A2 and P2) for achieving an athermal

waveguide design.


The authors would like to acknowledge the Canadian National Sciences and Engineering Research Council

Postdoctoral Fellowship (NSERC-PDF) for funding and DuPont Photonics Technologies for technical support.


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Proc. of SPIE Vol. 6897 68970S-7

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