New topology optimal design approach for optical waveguide devices using a time domain beam propagation method (TD–BPM) is presented. A sensitivity analysis method for topology optimization using TD–BPM is formulated based on an adjoint variable method (AVM). A density method is used as a way to represent refractive index distribution. As design examples, a loss–reduced bending waveguide and a reflector are designed. It is confirmed that our design approach can surely enhance the performance of optical waveguide devices.
Topology optimal design for optical waveguides using time domain beam propagation method
IEICEEE_15_11_20180417
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