Abstract
A topology optimization method can be used to find out the optical waveguide
structures which have the desired transmission characteristics. Using the
function expansion method, we can avoid the problem of a gray area, which
means that some areas having intermediate refractive index between those of
usable materials appear in a design region. However, so far, topology optimization
has mainly been studied for structures consisting of two isotropic materials.
In this paper, we study the applicability of topology optimization to structures
which include three or more materials, and demonstrate the optimal design
of a waveguide crossing.
© 2012 IEEE
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