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Niederberger, Armand C R; Fattal, David A; Gauger, Nicolas R; Fan, Shanhui; Beausoleil, Raymond G
Optics express, 06/2014, Letnik: 22, Številka: 11Journal Article
Numerical optimization of photonic devices is often limited by a large design space the finite-differences gradient method requires as many electric field computations as there are design parameters. Adjoint-based optimization can deliver the same gradients with only two electric field computations. Here, we derive the relevant adjoint formalism and illustrate its application for a waveguide slab, and for the design of optical sub-wavelength gratings.
