Transformation inverse design

• Main Authors: Liu, David (Contributor), Gabrielli, Lucas H. (Author), Lipson, Michal (Author), Johnson, Steven G. (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Mathematics (Contributor), Massachusetts Institute of Technology. Department of Physics (Contributor)
• Format: Article
• Language: English
• Published: Optical Society of America, 2013-09-06T13:15:47Z.
• Subjects: Article
• Online Access: Get fulltext

We present a new technique for the design of transformation-optics devices based on large-scale optimization to achieve the optimal effective isotropic dielectric materials within prescribed index bounds, which is computationally cheap because transformation optics circumvents the need to solve Maxwell's equations at each step. We apply this technique to the design of multimode waveguide bends (realized experimentally in a previous paper) and mode squeezers, in which all modes are transported equally without scattering. In addition to the optimization, a key point is the identification of the correct boundary conditions to ensure reflectionless coupling to untransformed regions while allowing maximum flexibility in the optimization. Many previous authors in transformation optics used a certain kind of quasiconformal map which overconstrained the problem by requiring that the entire boundary shape be specified a priori while at the same time underconstraining the problem by employing "slipping" boundary conditions that permit unwanted interface reflections.
United States. Air Force Office of Scientific Research. Multidisciplinary University Research Initiative (Complex and Robust On-chip Nanophotonics Grant FA9550-09-1-0704)