Sandia Lab News

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New software from Sandia lets users design sciencefiction-
like materials with the same efficiency that
architects use when they draft building plans.
Sandia has created the first inverse-design software for
optical metamaterials. That means users start by describing
the result they want, and the software fills in the
steps needed to get there. The modern design approach
takes guesswork out of engineering as-yet theoretical
technologies, such as ultracompact, high-performance
cameras and cloaking armor that could make wearers
invisible to detection.

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Intelligent Symmetry Engine:

  • Mapping of symmetry to constitutive tensor and optical properties
  • Expert , Guided and Templated build modules
  • Library of meta-atoms and unit cells
  • State of the art CAD with all geometrical primitives and Boolean operations to achieve arbitrary meta-atoms designs
  • User based material assignment to segments of atoms
  • Automatic physical meshing based on material refractive index
  • Pick-and-place arbitrary 3D heterogeneous-unit cell tiling & stitching
  • Arbitrary layered super- and substrates
  • Periodic table of meta-atoms, unit cells, and molecules
  • Supports all space filling tiles in 2D, 2.5D and 3D systems
  • Algebraic expressions for dimensional dependencies

Smart Efficient Multiscale Electromagnetic Simulation Engine:

  • V&V on literature from Microwave-to-optical domains
  • Ability to extract and track diffraction orders
  • Automatic phase unfolding
  • Data processing and extraction of physical properties including: S-parameters, phase, volumetric fields distribution power, pointing vector, field intensity, surface charge density, quiver plots.
  • Exportation of tabulated CVS data and gif temporal time propagation
  • Handling of perturbative nonlinearity
  • User friendly scripting interface for exotic anisotropic material properties including: anisotropic and, dispersive media, gyrotropic media, ferrites with bias fields, graphine, and nonlinear susceptibility
  • Analytic determination of SALC resonant modes pre-simulation
  • Symmetry-based meta-atom periodic table for the design of meta-surfaces and lenses
  • Adjoint based source inversion and masking
  • 1mm2 metalens simulation

Guided flexible Optimization Engine:

  • Incorporation of DAKOTA geometric optimization package
  • Engagement of optimization method via simple mouse clicks in an optimization GUI
  • Canned objective functions and exemplar scripts for user guidance
  • Exposing of all compute quantities including spatial fields vectors and s-parameters to user for defining custom objective functions
  • Automatic propagation of assigned dynamic variables to optimization module
  • Run-time history showing geometric evolution of structure at various stages
  • User ability to upload measured data and use optimization module forensic tool to deduce structural dimensions
  • Incorporation of sensitivity analysis and uncertainty quantification for yielding robust solutions
  • Single and multi-objective optimization with user defined weights
  • Generation and exportation of optimization Pareto-Fronts
  • Incorporation of adjoint formulation and the enabling of exotic inversions including:
  • Source inversion
  • Source masking via active control
  • Target inversion
  • Tensor inversion (numerical homogenization)

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