HMS Technology Sales
(415) 924-6300
harry@hmstechnologysales.com



      round pillars

            round pillars
    polarization insenstive


      rectangular pillars

      rectangular pillars
  for circular polarization


cross-type pillar

          cross-type pillar
x-arm length TM polarization
y-arm length TE polarization


      transmission vs pillar height at 650 nm

    heat map plot showing
    transmission vs pillar height
    calculated using RCWA
    Pillar height selected for
    good transmission across
    pillar radii


phase vs radius at 650 nm

    phase vs pillar radius
    calculated using RCWA
    Pillars from 0-to-2pi phase
    are selected and saved in
    a meta-atom library
    to use as building blocks
    for metasurface layout


GDS mask enlarged

  englarged GDS mask showing
  meta-atoms placed at positions
  in the metasurface to minimize
  target wavefront error


metasurface layout

    rectangular and cross-shape
    meta-atoms placed at each
    position on the surface
    according to the phase with
    the lowest target wavefront
    error


      metasurface layout

GDS mask showing metasurface
layout with weighted optimization
to split TE and TM polarization
PlanOpSim Metasurface Simulation and Design

Easiest metasurface design software
    PlanOpSim software was developed specifically for metasurface
        simulation and design.
    The graphical user interface is intuitive, making it easy to learn and use.
    Easy to import near-field and far-field targets, change settings,
        reanalyze designs, optimize designs by running parameter sweeps
        with multiple variables, layout metasurfaces and export GDSII
        fabrication files.
    The workflow is logical and easier than script-based software.
    Contact us to request a detailed workflow comparison

Features of PlanOpSim MetaCell
    Create subwavelength pillars and meta-atom pillar groups.
    Metasurface pillar shapes:
        round - polarization insensitive
        rectangular - polarization sensitive by rotation
        cross - more polarization control by rotation and x, y dimensions
    Full wave Maxwell solver to calculate the phase of individual meta-atoms
        and diffraction efficiency of periodic structures
    Rigorous Coupled Wave Analysis (RCWA)
    Plot heat map showing transmission (in red) vs pillar height
        and radius
        Choose pillar height for transmission across range of pillar sizes
        and for practical fabrication size
    Plot phase vs pillar radius to select pillars from 0-to-2pi phase
        to include in a meta-atom pillar group
    Store meta-atom pillar groups in a library for convenient metasurface
        layout, as described in the next section on the MetaComponent
        program
    The library can contain meta-atom pillar groups with different pillar
        shapes for designing complex, multifunction wavefront targets
        and for dispersion engineering.
    Contact us to request RCWA vs FDTD speed and accuracy comparison

Features of PlanOpSim MetaCell + MetaComponent
    The MetaComponent program is for importing near-field and far-field
    targets, conveniently laying out metasurface structures,
    exporting GDSII fabrication files and exporting metasurface
    designs to Zemax.

    Near-field design - two ways:
        Input Zemax wavefront surface response (binary2 surface)
        Input near-field phase as an analytical expression, in a
            Python script to create a customized wavefront

    Far-field design - and IFTA
        For far-field design a target pattern can be imported, such as a JSON
            image file.
        Iterative Fourier Transform Algorithm (IFTA) is used to create
            metasurface phase designs from a far-field pattern.
            IFTA starts by creating a random phase distribution
            in the near-field, based on far-field amplitude input.
            The projected pattern is evaluated against the target, and each
            iteration improves the phase design until a desired pattern
            is developed.
            It takes PlanOpSim just seconds to develop, evaluate and improve
            mutiple metasurface phase designs.

    Parameter sweep
        The Parameter Sweep in PlanOpSim is used to optimize designs for
        best performance, based on design criteria, and for fabrication
        tolerance analysis.
            Minimum and maximum ranges for each parameter can be
            specified, as well as the number of steps to vary in each range.
            Parameters can be varied linearly or randomly.
            The Parameter Sweep also makes it easy to see how performance
            changes when varying such parameters as wavelength
            and angle of incidence.
            Results, including spot size, spot location and wavefront can be
            shown quickly, and they can be viewed dynamically using a
            separate slider bar for each variable.

    Export GDSII fabrication files
        The finished metasurface design is used to export a GDSII
            fabrication file.
        Shown on the left are three examples of GDSII masks.
            round polarization-insensitive pillars
            both rectangular and cross pillars
            weighted optimization to split TE and TM polarization
                and focal spot locations
        Click on each image to enlarge it.

    Zemax Import
        Importing Zemax binary 2 files into PlanOpSim for metalstructure
            applications extends Zemax ray tracing to fully vectorial physical
            optics modeling and physical structure designs.

Types of User Licenses
PlanOpSim software is available for online operation or with a dongle for
    local operation.
User licenses can either be permanent or annually renewable
    subscriptions.
Subscription user licenses can reduce initial cost, offer longer, more
    thorough software evaluations or provide practical solutions
    for short-term projects.
Subscription user licenses can be converted to permanent licenses

To contact HMS Technology Sales for more information click here