Calculators + Utilities

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This page lists a few online calculators and utilities that are useful to lab users.

Fabrication Processes & Converters

Material Parameters

Wet Etching

Refractive Indices

Optical constants of many common materials. Useful for laser etch monitoring, optical filter/mirror/anti-reflection coating design, photonic devices etc.

Scripts + Programs

Analysis Programs

  • FIJI - scientific image anaylsis software
  • Gwyddion - free analysis software for Atomic Force Microscopes (AFMs) and other 3D data.
    • Sophisticated leveling, slicing, roughness/particulate analysis functions etc.
    • Can open Bruker NanoScope files, from the AFM
  • (Filmetrics) - online analysis/storage/sharing of 3D topographical data and images.
    • You can share an interactive 3D render of your AFM or Profilm3D scans with this tool.
    • Example AFM Scan, taken with NanoFab equipment, shared online for interactive analysis (slice, flatten etc.).

CAD Layout Programs

Use these for designing your lithography mask plates.

  • L-Edit - Powerful multi-layer layout program. Sophisticated object instantiation and array layout, to reduce files sizes and easily push changes to multiple cells.
  • KLayout - A free, open-source, and fast/simple CAD tool for mask/reticle layout.
    • Available on Windows, Mac or *Nix.
    • Easily scriptable with Python or Ruby, with decent tutorials.
    • Fast and very effective viewing of layer overlay, overlay multiple files, cell hierarchy etc.
    • The only confusing part about KLayout is how to draw circles. You have to draw a square, and then apply the Edit>Selection>Round Corners function - this is because GDS files do not have a "circle" primitive built-in. Make sure you include enough polygon points, eg. 200.
    • ‘Before’ starting your design, set the Layout Properties > Database Unit to something small eg. 0.0001 µm (0.1nm)

General Calculators

  • Anaconda Python
    • A free Matlab-like IDE and GUI, using the Python language. The Spyder interface is modeled after Matlab.
    • Includes the scientific Python libraries needed for array math (numpy), plotting (matplotlib), data science (pandas) and many others. Many open-source packages are available to extend capabilities. The PyVisa module adds equipment control capabilities for automated measurements.
  • Wolfram Alpha
    • A versatile online interpreter/calculator, allowing calculations such as "Volume of 1.5g of Silicon", "melting point of SiO2" or "520°C in Fahrenheit".

Python Scripts

These scripts are best run in the Spyder IDE, which is easily installed via Anaconda, Python(X,Y), or by directly compiling Spyder using a command-line package manager.

  • Keithley I-V Sweep
    • Sweep voltage and plot current vs. voltage using a Keithley SMU.
    • Already installed at the Probe Station in Bay 4, and on the QFI Thermal Microscope (Use Python(X,Y) to run).
    • Requires the pyvisa python module.
  • QFIScope Thermal Analysis
    • Import 2D temperature data from the IR Thermal Microscope (QFI) and plot temperature profiles at user-specified locations.
    • Already installed on the QFI Infrared Microscope.
  • Laser Etch Monitor Simulation in Python
    • Simulate your laser endpoint signal as you dry-etch through a stack of thin-film layers, using an open-source electromagnetics module.
  • (Demis D. John)
    • Python functions for returning n (ref. idx.) & k (ext. coeff.) of various NanoFab thin-films at a specified wavelength (aka. dispersion models).