Structure Generator

The structure generator and mesher creates device structures and performs rectangular (2D) or cubic (3D) meshing or Finite-Element meshing.

Salient Features

Creates a 2D or 3D device composed of many (possibly intersecting) regions of shapes.
Perform shape operations and transformations.
Python interface enables scripting and integration.
Create doping profiles e.g. Gaussian, exponential, linear, or user-defined analytic profile.
Set refinements global, regions-wise, or in specific areas.
Can import GDS layout file to create shapes, doping masks.

Built-in Shapes and Transformations

Built in shapes are - axis-aligned rectangle or cuboid,
2D Polygon or 3D polyhedron from vertices,
and special shapes -- ellipse, ellipsoid, cylinder, cone, pyramid, prism, wedge, convex-hull.
Boolean operations -- add, clip, subtract shapes.
Shape Transforms -- translate, rotate, scale, mirror shapes.
Shape rounding, chamfering, offsetting, stretching.
2D Shape sweep to create prisms, pyramids, pipes, revolutions.

Python Interface

Python-interface enables scripting and parametrization of the structure generation task

As an illustration, Python commands for creating and editing various shapes are-

import mesher as m 
win1 = tm.refwin("RefCyl1","Polygon",poly,{},{})
win1.offsetRefWin(2)
win1.makePyramid2DRefWin(...)
win1.revolve2DRefWin(...,230)

For detailed description, please refer to the user-guide and the examples therein.

Structure Generator GUI

Structure generator provides a user-friendly GUI for drawing RefWins,
Shape editing and transformations.
GDS layout import and structure gen
Setting Region, MeshDef, DopingDef, and ContactDef
Mesh generation and viewing

Mesher support

The mesher tool creates mesh using the user-defined mesh refinements. Following mesh are supported.
FEM-mesh: Quad-tree (2D) or oct-tree (3D) based.
FEM Mesh
Tensor-mesh: A rectangular (2D) or cubic (3D) mesh.
Tensor Mesh
Triangle mesh: Uses external 2D FEM mesh generator.
Tri Mesh
TetGen mesh: Uses external 3D FEM mesh generator.

Structure from GDS Layouts

GDS Layout import can generate regions by sweeping masks vertically,
It can also generate doping distribution using GDS mask.
GDS file of Silicon wave-guide
Silicon wave-guide structure