# Physical objects 2D¶

Physical objects are the leafs of the geometry tree. They represent actual objects that have some shape and defined material.

<block2d/> (or <block/>)

Corresponding Python class: plask.geometry.Block2D.

Rectangular block. Its origin is located at the lower left corner.

Attributes: name – Object name for further reference. In the script section, the object is available by GEO table, which is indexed by names of geometry objects. axes – Specification of the axes. Most popular values are xy, yz, rz (letters are names of the horizontal and vertical axis, respectively). role – Object role. Important for some solvers. material – Definition of the block material (for solid blocks). material-bottom – Definition of the material of the bottom of the block (for blocks with material changing from bottom to top). You should also set material-top and both materials can differs only in composition or amount of dopant. material-top – Definition of the material of top of the block (see also material-bottom). material-shape – Exponent for graded materials. Setting this value to anything different than one allows non-linear change the block material. d{X} (required) – where {X} is the transverse axis name: Horizontal dimension of the rectangle. (float [µm]) d{Y} (required) – where {Y} is the vertical axis name: Vertical dimension of the rectangle. (float [µm]) width – Alias for d{X}. height – Alias for d{Y}. steps-num – Maximum number of the mesh steps in each direction the object is divided into if it is non-uniform. steps-dist – Minimum step size if the object is non-uniform.

Either material or both material-top and material-bottom are required.

<circle2d/> (or <circle/>)

Corresponding Python class: plask.geometry.Circle.

Circle with centre at point (0, 0).

Attributes: name – Object name for further reference. In the script section, the object is available by GEO table, which is indexed by names of geometry objects. axes – Specification of the axes. Most popular values are xy, yz, rz (letters are names of the horizontal and vertical axis, respectively). role – Object role. Important for some solvers. material-bottom – Definition of the material of the bottom of the circle (for circles with material changing from bottom to top). You should also set material-top and both materials can differs only in composition or amount of dopant. material-top – Definition of the material of top of the circle (see also material-bottom). material-shape – Exponent for graded materials. Setting this value to anything different than one allows non-linear change the circle material. radius (required) – Radius of the circle. (float [µm]) steps-num – Maximum number of the mesh steps in each direction the object is divided into if it is non-uniform. steps-dist – Minimum step size if the object is non-uniform.
<rectangle/>

Alias for <block2d/>.

<triangle/>

Corresponding Python class: plask.geometry.Triangle.

Triangle with one vertex at point (0, 0).

Attributes: name – Object name for further reference. In the script section, the object is available by GEO table, which is indexed by names of geometry objects. axes – Specification of the axes. Most popular values are xy, yz, rz (letters are names of the horizontal and vertical axis, respectively). role – Object role. Important for some solvers. material – Definition of the triangle material (for solid triangles). material-bottom – Definition of the material of the bottom of the triangle (for triangles with material changing from bottom to top). You should also set material-top and both materials can differs only in composition or amount of dopant. material-top – Definition of the material of top of the triangle (see also material-bottom). material-shape – Exponent for graded materials. Setting this value to anything different than one allows non-linear change the triangle material. a{X} (required) – where {X} is the transverse axis name: Coordinate of the first triangle vertex. (float [µm]) a{Y} (required) – where {Y} is the vertical axis name: Coordinate of the first triangle vertex. (float [µm]) b{X} (required) – where {X} is the transverse axis name: Coordinate of the second triangle vertex. (float [µm]) b{Y} (required) – where {Y} is the vertical axis name: Coordinate of the second triangle vertex. (float [µm]) steps-num – Maximum number of the mesh steps in each direction the object is divided into if it is non-uniform. steps-dist – Minimum step size if the object is non-uniform.