HexPhCLayout

class picazzo3.phc.generic.cell.HexPhCLayout

Generic Layouting Cell for photonic crystals with hexagon holes on a Triangular lattice. The Layout of the cell is made up of a map, which is a multiline string representing the unit cells on a regular triangular lattice. The letters in the ‘map’ correspond to the diameters of the holes in the dictionary ‘hole_sizes’. The pitches can be defined as cartesian pitches using the property ‘pitches’, or using the property ‘lattice_pitches’ which specifies the lattice vector along the horizontal and the oblique axis, or using the property ‘pitch’, which just sets a uniform pitch along all lattice vectors.

Parameters:

name: String that contains only ISO/IEC 8859-1 (extended ASCII py3) or pure ASCII (py2) characters

The unique name of the pcell

See also

TriangularPhCLayout

DodecPhCLayout

Views

class Layout

Parameters:

purpose: PatternPurpose

Purpose of the layer on which the holes should be drawn.

process_wg: ProcessLayer

Process of the layer on which the holes should be drawn.

hole_sizes: dict

dictionary of the hole sizes of the Photonic Crystal. The value should be of the form {‘x’: 0.25, ‘y’: 0.26}. The keys of the dictionary should be characters and each character can be used to identify the unit cell in the map. If the property ‘cells’ is set manually, hole_sizes’ will be ignored.

pitch: float and Real, number and number >= 0

Lattice constant for a uniform triangular lattice. This property will be ignored if ‘lattice_pitches’ or ‘pitches’ are set manually

lattice_pitches: Coord2 and number >= 0

Lattice constants along the horizontal and the oblique direction. Choose identical values for a regular grid. If ‘pitches’ is manually set, this property will be ignored. If this property is set, the property ‘pitch’ will be ignored.

ports_coordinates:

list of tuple with (coordinate (in pitches), angle, waveguide_template, [name])

zero_line_y: float

line in the map which corresponds to the coordinate y=0. This can be a fractional number, and the unit is relative to pitches.y .

purpose_hfw: PatternPurpose

drawing purpose for underetching

process_hfw: ProcessLayer

process for underetching

map: str and String that contains only ISO/IEC 8859-1 (extended ASCII py3) or pure ASCII (py2) characters

Map of the photonic crystal. This property accepts a multi-line string. Every character in the string represents a unit cell of the photonic crystal, which can be found in the property cells

cells:

dictionary of Unit Cells for a Photonic Crystal. The value should be of the form {‘x’: cell1, ‘y’: cell2}. The keys of the dictionary should be characters and each character can be used to identify the unit cell in the map. The default value of this property is automatically calculated from the dictionary ‘hole_sizes’. Only assign to this property if you want to override this value. If you do this, the property ‘hole_sizes’ will be ignored.

pitches:

Cartesian (X, Y) pitches of the lattice. If this is specified, the properties ‘lattice_pitches’ and ‘pitch’ will be ignored

view_name: String that contains only alphanumeric characters from the ASCII set or contains _$. ASCII set is extended on PY3.

The name of the view

Examples

import si_fab.all as pdk  # noqa: F401
from ipkiss3 import all as i3

TECH = i3.TECH
from picazzo3.phc.generic import HexPhCLayout

my_phc_map = [
    "A A A A A A A A A A A",
    " B   A A A A A A   B",
    "A B   A A   A A   B A",
    " A B   A     A   B A",
    "A A B     B     B A A",
    " A A B   B B   B A A",
    "A A A B B A B B A A A",
    " A A A B A A B A A A",
    "A A A A A A A A A A A",
]  # a W-shaped cavity
cell = HexPhCLayout(name="my_hex_phc_layout1")
layout = cell.Layout(
    pitch=0.45,
    hole_sizes={"A": 0.290, "B": 0.190},  # two sizes
    map="\n".join(my_phc_map),
    zero_line_y=5,  # count lines from the top
    ports_coordinates=[
        ((-0.5, 0), 180, TECH.PCELLS.WG.DEFAULT),
        ((10.5, 0), 0, TECH.PCELLS.WG.DEFAULT),
    ],  # coordinates expressed in lattice pitches
)

layout.visualize(annotate=True)