案例分享：通过布尔运算，将版图部分图层挖空
所有代码如下：
from si_fab import all as pdk
from ipkiss3 import all as i3
import numpy as np
class grating_coupler(i3.PCell):
_name_prefix = "grating_coupler"
r = i3.PositiveNumberProperty(doc="the radius of the first grating tooth")
sector_angle = i3.AngleProperty(doc="the sector angle")
grating_period = i3.PositiveNumberProperty(doc="the period of grating")
duty_cycle = i3.PositiveNumberProperty(doc="the duty cycle of grating")
period_number = i3.IntProperty(doc="number of grating periods")
def _default_r(self):
return 50.0
def _default_sector_angle(self):
return 20.0
def _default_grating_period(self):
return 4.0
def _default_duty_cycle(self):
return 0.5
def _default_period_number(self):
return 15
class Layout(i3.LayoutView):
def _generate_elements(self, elems):
elem2 = []
length_triangle = self.r + self.grating_period * self.period_number + 10
elem2 += i3.Wedge(
layer=i3.TECH.PPLAYER.SI,
begin_coord=(0.0, 0.0),
end_coord=(length_triangle, 0.0),
begin_width=0.0,
end_width=length_triangle * np.tan(np.radians(self.sector_angle / 2)) * 2,
)
for period in range(self.period_number):
elem2 += i3.ArcPath(
layer=i3.TECH.PPLAYER.SI_TRENCH,
center=(0.0, 0.0),
radius=self.r + period * self.grating_period,
start_angle=-self.sector_angle / 2 - 0.001,
end_angle=self.sector_angle / 2 + 0.001,
line_width=self.grating_period * self.duty_cycle,
)
layer1 = i3.TECH.PPLAYER.SI
layer2 = i3.TECH.PPLAYER.SI_TRENCH
generated1 = layer1 - layer2
mapping = {generated1: layer1}
elems +=elem2
# elems += i3.get_elements_for_generated_layers(elem2, mapping)
return elems
if __name__ == '__main__':
grating_coupler().Layout().visualize()
运行结果：
将代码55和56行改为：
# elems +=elem2
elems += i3.get_elements_for_generated_layers(elem2, mapping)
运行结果如下：
