Which Types of Charge Boundary Conditions are Available?

Date	Category
2025-08-26 10:06:59	Charge

There are three boundary conditions available for Charge simulations:

1. Voltage boundary (VoltageBC), which sets a constant potential and is commonly used to model applied bias.

import tidy3d as td

voltage_source = td.DCVoltageSource(voltage=1)
voltage_bc = td.VoltageBC(source=voltage_source)

Note that the voltage argument can be an list or array, in which case all voltages will be simulated.

2. Current boundary (CurrentBC), which sets a constant current and is commonly used to model a fixed current source.

import tidy3d as td

current_source = td.DCCurrentSource(current=1)
current_bc = td.CurrentBC(source=current_source)

The current argument must be a float.

3. Insulating boundary (InsulatingBC), which models an insulating boundary that blocks charge flow.

import tidy3d as td
bc = td.InsulatingBC()

This boundary condition is typically used to simulate surfaces or interfaces that do not allow charge to pass through.