# Field Time Monitor

A Field Time Monitor is a field monitor that records selected electromagnetic field components in the time domain.

This object corresponds to tidy3d.FieldTimeMonitor (opens new window).

# Name

name: Unique name for the monitor.

  • Required field

# Geometry

Specification of the monitor region.

# Center + Size

Object definition through a center position and size.

center: Center of the monitor in x, y, and z-directions.

  • Type: floating-point number
  • Unit: m, mm (default unit), um

size: Size of the monitor in x, y, and z-directions.

  • Type: floating-point number
  • Unit: m, mm (default unit), um
  • Constraint: greater than or equal to 0
  • Required field

# Bounds

Object definition through minimum and maximum coordinate bounds.

min: Values of the x, y, and z coordinates defining the lower corner of the monitor.

max: Values of the x, y, and z coordinates defining the upper corner of the monitor.

  • Type: floating-point number
  • Unit: m, mm (default unit), um
  • Required field

NOTE

A 3D field time monitor can produce a large data storage size.

For 1D or 2D monitors, set the size of the corresponding dimensions to 0.

# Settings

# Fields

fields: Field components stored by the monitor.

  • Options: Ex/Ey/Ez/Hx/Hy/Hz
  • Default: all six field components

NOTE

Flux and Poynting vector data are included in the result when all necessary field components are selected.

# Advanced

colocate: Toggle whether fields are colocated to grid cell boundaries.

  • Options:
    • True: Colocate fields to grid cell boundaries.
    • False: Store fields at their native Yee grid positions.
  • Default: True

interval_space: Number of grid step intervals between monitor recordings in x, y, and z-directions.

  • Type: three positive integers
  • Default: (1, 1, 1)

start: Time at which to start monitor recording.

  • Type: non-negative float number
  • Unit: s, ms, us, ns (default unit), ps
  • Default: 0

stop: Time at which to stop monitor recording.

  • Type: float number
  • Unit: s, ms, us, ns (default unit), ps
  • Default: end of simulation

interval: Number of time steps between recorded samples.

  • Type: positive integer
  • Default: 1

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