Lumerical FDTD — Monitors

Introduction and Common Settings for Monitors in Ansys Lumerical FDTD — Lesson 1

Index Monitor in Ansys Lumerical FDTD — Lesson 2

Time Monitors in Ansys Lumerical FDTD — Lesson 3

Movie Monitor in Ansys Lumerical FDTD — Lesson 4

Frequency-Domain Field Monitor in Ansys Lumerical FDTD — Lesson 5

Mode Expansion Monitor in Ansys Lumerical FDTD — Lesson 6

Ports in Ansys Lumerical FDTD — Lesson 7

Summary of Monitors in Ansys Lumerical FDTD — Lesson 8

Quiz — Lumerical FDTD — Monitors

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Quiz — Lumerical FDTD — Monitors

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Quiz — Lumerical FDTD — Monitors

Lumerical FDTD — Monitors Quiz — Lumerical FDTD — Monitors Quiz — Lumerical FDTD — Monitors

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Question 1 of 19

1. Question
In which of the following cases would you want to use an index monitor? (select all that apply)
- making sure the mesh order of overlapping objects is correct
- view the electric field amplitude as a function of time
- check the refractive index variation over space
- check the imaginary part of the refractive index of the structure
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Question 2 of 19

2. Question
Which of the following are applications where the time monitor is suitable?
- Measuring the power transmitted through a waveguide
- Measuring the effective index of a waveguide
- Determining the resonant frequencies of a cavity resonator
- Extracting the bandstructure of a photonic crystal lattice
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Question 3 of 19

3. Question
Play the following video showing the E-field intensity generated from a movie monitor with a diverging simulation. Note that the divergence starts in the second half of the video so you can skip forward without viewing the full video.

Select the statements that are true below:
- The movie shows that the divergence likely originates from the PML boundaries
- The movie shows the response due to a continuously injected source
- The movie shows the fields over time
- The movie shows the outlines of the structures in the simulation region
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Question 4 of 19

4. Question
Which of the following plots show results that can be obtained directly from a frequency domain power or profile monitor without post-processing?
- Transmission spectrum
- Scattering cross section
- Poynting vector
- Refractive index
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Question 5 of 19

5. Question
Select the statements that are true.
- The mode expansion monitor must be used in conjunction with a mode source.
- The mode expansion monitor can return the fraction of power travelling in a single selected mode.
- The mode expansion monitor can return the fraction of power travelling in multiple selected modes.
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Question 6 of 19

6. Question
The S-paramaters for a device can be exported to a .dat file which can be loaded in INTERCONNECT after the simulations have been run. You can do this by right-clicking on the ___________ and selecting "Export to INTERCONNECT".
- Port object
- S-parameter sweep task
- Port group
Correct

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Question 7 of 19

7. Question
Which of the following material properties are measured by the index monitor?
- Refractive index
- Permeability
- Surface conductivity
- Susceptibility
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Question 8 of 19

8. Question
Which of the following monitors return data in the time domain?
- mode expansion
- power/profile
- movie
- time
- index
Correct

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Question 9 of 19

9. Question
Which of the following monitors would be most appropriate for determining the resonant frequency of a cavity?
- mode expansion
- power/profile
- movie
- time
- index
Correct

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Question 10 of 19

10. Question
Which of the following monitors would be most appropriate for obtaining the net power transmission through a surface?
- mode expansion
- power/profile
- movie
- time
- index
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Question 11 of 19

11. Question
A single-mode expansion monitor can be used to calculate expansion results for multiple frequency domain monitors.
- True
- False
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Question 12 of 19

12. Question
Which of the following could potentially be used to extract S-parameters for a device?
- A combination of the mode expansion monitor and power monitor
- A mode expansion monitor on its own
- 2 or more mode expansion monitors without other types of monitors
- Ports
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Question 13 of 19

13. Question
Download and run the associated script file to set up the simulation. This sets up a simulation with a coated particle made of several spheres on top of a silicon substrate. Symmetry is used in the simulation region boundaries to reduce memory requirements.

Verify structure using refractive index monitor

Add an index monitor over the cross-section of the spherical particle.

What is the structure of the particle?
- Central core with refractive index 1.5 followed by coatings with refractive index 2, 2.5, and 3.
- Central core with refractive index 1.5 followed by coatings with refractive index 2.5 and 3.
- Central core with refractive index 2 followed by coatings with refractive index 2.5 and 3.
- Particle with uniform refractive index 3.
- Central core with refractive index 2 followed by coatings with refractive index 2 and 2.5.
Correct

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Question 14 of 19

14. Question
Add a monitor above the source to measure the reflected power at 100 points over the frequency range of the source. Run the simulation and plot the reflection spectrum.

What is the maximum fraction of power at reflected?

Insert your answer as a number with three decimal places precision. For example, if the answer is 0.254912, type in 0.254.
Correct

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Question 15 of 19

15. Question
What wavelength does the maximum reflection occur at? Specify the answer in units of microns.

Insert your answer as a number with three decimal places precision. For example, if the answer is 0.254912, type in 0.254.
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Question 16 of 19

16. Question
Download and run the associated script file to set up the simulation. This is a 2D simulation where the source injects light from the narrow waveguide towards the wider waveguide. A frequency-domain power monitor is placed across the cross-section of the wider waveguide to measure the power transmitted through the device. A time monitor is placed behind the source and will measure the reflected fields over time.

Add a mode expansion monitor to find the fraction of transmitted power in the fundamental TM and first-order TM modes, ie. the two modes with the highest effective index with TM polarization (E fields are polarized in the z-direction). Run the simulation.

What is the fraction of transmitted power travelling forward in the fundamental TM mode?

Insert your answer as a number with three decimal places precision. For example, if the answer is 0.254912, type in 0.254.
Correct

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Question 17 of 19

17. Question
What is the fraction of transmitted power travelling forward in the first order TM mode?

Insert your answer as a number with three decimal places precision. For example, if the answer is 0.254912, type in 0.254.
Correct

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Question 18 of 19

18. Question
What is the total net power transmitted through the T monitor (transmission in all modes)?

Insert your answer as a number with three decimal places precision. For example, if the answer is 0.254912, type in 0.254.
Correct

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Question 19 of 19

19. Question
What is the maximum E field amplitude at any point in time measured by the time monitor?

Insert your answer as a number with four decimal places precision. For example, if the answer is 0.254912, type in 0.2549.
Correct

Incorrect