Ayda Lotfi Hayaei

Projects

Computational Photonics Projects

Selected computational work focused on reproducible numerical modeling, integrated photonic devices, and physics-based design workflows.

View Selected ProjectGitHub Repository
Technical schematic of the selected symmetric SOI add-drop microring; R 10 micrometers, physical ring-bus gap 200 nanometers; not to scale
R = 10 µmgap = 200 nmMODE / varFDTD
Selected designR = 10 µmSOI microring
Ring–bus gap200 nmValidated design point
Median FSR8.00455 nmFinal spectrum
Median loaded Q2215.37varFDTD estimate

Selected Project

A convergence-validated computational integrated-photonics workflow progressing from an SOI strip-waveguide model through dispersion analysis, bend-radius characterization, coupling-gap pre-screening, and full add-drop microring simulation.

Computational Integrated Photonics

Reproducible SOI Add-Drop Microring Resonator

The project uses Ansys Lumerical MODE / varFDTD with Python automation through lumapi to build and validate a reproducible SOI microring-resonator simulation workflow.

Technical schematic of the selected SOI add-drop microring; not to scale
SOI MODE / varFDTD Python lumapi
View project details View GitHub repository

Final Design Point

Selected numerical results

Ring radius
10 µm
Ring–bus gap
200 nm
Median FSR
8.00455 nm
Median loaded Q
2215.37
Median extinction
11.79 dB
Spectrum samples
4001
Final net-flux-normalized SOI add-drop microring spectrum from the public repository
Final net-flux-normalized spectrum
Final numerical convergence comparison from the public repository
Final convergence comparison

Workflow

Reproducible simulation progression

  1. Effective index versus wavelength from the public project repository
    01

    SOI strip-waveguide baseline

    Establish the fundamental waveguide model and characterize the guided mode.

  2. Group index versus wavelength from the public project repository
    02

    Convergence and dispersion

    Evaluate domain and mesh convergence, effective index, group index, and wavelength-dependent behavior.

  3. Bent-waveguide effective index versus bend radius from the public project repository
    03

    Bend and coupling characterization

    Characterize bend radius and use straight-coupler supermode analysis as a gap pre-screen.

  4. Technical schematic of the complete add-drop microring; not to scale
    04

    Full add-drop microring model

    Simulate the complete symmetric add-drop resonator using varFDTD at the selected design point.

  5. Final convergence comparison from the public project repository
    05

    Validation and refinement

    Check time-decay behavior, net-flux normalization, mesh refinement, and spectral refinement.

  6. Final net-flux-normalized spectrum from the public project repository
    06

    Resonance metrics

    Extract FSR, loaded Q, extinction ratio, and the final resonance dataset.

Scope

What this project demonstrates

This project demonstrates a reproducible computational workflow for integrated-photonic device modeling and numerical validation using MODE / varFDTD and Python automation.

The current release does not claim full 3D-FDTD validation, fabrication, or experimental verification. The selected 200 nm coupling gap is a validated design point within the reported model, not a claim of global optimality.