Integrated Photonics · Silicon Nitride PICs

Prachi Agrawal

Photonics Design Engineer · Doctoral Researcher in Integrated Photonics

I design, simulate, and experimentally validate fabrication-tolerant silicon-nitride photonic integrated circuits for visible-wavelength applications — from directional couplers and MMI splitters to grating emitters and optical phased arrays.

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Prachi Agrawal

About

A photonics engineer who spans design and the lab bench.

I am a Doctoral Researcher in Integrated Photonics at RWTH Aachen University, where I work on silicon-nitride photonic integrated circuits (PICs) for visible wavelengths. My work runs the full development cycle — from device design and rigorous simulation to mask layout, fabrication-tolerant optimization, and hands-on experimental characterization.

My core devices include 2×3 directional couplers, 1×2 MMI splitters, compact grating emitters, and thermo-optic phase shifters, built with Lumerical MODE/FDTD/EME workflows and validated through edge- and fiber-coupling experiments, cut-back loss extraction, and far-field measurement. I automate design sweeps and measurement pipelines in Python and LabVIEW.

I am completing my PhD in January 2026 and looking for an industry R&D role as a Photonics Design Engineer, while remaining open to research collaboration. If you're building the next generation of photonic systems, I'd love to talk.

Research & Expertise

Core competencies

End-to-end capability across photonic device design, simulation, layout, and experimental characterization.

PIC Design & Simulation

Silicon Nitride (SiN) PICs Directional couplers (2×3) MMI splitters (1×2) Grating & edge couplers Optical phased-array emitters Thermo-optic phase shifters Lumerical MODE / FDTD / EME

Fabrication & Characterization

Fabrication-tolerant optimization DFT-compliant layouts OptoDesigner mask generation Fiber-array / edge coupling Cut-back loss measurements Laser microscopy for defect analysis

Selected Work

Featured projects

A few representative devices and results. Drop your own simulation plots, far-field images, or micrographs into each figure.

[ figure → assets/proj-coupler.png ]2×3 directional coupler

2×3 Directional Coupler

Mid-tap power extraction with near-zero crosstalk, designed for crossbar optical phased arrays.

[ figure → assets/proj-mmi.png ]1×2 MMI splitter

1×2 MMI Splitter

Optimized for low imbalance and robust fabrication tolerance across process variation.

[ figure → assets/proj-grating.png ]Compact grating emitter

Compact Grating Emitter

Gaussian far-field profile that improves the fill factor of optical phased-array apertures.

[ figure → assets/proj-opa.png ]Optical phased array

Optical Phased Array — 2D Beam Steering

Two-dimensional beam steering based on nonlinear beam mixing.

Optics Letters, 2022 →

Experience

Professional experience

Doctoral Researcher — Integrated Photonics

Sep 2021 – Jan 2026

RWTH Aachen University, Germany

  • Designed 2×3 directional couplers with mid-tap power extraction and near-zero crosstalk.
  • Designed and validated 1×2 MMI splitters optimized for low imbalance and fabrication tolerance.
  • Developed compact grating emitters with Gaussian far-fields, improving OPA fill factor.
  • Built MODE/FDTD/EME workflows for modal, coupling, and tolerance analysis.
  • Automated fabrication sweeps and far-field evaluation using Python and LabVIEW.
  • Performed edge and fiber coupling experiments, loss extraction, and phase-shift calibration.

Publications

Selected publications

Full list on ResearchGate.

Agrawal P., Ashtiani F., Merget F., Aflatouni F., Witzens J.

Optical phased array with 2D beam steering based on nonlinear beam mixing.

Optics Letters, 47(16), 3996–3999, 2022. DOI: 10.1364/OL.463710

Agrawal P., Tabatabaei Mashayekh A., Hossein P., Gilbert B., Merget F., Witzens J.

2×3 waveguide coupler and compact grating emitter for crossbar phased arrays.

Manuscript under publication process.

Hossein P., Tabatabaei M. A., Agrawal P., et al.

Focusing optical phased array for tissue interrogation with improved side-lobe suppression.

Biomedical Optics Express, 17(1), 12–37, 2025.

Hossein P., Agrawal P., Tabatabaei M. A., et al.

Focusing optical phased array for optically enabled probing of the retina.

ECIO 2024 Proceedings, Aachen, Germany.

Education

Academic background

PhD — Integrated Photonics (SiN PICs)

RWTH Aachen University
Optical Telecommunication I (OTK-I): Grade 1.0
Sep 2021 – Jan 2026

M.Tech — Optoelectronics & Optical Communication

Indian Institute of Technology (IIT) Delhi — GPA: 9.0/10
Master's thesis at TU Braunschweig, Germany — THz Photonics Group (DAAD-KOSPIE Scholarship), Sep 2020 – Mar 2021
Jul 2019 – Aug 2021

B.Tech — Electrical & Electronics Engineering

Birla Institute of Technology (BIT), Mesra
Aug 2014 – Jul 2018

Toolbox

Skills & tools

Simulation
Lumerical MODEFDTDEMECOMSOL
Layout
OptoDesigner
Programming
PythonMATLABLabVIEW
Version Control
Git
Languages
EnglishHindi

Affiliations & Profiles

Where I've worked & published

Contact

Let's build with light.

Open to industry R&D roles as a Photonics Design Engineer and to research collaboration. The fastest way to reach me is email.