Rahul Chembra Vasudevan

Rahul Chembra
Vasudevan

PhD researcher building single-crystal diamond devices — from cleanroom fabrication to packaged quantum sensors.

cvrahul40@gmail.com LinkedIn GitHub Rennes, France

Selected Work

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Diamond pillars
Diamond pillars · 200 nm · NV membrane
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SEM etching
Deep ICP-RIE etch · 30 µm · 4 nm roughness
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Bonded membrane
Room-temp bonding · diamond on silica
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Optical setup
NV spin-readout setup · built from scratch
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Packaged device
Fiber-packaged diamond chip

About

I am a PhD researcher at Institut Foton (INSA Rennes) building diamond integrated photonic platforms from the ground up — the first of their kind at the institute.

My work spans the full stack: cleanroom fabrication (lithography, deposition, plasma etching), membrane bonding and packaging, and optical characterization (PL, ODMR, Rabi, Ramsey).

Currently open to photonics R&D and process engineering roles where cleanroom skills and optical characterization meet industrial device manufacturing.

Education

PhD, Photonics
INSA Rennes · University of Rennes, France
Diamond integrated photonics & NV ensemble quantum sensing
2024 – Present
M2 Photonics, Optical Communication — Exchange Student
University of Rennes, France
2022 – 2023
Integrated M.Sc., Photonics
Cochin University of Science and Technology, India · University of Rennes, France
2018 – 2023

Path

PhD — Diamond Integrated Photonics

2024 – Present
Institut Foton, INSA Rennes, France
Established the lab's diamond nanofabrication pipeline. Fabricated high-aspect-ratio pillars, achieved 4 nm sidewall roughness in 30 µm deep ICP-RIE etching, and developed a room-temperature bonding process for diamond membranes.

Master Thesis — Quantum Optics

2022 – 2023
Institut Foton, University of Rennes, France
Built NV magnetometry setups and demonstrated Bell inequality violation, Hong-Ou-Mandel interference, and second-order correlation measurements.

Mitacs Globalink Fellow

May – Jul 2022
TRIUMF, Vancouver, Canada
Simulated multi-step laser ionization for Rb and Na, validating against ISAC beamline photoionization data.

Industrial Project Student

Jun – Aug 2021
IIT Kanpur, India
Trained ML models for diabetes detection (classical pipeline) and iris classification (CNN).

Research Intern

Jun – Jul 2021
SSERD, Bengaluru, India
Studied the role of magnetic fields in star formation via theoretical modeling and MHD simulations.

Output

Diamond and Related Materials · Vol. 168 · 2026 · Article 113992
Scalable fabrication of diamond-on-silica heterostructures via high-selectivity deep ICP-RIE and room-temperature bonding
R. Chembra Vasudevan, A. Hammouti, J. Le Pouliquen, T. Batte, P. Pirasteh, Y. Dumeige, P. Huillery
View on ScienceDirect ↗

Labs & Collaborations

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Institut Foton
INSA Rennes · France
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TRIUMF
Vancouver · Canada
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IIT Kanpur
India
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SSERD
Bengaluru · India
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CUSAT
Cochin · India
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University of Rennes
France

Toolkit

Photolithography E-beam Lithography ICP-RIE RIE PECVD Sputtering E-beam Evaporation Diamond Bonding Fiber Packaging Wire Bonding PL / ODMR / Rabi AFM / SEM / Raman COMSOL KLayout Python MATLAB

Beyond the Lab

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Art
Art
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Cooking
Cooking
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Hiking
Hiking
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Web design
Web designing
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Football
Football

Contact

Open to photonics R&D, process engineering, and quantum sensing roles.

cvrahul40@gmail.com · Download CV