RCV

Rahul Chembra
Vasudevan

Researcher in diamond integrated photonic platforms, building scalable nanofabrication and packaging workflows for industrial quantum sensors.

cvrahul40@gmail.com LinkedIn Rennes, France

Selected Highlights

Diamond pillars — Deep ICP-RIE etch of Single Crystal Diamonds· upto 30 µm · 4 nm sidewall roughness (AFM)

SEM etching — Diamond pillars · 200 nm · NV membrane . Neuronal imaging

Bonded membrane — Room-temp bonding · diamond on silica

Optical setup — Industrial Fiber endscope· Micromanaipulation and pacakaging · For NDT solutions

Packaged device — Diamond chip for electrometry

About

I work on scalable fabrication of diamond integrated photonic platforms for industrial quantum sensing.

With major expertise in designing cleanroom fabrication workflows (lithography, thin film depositions, plasma etching), membrane bonding and packaging, and building custom optical characterization setups for integrated photonic devices for quantum sensing.

Apart from research, I enjoy creating and showcasing various artworks, ranging from digital illustration (Blender, Inkscape) to acrylic paintings and pencil drawings, with several exhibitions conducted. I love to transfer my creative side into my scientific communications as well.

Currently open to photonics R&D and process engineering roles where cleanroom skills and optical characterization are valued for industrial research and manufacturing.

Education

PhD, Photonics

Institut Foton · INSA Rennes · University of Rennes, France

Photonic integration of diamond materials for NV ensemble based quantum sensing

2024 – Present

M2 Photonics, Optical Communication — Exchange Student

ENSSAT, University of Rennes, France

2022 – 2023

Integrated M.Sc., Photonics

Cochin University of Science and Technology, India

2018 – 2023

Research Experience

PhD — Diamond Integrated Photonics

2024 – Present

Institut Foton, INSA Rennes, France

Established the lab's first diamond nanoprocessing and packaging workflows, together with device characterisation setups. Key results: fabricated high-aspect-ratio pillars down to 200 nm diameter for neuronal electrometry; achieved deep etching of single-crystal diamond up to 30 µm with 3 nm sidewall roughness; developed a room-temperature bonding process for diamond membranes for integrated photonics; and integrated micrometre-scale diamond membranes with optical fibers for an industrial prototype of non-destructive-testing endoscope.

Master Thesis — Quantum Optics

2022 – 2023

Institut Foton, University of Rennes, France

Built NV magnetometry setups and developed a quantum optics practical course based on entangled photon pair generation via SPDC in BBO crystals. The course included demonstrations of Bell's inequality violation, Hong–Ou–Mandel interferometry, and second-order correlation measurements.

Mitacs Globalink Fellow

May – Jul 2022

TRIUMF Particle accelerator center, Vancouver, Canada

Simulated multi-step laser ionization of Rb and Na using density-matrix simulations, validated against photoionization data from the ISAC (Isotope Separator and Accelerator) beamline.

Industrial Project Student

Jun – Aug 2021

IIT Kanpur, India

Trained ML models for diabetes detection (classical pipeline) and human iris classification (CNN).

Publication

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 ↗

Skills

Cleanroom Skills

Photolithography E-beam Lithography ICP-RIE RIE PECVD Sputtering E-beam Evaporation

Fabrication & Packaging

Diamond Membrane Bonding Fiber Endoscope Packaging Wire Bonding

Characterisation

NV-Center Magnetometry Quantum-grade diamond characterization AFM SEM Ellipsometry Raman Spectroscopy Photonic Integrated Circuit Characterisation

Simulation & Design

COMSOL KLayout MATLAB Python Inkscape Blender

Beyond the Lab

A few things I love doing outside research and here are some of the moments I've captured.

Cooking (Choclate Brownie with Blueberries)

Photography (Aurores boréales at Lannion, Bretagne)

For more, on Instagram @rahul__cv

Contact

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

cvrahul40@gmail.com · Download CV