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From science to society

Microfabrication in cleanroom

Clean room microfabrication for your components, microsystems and precision devices.

Microfabrication in a clean room allows the realization of structures and components on the micrometric and nanometric scales, with a mastery of processes and materials inaccessible outside a controlled environment. It is the core technology of MEMS, microsystems, precision optical components and many biomedical devices.

FEMTO Engineering offers manufacturers an access to the processes and equipment of the MIMENTO clean room at the FEMTO-ST institute. MIMENTO is certified ISO 5 to 7 and ISO 9001, and is part of the national RENATECH network. The team supports projects from process definition to component delivery, ensuring the interface between industrial needs and the platform’s technological capacities.

For what needs?

Production of micrometric and nanometric components

You need structures at the micrometric and nanometric scale, on specific materials, with tolerances that conventional machining cannot reach. You do not have access to a clean room or the necessary microfabrication processes.

Development of a specific microfabrication process

You have an idea for a component or device but you do not know if the process is feasible with your materials, nor which parameters to use. You need an exploration and testing phase before committing.

Production of MEMS components and microsystems in small series

You validated a concept and you need to move to limited production for qualification, testing or marketing phases, without investing in your own clean room equipment.

Production of precision optical components

You work on difficult substrates—quartz, sapphire, LiNbO3, diamond—which require specific processes that are not available with conventional subcontractors.

Production of biomedical devices in clean rooms

Your project requires an ISO controlled environment to ensure the cleanliness and fabrication repeatability, but investing in your own clean room is not justified for your production volume.

Our services

Feasibility study and tests

Assessment of material/process compatibility, initial cleanroom tests, results report.

Development of specific processes

Development of custom processes on Si, glasses, quartz, sapphire, diamond, LN, LT. Optimization, documentation, and transfer.

On-demand technological services

Access to FEMTO Engineering equipment and expertise for occasional or recurring needs.

Production of very small and small series

Production in limited quantities for qualification, validation and market launch.

Packaging and connectivity

Precision cutting and polishing, wire bonding, wafer bonding, flip-chip microassembly.

Application examples

MEMS and microsystems

Microsensors, microactuators, resonators, gyroscopes, accelerometers. For manufacturers who develop embedded systems or measuring instruments requiring miniaturized and reliable components.

Precision optical components

Diffraction gratings, waveguides, ridge structures on LN, PPLN and PPLT components for nonlinear optics. For optical system manufacturers who need components on special substrates with off-catalogue specifications.

Biomedical devices

Biochips, lab-on-chips, microreactors for biological analysis, filtration membranes, microfluidic structures in biocompatible materials. For teams developing medical devices or biological analysis tools requiring controlled environment manufacturing.

Watchmaking & precision mechanics

Micro-gears, springs, precision parts in Si3N4 and other hard materials. For watch and fine mechanics manufacturers who need components with tight geometric tolerances and guaranteed mechanical properties.

Electronics and microwave frequency

Substrates for integrated circuits, packaging of precision electronic components, components for RF applications. For teams working on high frequency electronic systems requiring controlled deposition and etching processes.

A partner for your innovation projects

FEMTO Engineering offers manufacturers a concrete access to one of the best French microfabrication platforms, without having to invest in cleanroom equipment or hire specialists.

For a project requiring micrometric or nanoscale manufacturing processes, it is a direct shortcut to world-class research capabilities, with technical support based on the industrial need and adapted to time and budget constraints.

Our technical means

Platform
MIMENTO

MIcrofabrication for MEchanics, Nanosciences, Thermics, and Optics

UV and electronic photolithography

UV and LIGA lithography for the definition of micrometric-scale patterns. Standard and thick resins (KMPR 1050).

Deposits of thin and thick layers

RIE, DRIE on dielectric materials (glass, Si3N4, LN), FIB, KOH and BHF etching. Verticality of the flanks greater than 88°, roughness less than 5 nm.

Single-crystal composite wafers

Fabrication of 100% monocrystalline thin films from 1 to 300 μm of silicon, quartz, LN, LT, glass, sapphire on different types of substrates. Proprietary process ensuring the maintenance of physico-chemical properties.

Characterization

SEM, AFM, ellipsometry, reflectometry, profilometry, resistivity measurements by tester under HF and BF tips.

Manufacturing performance

Maximum aspect ratio of 400, flank roughness less than 5 nm, manufacture on substrates up to 4 inches.

The benefits of this technology

ISO controlled environment 5 to 7 ensuring cleanliness and reproducibility of processes

ISO 9001 certification for the traceability and quality of manufacturing

Member of the national RENATECH network, national reference in micromanufacturing

Processes that are compatible with a wide range of materials: Si, glasses, quartz, sapphire, diamond, LN, LT

Mastery of processes from lithography to packaging in a single location

A few realizations

Contact us

Jassem Safioui
PhD Optical Engineer Femtosecond Laser Micromachining
+33 (0)3 63 08 23 89
FEMTO Engineering
TEMIS Building 15B avenue des Montboucons – 25000 BESANÇON

Partners and associated ecosystem

Logo Bionoveo
Bionoveo
Logo Photonis
Photonis
Logo Syrlinks
Syrlinks
CEA-logo
CEA
renatech_logo_4
RENATECH
femto-logo
FEMTO-ST Institute
20260929_092054
October 10, 2026

From September 29 to October 2, 2026: Micronora 2026

AnnonceMicronora
August 29, 2026

From September 29 to October 2, 2026: we will be at Micronora

Do you have a project requiring microfabrication in a clean room?

Describe your materials, manufacturing constraints, and objectives. We will assess the feasibility and quickly answer your request.
4-step method

Our support method

1
Study & feasibility
Analyse, frame and validate your technical assumptions
2
Technological development
Design and experiment solutions adapted to your constraints.
3
Prototyping & pre-series
Transform the concept into a functional object ready to evolve.
4
Industrial transfer
Train your teams and integrate the processes for good.

Research-based engineering, geared towards industry

FEMTO Engineering supports the companies in the development of advanced technologies by relying on the scientific excellence of the FEMTO-ST institute. FEMTO Engineering has a dedicated team of engineers and specialized experts at the service of your innovation projects, who are immersed among the FEMTO-ST research teams.

Our role: to transform the academic research results into concrete industrial solutions.

Bourgogne-Franche-Comté_2016

Financial support from the Région Bourgogne-Franche-Comté

1577028368405

Carnot accreditation

Résultat-de-recherche-dimages-pour-CIR-officiel

Eligible for Research Tax Credit (CIR)

Contact the department Microfabrication in cleanroom