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wafer process technology consulting
We help semiconductor companies, research labs, and startups unlock the full potential of their fabrication processes. With deep expertise in photolithography, etching, deposition, and process integration, our consulting services are designed to improve yield, reduce costs, and accelerate innovation.
From cleanroom workflow design and equipment selection to troubleshooting and technology transfer, we provide tailored guidance that meets your unique challenges. Our goal is to simplify the complexity of wafer fabrication, giving you the confidence to scale production and stay ahead in a rapidly evolving industry.
Partner with us to transform your ideas into reliable, scalable technologies — and gain a competitive edge in the global semiconductor market.
wafer fabrication
25FAB Foundry: Advanced Piezoelectric MEMS & Hybrid MEMS-PIC Integration Capabilities
At 25FAB, we deliver world-class open-foundry services for piezoelectric micromachined ultrasonic transducers (PMUTs) and hybrid MEMS-Photonics integration. Our proven processes enable cutting-edge devices from research prototypes to volume production.
Highlight: Dual-Frequency Piezoelectric PMUT for Fundamental & Harmonic Imaging
(Published in IEEE MEMS 2023 – Top Conference in the Field)
We successfully fabricated a single-element oval-diaphragm PMUT that simultaneously operates in two distinct frequency bands from one vibrating membrane — a breakthrough verified by real ultrasonic imaging experiments.
World-Class 2D Piezoelectric MEMS Micro-Mirrors & Full Turnkey Service
(From Prototype to Volume Production – We Design + We Fab)
25FAB has successfully developed and fabricated high-performance 2D piezoelectric MEMS micro-mirrors that rival and exceed current industry benchmarks. Our mirrors are already proven in real laser beam steering systems and deliver.
Applications We Serve
- Automotive AR-HUD (windshield & near-field projection)
- Smart/AR glasses & wearable light engines
- LiDAR & 3D sensing
- Pico-projectors, industrial laser marking, biomedical imaging
We do everything from your idea to delivered wafers:
concept → simulation → layout → MPW proof-of-concept → design freeze → dedicated volume runs.
25FAB – Your Single-Chip Solution for Piezoelectric-Tuned Photonics
Target Applications
- Tunable narrow-linewidth lasers & microwave photonic oscillators
- Reconfigurable photonic integrated circuits (ROADMs, optical switches)
- Ultra-linear phase modulators for coherent communication and RF photonics
- Chip-scale LiDAR beam steering with piezo + photonics
- Quantum photonics with fast piezo-tuned cavities
One Partner, One Process, 200 mm wafers, MPW shuttles, dedicated runs
You bring the idea – we deliver the fully integrated, piezo-electrically tuned photonic chip with world-class optical and actuation performance.
25FAB – World’s Smallest Silicon Photonic MEMS Switch Array
(Optics Express 2018 – Still the Global Size Record in 2025)
- Single switch cell: 125 × 125 μm – world’s smallest ever reported
- Full 8×8 non-blocking matrix: 64 switches in just 1 × 1 mm
- 100 % first-wafer yield across the entire lot
- 109 nm coupling gap precision via lateral comb-drive
- < 1 dB insertion loss │ > 16 dB crosstalk │ 36.7 μs switching │ > 1 billion cycles
All designed and fully fabricated in-house on a 250 nm SOI single-mask, two-etch process.
When the target is the absolute limit of integration density and yield, only one foundry has already done it on the very first wafer.
25FAB – We turn record-breaking nanophotonic MEMS into reality.
25FAB – Gallium Nitride Metasurface Foundry
World-Class GaN-on-Sapphire | GaN-on-Silicon | AlGaN/GaN Platforms
Turnkey Service
Custom metasurface design
→ DUV/E-beam lithography → GaN nano-fabrication → MPW shuttles → dedicated volume runs
When the world needs the highest-index, most precise, wafer-scale GaN metasurfaces, only one foundry has already shipped them at scale.