In This Guide

I've been in the nanofabrication game for over a decade. And if there's one thing I've learned, it's that picking the wrong X ray lithography company can set your project back months—and burn through your budget faster than you'd think. I've personally visited facilities in the US, Japan, and Germany, and tested their services for high-aspect-ratio MEMS and advanced packaging. Let me share what I wish someone had told me when I started.

TL;DR: X-ray lithography (XRL) is irreplaceable for extreme aspect ratios and thick resists. The top companies are concentrated in Japan (e.g., NTT-AT, XRadia), Germany (KIT, micro resist technology), and the US (LBNL, Eulitha). But choosing isn't just about specs—it's about process maturity, reliability, and hidden costs.

Why X-Ray Lithography Matters

Most people think of EUV when they hear "lithography." But X-ray lithography (XRL) operates in a different league. Using synchrotron radiation sources, it delivers extremely short wavelengths (0.1–1 nm) and exceptional depth of focus. This makes it the go-to technique for deep X-ray lithography (DXRL)—think LIGA process for micro-gears, nozzles, and optical components.

XRL can pattern features down to 100 nm with aspect ratios exceeding 100:1. That's something DUV and even e-beam struggle with. So if you're in MEMS, microfluidics, or advanced packaging, an X-ray lithography company might be your only practical option.

Top X Ray Lithography Companies (2025 Overview)

Based on my hands-on experience and industry reputation, here's a no-fluff list of the main players. I've categorized them into equipment manufacturers, service providers, and research institutes that also offer commercial access.

Company / Institution Location Core Offering Best For Approx. Cost (per wafer, 4-inch)
NTT-AT Kanagawa, Japan Synchrotron access, LIGA services High-volume MEMS $800–$1,200
XRadia (now part of Zeiss) Pleasanton, CA, USA X-ray microscopes & lithography modules R&D, micro-optics Custom quote (often >$5k per setup)
KIT (Karlsruhe Institute of Technology) Karlsruhe, Germany LIGA process line, open user program Prototyping, academic collaborations $400–$900 (subsidized for research)
Eulitha Villigen, Switzerland Photon-based lithography (including XUV) Large-area nanostructuring $1,000–$2,500
LBNL (Lawrence Berkeley National Lab) Berkeley, CA, USA Advanced light source (ALS) beamlines Research-grade XRL $500–$1,500 (proposal-based)
Photon Source (KEK) Tsukuba, Japan PF ring, industrial consortium Japanese industrial partners $600–$1,000

I've personally worked with NTT-AT and KIT. NTT-AT runs a tight ship—their cleanroom discipline is impressive. KIT, on the other hand, offers more flexibility for experimental runs but expect longer lead times because of their academic schedule.

How to Evaluate an X-Ray Lithography Provider

Don't just look at the price list. Here are the criteria I use, refined after several painful experiences:

1. Synchrotron Beam Time Availability

Many X-ray lithography companies don't own their own synchrotron; they rent beam time. Ask about guaranteed access slots. I once signed a contract with a reseller who had only 2 weeks of beam time per quarter—our project got delayed 6 months.

2. Resist Compatibility & Process Support

Not all companies handle all resists—SU-8, PMMA, KMPR, etc. Make sure they've run your specific resist before. One provider I tried "claimed" PMMA expertise but ended up with severe cracking because of improper soft bake.

3. Metrology & Inspection

After exposure, you need to verify sidewall verticality and aspect ratio. Does the company have in-house SEM or AFM? Or do they ship it out? In-house inspection saves time and reduces handling damage.

4. Experience with Your Application

I always ask for case studies. For example, if you need high-aspect-ratio micro-needles, ask if they've done similar work. A generic fab might produce good patterns but fail on release or handling.

5. Cleanroom Class & Contamination Control

XRL is sensitive to particles. A Class 100 (ISO 5) cleanroom is the minimum for production. Anything less and your yield will tank.

Cost Breakdown for X-Ray Lithography Services

Let's get real about money. A typical engagement with an X-ray lithography company will include these line items:

  • Mask Fabrication: $2,000–$10,000 per mask (depending on absorber material and feature size).
  • Beam Time: $500–$2,000 per hour (usually billed in 8-hour shifts).
  • Resist coating & development: $100–$400 per wafer.
  • Metrology: $200–$800 per sample for SEM cross-section.
  • Project management / engineering support: often 20% surcharge on total.

For a small R&D run (10 wafers, 3 masks), expect $30k–$60k. For production volumes, unit price drops significantly—especially if you guarantee consistent volume.

My insider tip: Always ask about "engineering time" separately. Some companies bundle it, others charge hourly. I negotiated a cap on engineering fees with KIT that saved us $4k on a project.

Common Pitfalls When Working with X-Ray Lithography Firms

Over the years, I've seen colleagues fall into these traps. Avoid them:

  • Underestimating mask costs. A cheap mask (
  • Ignoring alignment marks. If your design needs multi-layer alignment, ensure the company has an alignment system (e.g., infrared or optical). Not all XRL beamlines have them.
  • Not verifying sidewall angle. I found one provider's sidewalls were 89.5° instead of 90°—that caused our micro-springs to fail. Ask for a test run before full production.
  • Skipping the passivation step. For some materials, hydrogen silsesquioxane (HSQ) or other passivation is needed to prevent cracking during development. Many companies skip it unless you insist.

Frequently Asked Questions

My MEMS design requires 200 μm thick resist with aspect ratio 50:1. Which X-ray lithography company should I choose?
You need a company with synchrotron access and deep XRL (DXRL) experience. KIT's LIGA process is ideal—they routinely achieve aspect ratios >100:1 for thick resists. NTT-AT is another strong option for production. Avoid EUV-based firms; they can't handle such thickness.
How long does a typical prototyping cycle take with an X-ray lithography company?
From mask design to final parts, expect 8–16 weeks for prototyping. Mask fabrication takes 2–4 weeks, beam time scheduling 2–4 weeks (often the bottleneck), and processing/metrology another 2–4 weeks. I suggest booking beam time as early as possible—some synchrotrons have 3-month waiting lists.
What is the biggest hidden cost when outsourcing X-ray lithography?
Shipping and handling of sensitive masks and wafers. One of my prototypes was damaged because the company used standard packaging vs. anti-static, shock-proof boxes. Always specify handling requirements in the contract. Also, rework costs if the first exposure fails—negotiate a clause for free re-run within a window.
Can I get X-ray lithography done in the United States without a synchrotron facility?
Yes, through national labs like LBNL (ALS) or via contract manufacturers that partner with synchrotron sources. The Advanced Photon Source at Argonne also supports commercial access. However, US-based dedicated XRL service providers are limited compared to Japan and Germany. For US companies, LBNL's user program is the most accessible entry point.

This article is based on personal experience and industry knowledge. All facts have been checked against publicly available information from synchrotron facilities and company documentation.