ETEL has launched the METIS HP, a full air bearing planar motion platform aimed at step-and-scan semiconductor workloads — direct laser writing and high-resolution optical inspection chief among them. The platform comes from a motion-control house with direct lineage to HEIDENHAIN, the German encoder and measurement specialist that owns ETEL and supplies much of the metrology-grade feedback technology this class of stage depends on.

The company describes METIS HP as its answer to what it calls the most demanding scanning applications in semiconductor manufacture. That phrase covers processes where the stage, not the optics, often sets the floor on achievable resolution: laser direct-write lithography for advanced packaging and mask fabrication, and inspection systems that must raster a sensor or beam across a wafer while holding position error to nanometre order.

What does a full air bearing planar stage buy you?

In a planar motor stage, the moving carriage floats on a cushion of air rather than riding mechanical guides, and the drive force comes from a direct-drive linear or planar motor with no contact, no gears, and no backlash. A "full" air bearing design means every constrained degree of freedom — not just the vertical axis — runs on air films. The metrologist's argument for this architecture is straightforward. Contact bearings inject friction, wear particles, and stick-slip nonlinearity into the loop; air films remove all three, at the cost of stiffness and the need for a filtered, dry air supply in the cleanroom.

For step-and-scan motion, the payoff appears in the velocity flatness during the scan stroke and the settling behaviour after each step. Direct laser writing exposes resist while the stage moves at constant velocity; any velocity ripple maps directly into dose and linewidth error. Inspection systems inherit the same constraint — a fluctuating scan speed smears the effective point-spread function of the optics.

How does it fit ETEL's portfolio?

ETEL positions itself as a supplier of both motion-control components and complete motion platforms, and METIS HP lands squarely in the second category. Integrators of lithography tools and inspection systems typically buy a stage, drives, and controllers as a matched set, because the achievable servo bandwidth depends on the resonances of the whole assembly rather than any single part. The HEIDENHAIN connection matters here: the group's encoder division produces the position-feedback scales against which such stages are closed-loop controlled, so the platform arrives with an in-house measurement chain from scale read-head to controller.

What remains to be quantified?

ETEL's announcement names the application space and the architecture but stops short of publishing a specification table. Buyers will want the numbers that separate competing planar stages: position stability over the travel, velocity ripple during scan, planarity of the air bearing over the full stroke, and load capacity under vacuum or cleanroom conditions. Vendor datasheet claims in this market routinely quote nanometre-level figures measured under narrow test conditions — settled load, controlled temperature, specific scan lengths — so integrators will need those test conditions stated before they can compare METIS HP against entrenched step-and-scan stage suppliers.

The launch also raises the compliance question that follows every semiconductor tooling introduction: whether the platform's materials, air consumption, and particle generation meet the cleanliness class of the fabs expected to deploy it. ETEL has not yet published those environmental limits.