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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesMicromachines are tiny devices built to perform mechanical functions. Many are microelectromechanical systems (MEMS), which combine moving or flexible structures with electrical components or sensing capabilities. They are designed around both the job they must do and the materials and manufacturing processes that can reliably make them.
What counts as a micromachine?
“Micromachine” is a broad description rather than one specific device type. It can refer to a small structure that moves, senses, filters, or otherwise performs a mechanical task. Many micromachines are MEMS: integrated systems that combine mechanical elements with electrical, sensing, or signal-processing functions. MEMS can also include components that do not visibly move, such as resonators and RF filters.
Examples include accelerometers and gyroscopes that measure motion, pressure sensors and microphones, resonators and oscillators used for timing, RF filters for communications, microfluidic devices, biomedical diagnostic components, and micro-optical parts. NIST describes MEMS applications in wireless communications, automobiles, aerospace, medical devices, and consumer products. NIST’s overview of micro- and nanoelectromechanical systems also covers sensing, timing, signal processing, microfluidics, and optical or electronic biosensing.
How are micromachines designed?
Design starts with the device’s purpose: what it must sense, move, filter, or control, and how it must connect mechanically and electrically to its surroundings. Engineers use computer-aided design methods informed by both integrated-circuit design and mechanical engineering. The design must also match the chosen manufacturing process; a shape that works in a simulation may not be practical to fabricate, release, package, or connect.
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Process selection affects the shapes and dimensions a device can have, the minimum feature sizes, the chip dimensions, and how much of the system can be integrated on one chip. Those choices also affect complexity, cost, and manufacturing yield. Microscale material behavior can differ from behavior at larger scales, so material properties and reliability must be considered at the scale where the device operates. NIST discusses these issues in its guidance on small-scale mechanical testing.
How are micromachines made?
Many MEMS devices are batch-fabricated on wafers using processes adapted from integrated-circuit manufacturing. A typical sequence patterns selected areas, removes material by etching, and adds material by deposition. The exact order and materials depend on the device and process.
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- Pattern the wafer. A wafer is coated with a light-sensitive resist. Lithography uses a patterned mask and light exposure to change the resist in selected areas; a developer then removes the chosen portions, leaving a pattern for later steps. NIST describes this workflow in its account of the NanoFab’s lithography, etching, and deposition capabilities: NIST’s April 3, 2023 NanoFab article.
- Shape or build the structure. Etching removes exposed material, while deposition adds films to the wafer. Repeating patterning, etching, and deposition can create the device’s mechanical features and electrical connections.
- Release structures when needed. In some surface-micromachined designs, a temporary sacrificial layer supports a structural layer during fabrication. A selective etch removes the sacrificial material at the end, freeing the structure to move.
- Package and connect the device. The finished structure must be protected and connected to its electrical circuit and operating environment. Packaging and interfacing are part of manufacturing, not an afterthought.
In the 2023 NIST article, NanoFab manager Rob Ilic described the facility’s capabilities this way: “The NIST NanoFab offers a complete toolset in all these areas,” referring to lithography, etching, deposition, and nanocharacterization.
Bulk versus surface micromachining
The key difference is where the device’s mechanical structure comes from. In bulk micromachining, the structure is formed from the wafer or substrate itself. In surface micromachining, it is built from deposited and patterned layers on the substrate.
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| Approach | Where the structure comes from | How it is made | Important consideration |
|---|---|---|---|
| Bulk micromachining | The substrate, often silicon | Etching removes selected regions of the wafer to form features such as cantilevers, diaphragms, or orifices. | The substrate itself supplies the structure; suitable shapes depend on the material and etching process. |
| Surface micromachining | Deposited thin films on the substrate | Structural films are patterned, often over sacrificial layers that are selectively removed to release moving parts. | Released structures can stick to the substrate during processing or drying, a failure mode known as stiction. |
Neither approach is universally better. The right choice depends on the required geometry, materials, integration needs, and production constraints. Surface processes can fabricate many structures in batches, but releasing and drying suspended parts requires care. These distinctions and trade-offs are covered in the National Research Council’s 1997 volume Microelectromechanical Systems: Advanced Materials and Fabrication Methods.
Micromachining does not always mean silicon
Some micromachines use a route that builds metal structures rather than etching a silicon wafer. Sandia National Laboratories’ metal micromachining process patterns a resist mold on a metalized surface, fills the mold by electroplating, and may finish the part with lapping or polishing. Sandia describes this method as a way to make specialized, thick, high-aspect-ratio 2.5D metal structures. It is a distinct option, not a substitute for every wafer-based MEMS process. Sandia’s Metal Micromachining Program explains the approach.
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Why fabrication and packaging are challenging
Small dimensions make process control consequential: a small change in a feature can affect how a sensor or moving structure behaves. Fabrication also has to balance geometry, material compatibility, integration, complexity, cost, and yield. With surface micromachining, for example, the structure may be fabricated successfully but stick to the substrate during release or drying.
Packaging presents a separate challenge because the device has to interact with its real environment while remaining protected and properly connected. A 1997 National Research Council report stated that packaging, interfacing, and assembly “can easily represent up to 80 percent of the cost of a component.” That is a historical statement from the report, not a current universal estimate for MEMS manufacturing. The report emphasizes that these are critical final production steps, alongside fabrication itself.
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