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Multiphoton lithography

Multiphoton lithography is a 3D microfabrication technique that uses a focused laser to create tiny structures inside a photosensitive material. Instead of exposing the whole material at once, it relies on nonlinear optics: a single point is illuminated with very high light intensity so that multiple photons combine th

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  1. What “multiphoton lithography” means

    Multiphoton lithography is a 3D microfabrication technique that uses a focused laser to create tiny structures inside a photosensitive material. Instead of exposing the whole material at once, it relies on nonlinear optics: a single point is illuminated with very high light intensity so that multiple photons combine their energy to trigger a chemical reaction only at the focal spot. This enables highly precise, voxel-by-voxel (3D pixel) writing.

  2. How it works (high level)

    A laser is tightly focused into a resin or photoresist. When the local intensity is high enough, multiphoton absorption occurs and the material crosslinks or polymerizes at that point. By moving the sample or scanning the laser in a controlled pattern, the exposed regions build up a three-dimensional structure. Common variants include two-photon and three-photon processes, depending on the wavelength and material response.

  3. Typical uses and key advantages

    Multiphoton lithography is used to fabricate micro-optical components, photonic structures, biomedical scaffolds, and complex microfluidic or MEMS-related features. Its main advantages are fine spatial resolution (often on the order of sub-micron to a few microns), the ability to write inside bulk material (not just on the surface), and compatibility with complex 3D geometries. Limitations can include slower write speeds and the need for suitable photoresists and laser systems.

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FAQ

Is multiphoton lithography the same as 3D printing?

It’s a form of additive microfabrication, but it typically uses laser-induced photochemistry with much higher precision than many consumer 3D printers.

What determines the resolution?

Laser wavelength, focusing optics (numerical aperture), exposure threshold of the resist, and scanning/voxel size.

Are there safety considerations?

Yes—laser systems can be hazardous to eyes and skin. Follow institutional laser safety procedures and use appropriate protective eyewear and enclosures.

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