Photolithography
Photolithography - Related Videos
07:44
Microfabrication via Photolithography
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2023
The fabrication of BioMEM devices is often done using a microfabrication technique called photolithography. This widely used method utilizes light to transfer a pattern onto a silicon wafer, and provides the basis for the fabrication of many types of BioMEM devices. This video presents the photolithography technique, shows how the process is performed in the cleanroom, and introduces some applications of the process.
10:18
Multi-step Variable Height Photolithography for Valved Multilayer Microfluidic Devices
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Cited by 26 •
2017
Multilayer microfluidic devices often involve the fabrication of master molds with complex geometries for functionality. This article presents a complete protocol for multi-step photolithography with valves and variable height features tunable to any application. As a demonstration, we fabricate a microfluidic droplet generator capable of producing hydrogel beads.
08:15
Polymeric Microneedle Array Fabrication by Photolithography
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Cited by 24 •
2015
Here, we present a protocol describing a mold-free fabrication process of the polymeric microneedles by photolithography.
16:06
Fabrication of Micropatterned Hydrogels for Neural Culture Systems using Dynamic Mask Projection Photolithography
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Cited by 46 •
2011
Simple techniques are described for the rapid production of microfabricated neural culture systems using a digital micromirror device for dynamic mask projection lithography on regular cell culture substrates. These culture systems may be more representative of natural biological architecture, and the techniques described could be adapted for numerous applications.
09:46
Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators
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Cited by 1 •
2025
This article traces the life cycle of a silicon nitride membrane resonator, from design through fabrication to characterization.
FAQs
Pattern fidelity depends on matching the photomask, ultraviolet exposure, and photoresist response. The mask determines which surface regions receive light, while the resist converts that exposure into a developable pattern. Because the pattern is formed before etching or deposition, errors at this stage can be carried into the final structure, affecting the precision of biological devices.
Photoresist chemistry determines which material remains after development. In one formulation, exposure makes the illuminated regions removable; in another, development removes the unexposed regions instead. This distinction changes the polarity of the transferred pattern without changing the basic exposure sequence, allowing the same type of process to create different surface layouts for research devices.
After development, the remaining resist identifies the regions that should be protected or left available during a subsequent fabrication step. Etching can use this patterned layer to shape the underlying surface, whereas deposition can place material according to the same layout. Thus, development links the optical exposure stage to the physical structure ultimately used in a biological experiment.
A typical workflow starts by placing a light-sensitive photoresist on the target surface, aligning a photomask, and exposing selected regions to ultraviolet light. Development then removes the exposed or unexposed resist, according to its chemistry. The resulting pattern is used for etching or deposition, producing the channels, sensor features, or culture structures required by the device.
Photolithography enables microfluidic platforms to contain patterned channels and other structures that organize fluid movement. These geometries can help establish controlled flow and gradients, giving experiments a reproducible physical environment rather than relying on uncontrolled fluid distribution. In biology, that control supports studies in which cells experience defined positions or fluid conditions.
Within biology, the fabricated structures serve as experimental platforms rather than merely finished components. Microfluidic devices can support cell-behavior studies, while biosensors provide patterned architectures for diagnostic work. Cell-culture and tissue-engineering platforms use the same precision to position cells or shape their environment, and these systems can be applied to examining drug responses.