Photolithography Patterning
Photolithography Patterning - 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.
05:25
Patterning of Embryonic Stem Cells Using the Bio Flip Chip
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Cited by 2 •
2007
We demonstrate a simple method for placing cells at desired locations on a substrate. This method patterns cells by flipping a silicone chip containing microwells filled with cells onto the substrate. This method provides a new way to modulate diffusible and juxtacrine signaling between cells.
FAQs
The photoresist acts as a light-sensitive intermediary between the design and the substrate. After coating, selected regions are exposed through the mask or projection system, and development produces a temporary pattern in the resist. That pattern defines the geometry available for subsequent processing, allowing the design to be transferred without immediately modifying the underlying layer.
Both approaches determine where light reaches the coated surface, so the developed resist reproduces the intended geometry in selected regions. This controlled exposure is central to accurate feature placement and size. In engineering fabrication, a patterned mask or projection system allows the same design logic to guide formation of microscale and nanoscale structures across a substrate.
Development creates a temporary resist pattern rather than the final device structure. Etching or deposition uses that geometry to modify the underlying layer, transferring the design into the material below. These steps convert the resist pattern into a more durable fabricated structure, while later resist removal clears the temporary coating for additional processing.
Resist removal clears the surface after the patterned geometry has been transferred into the underlying layer. This step prevents the temporary pattern from remaining as part of the fabrication result and prepares the substrate for subsequent operations. In a multistep engineering process, removal separates one patterning stage from the next and leaves the transferred structure accessible.
It supports integrated circuits, microelectromechanical systems, sensors, and microfluidic devices. These applications share a need to place small structures accurately and repeatably, but they use patterned layers for different device functions. The same fabrication approach therefore serves electronic, mechanical, sensing, and fluid-handling technologies within engineering.
Accurate, repeatable control allows a design to be reproduced as intended across fabrication steps and devices. In integrated circuits, MEMS, sensors, and microfluidic systems, the geometry established by the resist and transferred into underlying material becomes part of the device structure. Consistency in size and location consequently supports controlled fabrication of these patterned technologies.