Photolithography Fabrication
Photolithography Fabrication - 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.
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.
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.
07:51
Fabrication of Silica Ultra High Quality Factor Microresonators
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Cited by 22 •
2012
We describe the use of a carbon dioxide laser reflow technique to fabricate silica resonant cavities, including free-standing microspheres and on-chip microtoroids. The reflow method removes surface imperfections, allowing long photon lifetimes within both devices. The resulting devices have ultra high quality factors, enabling applications ranging from telecommunications to biodetection.
FAQs
The photoresist chemistry determines which regions remain after development. In one formulation, illuminated areas are removed; in another, illumination leaves those areas protected while unexposed material is removed. This contrast converts the photomask’s design into a patterned resist layer, so selecting the resist behavior is essential for obtaining the intended geometry before later fabrication steps.
Feature size, layout, and surface structure are central control variables because they determine the physical environment created on the substrate. Adjusting them changes the geometry available for channels, sensors, cell culture, or tissue-engineering components. Reproducible control of these parameters allows researchers to compare biological responses under defined conditions rather than relying on irregular or poorly characterized surfaces.
The patterned resist acts as an intermediate guide for transferring the selected geometry into a device. Depending on the fabrication route, the pattern can direct etching, deposition, or molding, allowing the substrate or another material to acquire the intended structure. This intermediate stage connects optical patterning with the production of functional microscale components.
A typical workflow begins by coating a substrate with a light-sensitive photoresist. The coated surface is then exposed through a photomask containing the desired geometric design. Development selectively removes illuminated or protected regions according to the resist chemistry. The remaining pattern can subsequently guide etching, deposition, or molding to produce the targeted microscale structure.
The essential elements are a substrate, a light-sensitive photoresist, a photomask carrying the desired geometry, and a development step that selectively removes part of the resist. Exposure establishes where the pattern is transferred, while the resist chemistry determines which regions survive. Together, these components provide the basis for controlled, repeatable microscale fabrication.
Bioengineers can use the technique to create microfluidic channels, biosensors, cell-culture platforms, and components for tissue-engineering systems. These structures provide defined geometries and surface features for examining cellular and biological processes. The ability to reproduce layouts and microscale dimensions also supports controlled comparisons between experimental conditions and helps connect device structure with biological behavior.