Issue 8, 2008
From the journal:

Lab on a Chip

Maskless photolithography using UV LEDs†‡

Rosanne M. Guijt*a  and  Michael C. Breadmorea  

* Corresponding authors

a Australian Centre for Research on Separation Science, Private Bag 75, Hobart, Australia
E-mail: Rosanne.Guijt@utas.edu.au
Fax: +61 3 6226 2858
Tel: +61 3 62262171

Abstract

A UV light emitting diode (LED) with a maximum output of 372 nm was collimated using a pinhole and a small plastic tube and focused using a microscope objective onto a substrate for direct lithographic patterning of the photoresist. Movement of the substrate with a motorised linear stage (syringe pump) allowed lines in SU-8 to be pattered with a width down to 35 μm at a linear velocity of 80 μm s−1, while in the dry film resist Ordyl SY 330, features as narrow as 17 μm were made at a linear velocity of 245 μm s−1. At this linear velocity, a 75 mm long feature could be patterned in 5 min. Functional microfluidic devices were made by casting PDMS on a master made by LED lithography. The results show that UV LEDs are a suitable light source for direct writing lithography, offering a budget friendly, and high resolution alternative for rapid prototyping of features smaller than 20 μm.

Graphical abstract: Maskless photolithography using UV LEDs

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Article information

DOI
https://doi.org/10.1039/B800465J
Article type
Technical Note
Submitted
11 Jan 2008
Accepted
12 May 2008
First published
23 Jun 2008

Lab Chip, 2008,8, 1402-1404

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Maskless photolithography using UV LEDs

R. M. Guijt and M. C. Breadmore, Lab Chip, 2008, 8, 1402 DOI: 10.1039/B800465J

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