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Micro-scale Rapid Prototyping
Melissa Appel
Eric Dávila
Andrew Maclennan
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Overview
Background
Purpose
Prior Work
Experimental Setup
Improvements Needed
What We’ve Done
Future Work
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But First…
What’s the difference between a
Moose
and an
Ant?
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Give Up?
A Moose has Antlers, but an Ant doesn’t have Mooselers!
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We apologize for the preceding slides. Those responsible have
been sacked.
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And Now On With the Show…
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Background
Butterflies Butterflies’
wings have millions of scales, each of which has hundreds of structures on its upper surface.
ridges
crossrib
lamellae
lower lamina
upper lamina
~0.5 m
scale cross section
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Purpose
To Discover More about Butterfly Wings
How they Trap Heat
How they Display Colors
thin film
air
airsubstrate
incident radiation reflected radiation
transmitted radiation
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Prior Work
Microscope Setup
CCD or photodiode
Field limiting aperture
Eyepiece
Objectives
Sample holder stage
Focus wheel
Iris & field diaphragm
Illumination forreflection
Illumination fortransmission
Photometry view port
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Modeling these Structures
Single Layer Structure Spin out a Thin Layer of
SU-8 on a Glass Slide Cure a Pattern in the
SU-8 Using UV Light Develop the Slide to
Wash Away Unexposed SU-8
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Experimental Setup
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Improvements Needed
Stage MovementSpin CoaterOptimize Thin Film Parameters Pre-baking Resist Application Curing Speeds for Better
Resolution Substrate: Glass or Silicon Developing Process
Multilayer Structures
X
Y -Into/out of page Plate
Stepper motor
Linear ball bearing slides
Micro-positioning stages
L brackets
Z
7.5”
7.5”
h = 0.1875”Cutout
Clamps
Simple support
Existing Stage
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What We’ve Done
New Spin Coater
Optimized Thin Film Parameters
Built Multi-Layered Structures (we think)
“Huffed”
Catalogued Our Work
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New Spin Coater
Slide Lies Flat
Air Circulation Minimized
Slide Removal Easier
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Optimized Thin Film Parameters
Amount of Resist Placed on SlidePre-exposure Baking Air Bubbles Minimized
Curing Speeds for Better Resolution 1 & 5 Micron Films
Tried Silicon Wafers Washed Developer with Isopropyl Alcohol or Acetone
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Built Multi-Layered Structures (we think)
The Great Pyramids:
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…And Now, For Something Completely Different…
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Our Plan For World Domination
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Our Plan For Multilayer Construction
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Spin Thick Layer of SU-8
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Cure a Tall Column
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Develop Negative Resist
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Spin Alternating Layers of SU-8 and FSC
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Cure All Layers
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Develop All Cured ResistsUncured SU-8 and all FSC will be developed away.
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Catalogued Our Work
Edited Existing LabVIEW VI’s
Using LabVIEWSnapped PicturesMeasured Line Thicknesses
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Some Pictures
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Slide: 1 Box: B film thickness: 1 m speed: X: 15, Y: 20 Objective: 50x
Line thickness: 20 m Line thickness: 20 m
X Y
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More Pictures
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Future Work
Improve the Stage
Thinner Lines
Multilayer Structures with Overhang
Take Pictures of Slides at an Angle
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The “Working Hard” Slide