micro-scale rapid prototyping melissa appel eric dávila andrew maclennan
TRANSCRIPT
Micro-scale Rapid Prototyping
Melissa Appel
Eric Dávila
Andrew Maclennan
Overview
Background
Purpose
Prior Work
Experimental Setup
Improvements Needed
What We’ve Done
Future Work
But First…
What’s the difference between a
Moose
and an
Ant?
Give Up?
A Moose has Antlers, but an Ant doesn’t have Mooselers!
We apologize for the preceding slides. Those responsible have
been sacked.
And Now On With the Show…
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
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
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
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
Experimental Setup
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
What We’ve Done
New Spin Coater
Optimized Thin Film Parameters
Built Multi-Layered Structures (we think)
“Huffed”
Catalogued Our Work
New Spin Coater
Slide Lies Flat
Air Circulation Minimized
Slide Removal Easier
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
Built Multi-Layered Structures (we think)
The Great Pyramids:
…And Now, For Something Completely Different…
Our Plan For World Domination
Our Plan For Multilayer Construction
Spin Thick Layer of SU-8
Cure a Tall Column
Develop Negative Resist
Spin Alternating Layers of SU-8 and FSC
Cure All Layers
Develop All Cured ResistsUncured SU-8 and all FSC will be developed away.
Catalogued Our Work
Edited Existing LabVIEW VI’s
Using LabVIEWSnapped PicturesMeasured Line Thicknesses
Some Pictures
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
More Pictures
Future Work
Improve the Stage
Thinner Lines
Multilayer Structures with Overhang
Take Pictures of Slides at an Angle
The “Working Hard” Slide