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Microscale Rapid Prototyping
Melissa Appel
Eric Dávila
Andrew Maclennan
Overview
• Review of Last Presentation– Purpose– Modeling the Scale Structures
• Progress
• Future Work
Purpose
• To Discover More about Butterfly Wings by Modeling Their Scale Structures
lower lamina
ridges
crossrib
lamellae
upper lamina
~0.5 m
scale cross section
–How they Trap Heat
–How they Display Colors
Modeling the Scale 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
Progress
• “Fixed” the SU-8, FSC Interaction Problem
• Better Way of Aligning Cure Pattern (Bottom Light)
• Took Pictures at an Angle
• Further Improved LabVIEW VI’s
• Offset for UV Curing
• New Ideas For Creation of Overhang
“Fixed” SU-8, FSC Interaction
• Problem: SU-8, When Not Cured, Dissolves FSC
“Fixed” SU-8, FSC Interaction
• Solution: One of Them Has to Go– Use SU-8 for Thick Column
• SU-8 Is Still Best for High Aspect Ratio
– Use Norland Optical Adhesive 81 for Layers between FSC
• NOA 81 Does Not Dissolve the FSC
Aligned Cure Pattern
• Problem: Hard To Align Multiple Patterns
Aligned Cure Pattern
• Solution: View Both Existing Pattern and Spot Light
» To Cure: Shine Light Through the Spotlight from the Top
» To See the Sample, Transmit Light from the Bottom
Eyepiece
Objectives
Sample holder stage
Focus wheel
Illumination forreflection
Illumination fortransmission
Took Pictures at an Angle
normal incidence 35 degree tilt 75 degree tilt
70 m
Further Improved LabVIEW VI’s
• Minimize Backlash– Slowed Ramp Rate– Slowed Pre-Run Speed
• Made Software Run Faster
Offset For UV Curing
• UV Light Has a Different Focal Length than White Light
Z Focal Offset: 21Line thickness: 26 m
Z Focal Offset: 15Line thickness: 22 m
Z Focal Offset: 9Line thickness: 17 m
New Ideas for Overhang
• Eat Away
• Diving Board
• Theme Day
Eat Away
• Spin and Cure 3 Layers: SU-8, FSC, NOA81
• Develop: Timing for “Eat Away” of FSC
Diving Board
Spin a Layer of FSC, with Tape
FSC Tape
Remove Tape
Spin and Cure NOA81
Develop to Remove FSC
Future Work
• Still Working on Overhang