1. Microscale Rapid Prototyping Melissa Appel Eric Dávila Andrew Maclennan

2. Overview Review of Last Presentation –Purpose –Modeling the Scale Structures Progress Future Work

3. 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

4. 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

5. 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

6. “Fixed” SU-8, FSC Interaction Problem: SU-8, When Not Cured, Dissolves FSC

7. “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

8. Aligned Cure Pattern Problem: Hard To Align Multiple Patterns

9. 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 for reflection Illumination for transmission

10. Took Pictures at an Angle normal incidence35 degree tilt75 degree tilt 70  m

11. Further Improved LabVIEW VI’s Minimize Backlash –Slowed Ramp Rate –Slowed Pre-Run Speed Made Software Run Faster

12. Offset For UV Curing UV Light Has a Different Focal Length than White Light Z Focal Offset: 21 Line thickness: 26  m Z Focal Offset: 15 Line thickness: 22  m Z Focal Offset: 9 Line thickness: 17  m

13. New Ideas for Overhang Eat Away Diving Board Theme Day

14. Eat Away Spin and Cure 3 Layers: SU-8, FSC, NOA81 Develop: Timing for “Eat Away” of FSC

15. Diving Board

16. Spin a Layer of FSC, with Tape FSC Tape

17. Remove Tape

18. Spin and Cure NOA81

19. Develop to Remove FSC

20. Future Work Still Working on Overhang