1. Optics and Holography

2. Technical Background - Wave Nature of Light - Interference
~constructive
~destructive
- Diffraction

3. Bragg Equation
2d sin(θ)=nλ

4. Types
Reflection
Transmission
Reflection Hologram Sticker

5. Applications Counterfeit protection Data Storage
Heads Up Display (fighter pilots)

6. Holographic Film Storage of holograms Refractivity
Interference patterns
Changes in transmittance properties
Refractivity
Speed of light in different mediums
Bending light beams

7. Photorefractive Polymer Film
Components
Structure (A)
Sensitizer (B)
Dye molecules (C)
Plasticizer (D)
How it works
Electrons mobilized
Internal electrical fields created
Dye molecules orient forming a diffraction grating A B C D - - -

8. Experimental Setup
Light Source
Beam Splitter
Lenses and mirrors
Film

9. Exp. Setup Cont’d

10. Data Collection Fine tuning Reading Hologram Digital Photography
Beam Alignment
Stability
Exposure time
Reading Hologram
Digital Photography

11. B (brightness in McGees)
Data Analysis
ImageJ Software
Mean Brightness
Exponential Decay
DATA TABLES
For the “D” holograms
t (time in seconds)
B (brightness in McGees) 15
18.95 30
17.55 45
17.14 85
16.96
180
16.90

12. Data Analysis, cont’d Exponential Decay Degradation starts fast
Slows down as time goes on

13. Data Analysis, cont’d Exponential Regression for “D” holograms
B = 6.62e-.0803t
Constant represents minimum brightness
Root Mean Square Error: < 0.05

14. Data Analysis, cont’d Exponential Regression for “Russia” holograms
B = 1.97e-0.024t
RMSE < 0.07

16. Conclusion Organic films store holograms
Measure decay: digital photography
Future research
More multiple holograms
Data storage

17. Acknowledgements National Science Foundation Dr. David McGee
Katy Rolfe
Dr. James Fukanaga
Melissa Yang
Anthony Miller
Nathaniel Woodward
Jackie Haynicz

19. ¿QUESTIONS?