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CD diffraction
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CD Diffraction
CD Diffraction
Jeykiran and Gabbie
CD's structure and properties
What is a CD?
How does it work?
CD's structure
- Introduced in 1982
- Its made out of aluminum and plastic
- Can store from 600 MB - 750 MB
- The main of types of CDs are:
- CD-ROM
- CD-RW
https://giphy.com/gifs/cd-dvd-optical-3oEhmM10mIi1dkMfmg
What is a CD?
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2
3
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CDs are mainly made up of 4 layers:
1. Thin plastic used for labeling
2. Hard plastic coating
3. Reflective layer which stores data.
4. Protective clear polycarbonate.
https://azuradisc.com/about-discs/how-a-cd-is-made/?v=3e8d115eb4b3
CD Structure
How does it store data?
- Laser etches indentations
- Pits are usually 100nm X 500nm X 700 nm
- Represents data in binary.
- Pits represent 0s and lands represent 1s
https://www.quora.com/Why-does-a-CD-reflect-rainbow-colors
Interference
Diffraction
Diffraction
Interference
Diffraction grating
The physical phenomenon
https://physics.highpoint.edu/~jregester/potl/Waves/DiffractionInterference/Diffraction.html
https://courses.lumenlearning.com/boundless-physics/chapter/diffraction/
Diffraction grating
How does everything relate to CD?
Diffraction due to pits
Huygens principle
500 nm
Interference
References
References
Compact Disc. McGill Encyclopedia . (2016, November). Retrieved from https://www.cs.mcgill.ca/~rwest/wikispeedia/wpcd/wp/c/Compact_Disc.htm
Cope, J. A. (1993). The physics of the compact disc. Physics Education, 28(1), 15–21. https://doi.org/10.1088/0031-9120/28/1/003
Epstein, P. (2019, July). Types of compact discs. Techwalla. Retrieved from https://www.techwalla.com/articles/types-of-compact-discs
Ling, S. J., Sanny, J., & Moebs, W. (2017). University physics: Volume 1. OpenStax, Rice University.
Tellinghuisen, J., & Salter, C. (2002). Exploring the diffraction grating using a he-ne laser and a CD-ROM. Journal of Chemical Education, 79(6). https://doi.org/10.1021/ed079p703