Young’s double slit experiment

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Presentation transcript:

Young’s double slit experiment

Young’s Double Slit Experiment YAY!

What is it? First conducted in 1801 by Thomas Young Light passed through a barrier with two slits (before it usually passed through a single slit to make the light coherent) The light diffracted through each slit Created interference pattern In order to interfere the light that passes through the slit must be of the same frequency and polarization and it must be coherent

Particles vs. Waves Particle Wave If light acts as a particle, only two slits will appear on the screen The light will diffract and interfere, making many fringes

Why is this important? This proves light acts not only as a particle, but also as a wave!

is the path length difference. constructive interference destructive interference n = 0, ±1, ±2, ±3, ±4 etc

Equations for the Fringes λ/s=w/D w w=λD/s

Many Photon Interference Acquisition Time: .1 sec Attenuation: 3 optical depths Amplification: x1

Single Photon When a single photon is used, wave interference is still present It is impossible for a photon to act as a wave as it is can only go through one slit If one slit is blocked, there is no interference

Important Observations When path of photon is unknown, fringes are observed When path of photon is known, fringes are not observed

Summary Young’s Double Slit Experiment Fringes were observed under high intensity, as well as with only a single photon.

Conclusion Single photons behaved the same way as the high intensity beam. In the double slit experiment, the single photon appeared to interfere with itself – going through both slit simultaneously.

Sources http://dev.physicslab.org/asp/applets/doubleslit/default.asp http://www.studyphysics.ca/newnotes/20/unit04_light/chp1719_light/lesson58.htm http://dev.physicslab.org/asp/applets/doubleslit/default.asp http://physics.about.com/od/lightoptics/a/doubleslit.htm http://www.physics.brown.edu/physics/demopages/Demo/modern/demo/7a5520.htm The book – Seeing the Light From Jeff, Jacob, Bryce, Edward, and Julie