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Announcements 11/1/10

Announcements 11/1/10. Prayer Test going on… Lab 7 due on Friday. Horizontally Polarized Light. Credit: the next few slides are from Dr. Durfee. Vertically Polarized Light. Diagonally Polarized Light. Circularly Polarized Light. Elliptically Polarized Light. Unpolarized Light.

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Announcements 11/1/10

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  1. Announcements 11/1/10 • Prayer • Test going on… • Lab 7 due on Friday

  2. Horizontally Polarized Light Credit: the next few slides are from Dr. Durfee

  3. Vertically Polarized Light

  4. Diagonally Polarized Light

  5. Circularly Polarized Light

  6. Elliptically Polarized Light

  7. Unpolarized Light

  8. Thought question • What type of polarization is displayed in the animation? http://stokes.byu.edu/emwave_flash.html • Horizontally polarized • Vertically polarized • Other polarized • Non-polarized

  9. Circularly Polarized, pictures Pictures from Wikipedia

  10. Polarizers • Polaroid film • Crystals • Lines of wires • Polaroid Film • Crystals www.thorlabs.com

  11. Thought question • If you send horizontal linearly polarized light through a (perfect) vertical polarizer, how much of the light intensity will get through? • 0-20% • 20-40% • 40-60% • 60-80% • 80-100%

  12. Thought question • If you send horizontal linearly polarized light at 45 through a perfect vertical polarizer, how much of the light intensity will get through? • 0-20% • 20-40% • 40-60% • 60-80% • 80-100%

  13. Thought question • If you send circularly polarized light through a perfect vertical polarizer, how much of the light intensity will get through? • 0-20% • 20-40% • 40-60% • 60-80% • 80-100%

  14. Thought question • (Like HW 27-2) If you send horizontal linearly polarized light through a vertical polarizer, no light gets through because there is no component of the electric field in the light wave that is oscillating vertically. If you insert a diagonal polarizer at 45between the two, how much of the light intensity will now get through the final polarizer? • 0-20% • 20-40% • 40-60% • 60-80% • 80-100%

  15. Demos • Polarization configurations

  16. Reading Quiz • What do we call the angle at which light, reflected off of a (non-conducting) surface, is completely polarized? • Brewster’s Angle • Euler’s Angle • Maxwell’s Angle • Snell’s Angle • Sorenson’s Angle

  17. Remember these? (Fresnel Coefficients) • If near perpendicular (1-D problem) • For arbitrary angle (you don’t need to know for this class) What is s-polar? What is p-polar?

  18. t t r r T T R R Plots for air (n=1) to glass (n=1.5) s-polarization p-polarization field amplitudes vs q field amplitudes vs q Brewster’s angle! intensities vs q intensities vs q Do you always get a 180 phase shift upon reflection?

  19. Fresnel Coefficients, cont. • If near perpendicular (1-D problem) • For arbitrary angle (you don’t need to know for this class) Set numerator = 0, apply Snell’s Law… lots of algebra/trig… tanq1 = n2/n1

  20. Thought question • If you send an unpolarized beam at a piece of glass at Brewster’s angle, what happens? • The reflected beam is partially polarized • The reflected beam is completely polarized • The transmitted beam is partially polarized • The transmitted beam is completely polarized • More than one of the above Applications: Sunglasses Laser “Brewster windows”

  21. Brewster’s angle • Why does the light “care” about 90? Image from Wikipedia

  22. Reflection: microscopic details • How does the wire-line polarizer work? • Reflection off of a surface • Why are metals better reflectors than insulators are? • What is the emitted light from an oscillating electron? • Brewster’s angle: reflected ray at 90 to transmitted ray • What happens to p-polarization at this angle?

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