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PHYS 422 Lecture 7 EM Theory III

PHYS 422 Lecture 7 EM Theory III - Electromagnetic Theory...

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Electromagnetic Theory Electromagnetic Theory, Photons and Light III Photons, and Light III
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The Poynting Vector: Polarized Harmonic Wave G G G 1 B E S × = 0 μ Polarized EM wave: [ ] t r k E E ω = G G G G cos 0 [ ] t r k B B ω = G G G G cos 0 P ti t Poynting vector: ( ) [ ] t r k B E S ω μ × = G G G G G 2 0 0 0 cos 1 This is the instantaneous value: S is oscillating Light field oscillates at ~10 15 Hz - most detectors will see the average value of S .
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