29 lightRays

29 lightRays - Craig Ogilvie Craig Ogilvie 11 Summary of...

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Unformatted text preview: Craig Ogilvie Craig Ogilvie 11 Summary of Lecture 28 Sinusoidal traveling E/B wave Spatial characteristics: , k=(2 29/ Time characteristics: T, =(2 )/T E/B waves transport energy energy thru surface per area per time, S = power/area B E S = 1 2 m m B E S I = = Craig Ogilvie Craig Ogilvie 22 Goals Next Week and a Half Optics physical manipulation of E/B waves mirrors, lenses. More and more information is being carried by light rather than electrons in wires fast use different frequencies at same time => high bandwidth long-term: use quantum properties of light for encryption Goals for next week or so introduction to main concepts of optics polarization mirrors, lenses, fiber-optics how to spear-fish Craig Ogilvie Craig Ogilvie 33 Polarized Light E/B waves from a transmitter have E-fields oriented in a particular direction (demo), polarization direction Light from a light-bulb, E-field is in random directions the decay of excited atoms has no fixed orientation Head on view of light propagating towards you Different moments in time Craig Ogilvie Craig Ogilvie 44 Polaroid Sheets/Filters Long molecules lined up in stretched sheets Absorbs light: E-field component parallel to long molecules Light is sent through sheet E-field in one direction passes through sheet Parallel to short direction of molecules Craig Ogilvie...
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This note was uploaded on 09/20/2011 for the course PHYS 222 taught by Professor Johnson during the Spring '07 term at Iowa State.

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29 lightRays - Craig Ogilvie Craig Ogilvie 11 Summary of...

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