Transcription of 14. Total Internal Reflection and Evanescent Waves
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14. Total Internal Reflection and Evanescent Waves
14. Total Internal Reflection and Evanescent WavesPhase shifts in reflectionTotal Internal Reflection and applicationsEvanescent wavesReminder: the Fresnel equations||cos( )cos( )cos( )cos( ) ittiittinnrnn ||2cos()cos( )cos( ) iiittintnn 2cos()cos( )cos( ) iiiittntnn cos( )cos( )cos( )cos( ) iittiittnnrnn s-polarized light:p-polarized light:And, for bothpolarizations: sin( )sin( ) iittnn plane of incidenceincident wavetransmitted waveinterfaceplane of incidenceincident wavetransmitted waveinterface || ititnnrrnn 00 Ifair to glass , at itinnr So there will be destructiveinterference between the incident and reflected beams near the surface, where they overlap in normal incidence, i= 0, we find:Phase Shift in ReflectionNote: for p-polarized light, the sign of r||changes for angles above Brewster s , ifni> nt(glass to air), r > 0, and there will be angle, iReflection coefficient, ||r0 30 60 90 Incidence angle, iReflection coefficient, ||r0 30 60 90 from air to glassBrewster s angleThe obvious answer is the front of the object, w
d e n c e wave transmitted wave interface p a n e o f n c i d e n c e ... (WDM) – using multiple wavelengths, each carrying an independent data stream, on a single fiber Current record (2011): 370 WDM channels, 273 Gb/sec in each channel. Beam steerers used to …
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