ENGRI1110_Lect10_Sept18_09_posted

ENGRI1110_Lect10_Sept18_09_posted - Monday: Guest Lecturer...

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Monday: Guest Lecturer on Energy and Climate Prof. Rick Allmendinger, Earth and Atmospheric Sciences Read:  Problems of the Energy Economy, appendix G3
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Wha t a b o ut a  Pho to nic  Na no po lis ? Photonic Micropolis
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Diffraction of Waves Slits cause constructive interference Can this be used to control flow of light?
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Photonic Crystals Electronic Devices: guide electrons The electronic band gap is a forbidden zone: range of energies  electrons cannot occupy Devices function by controlling availability of electrons and holes  above and below the band gap Photonic crystals: “semiconductors for light”  light confined in bands - guide light structures with features of same dimension as wavelength of light E. Yablonovitch, Scientific American, p.48, Dec. 2001
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Photonic Crystals Perfect cancellation in all directions for some  wavelengths results in a photonic band gap Light cannot travel through the material Total reflection for some or all wavelengths Partial or complete photonic band gap
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Photonic Crystals Array of regularly spaced pores in a dielectric Spacing of the array must be close to the wavelength of light  Light entering the array will  refract  and partially  reflect as it moves between the material/air interfaces
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ENGRI1110_Lect10_Sept18_09_posted - Monday: Guest Lecturer...

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