ENGRI1110_Lect11_08 - Diffraction of Waves Slits cause...

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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 order 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 (2D or 3D) Spacing of the array must be close to the wavelength of light Light entering the array will
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ENGRI1110_Lect11_08 - Diffraction of Waves Slits cause...

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