ENGRI_111_15_photonics6 - ENGRI111 Photonic Crystals New...

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ENGRI111 Photonic Crystals
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New Optical Fibers? New Optical Fibers? Why not use air as the core in a fiber? Air suffers from no impurities, no scatterers Low refractive index makes it impossible to maintain total  internal reflection requirement Use a mirror Mirrors are not perfect –absorb light, light cannot travel far
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New Optical Fiber New Optical Fiber E. Yablonovitch, Scientific American, p.48, Dec. 2001 Hexagonal arrays of cylinders Light is confined in central cylinder Light confinement varies for different colors (wavelengths)
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Color in Nature Color in Nature Opal Butterfly E. Yablonovitch, Scientific American, p.48, Dec. 2001 Most systems: Absorption from pigments…but not always Color arises because of special structure at the scale of light’s wavelength Some light trapped but not all light
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Color in Some Biological Systems
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Photonic Crystals Photonic Crystals Electronic Devices: guide electrons The electronic band gap is a forbidden zone: range of energies 
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ENGRI_111_15_photonics6 - ENGRI111 Photonic Crystals New...

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