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==Digital Planar Holography == |
==Digital Planar Holography == |
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Digital Planar Holography (DPH) is a new technology, developed recently for fabricating miniature components for [[integrated optics]]. The essence of the DPH technology is embedding [[Digital holography|digital holograms]], calculated in a computer, inside a [[Waveguide (optics)#Dielectric slab waveguide|planar waveguide]]. This allows for light propagation in the hologram plane rather than in the perpendicular direction and results in a long interaction path. Benefits of a long interaction path are well known for [[Volume hologram|volume/thick holograms ]]. On the other hand planar configuration provides easy access to the surface, where the hologram should be embedded. |
Digital Planar Holography (DPH) is a new technology, developed recently for fabricating miniature components for [[integrated optics]]. The essence of the DPH technology is embedding [[Digital holography|digital holograms]], calculated in a computer, inside a [[Waveguide (optics)#Dielectric slab waveguide|planar waveguide]]. This allows for light propagation in the hologram plane rather than in the perpendicular direction and results in a long interaction path. Benefits of a long interaction path are well known for [[Volume hologram|volume/thick holograms ]]. On the other hand planar configuration provides easy access to the surface, where the hologram should be embedded.<br> |
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As it is well known, light can be confined in waveguides by a refractive index gradient. Light propagates in a core layer, surrounded with a cladding layer(s), which should be selected the core refractive index ''N''<sub>core</sub> is greater than that of cladding ''N''<sub>clad</sub> : <sub>''N''core</sub> > ''N''<sub>clad</sub>. Cylindrical waveguides [[optical fiber|(optical fibers)]] allow for one-dimensional light propagation along the axis. Planar waveguides, fabricated by sequential depositing flat layers of transparent materials with a proper refractive index gradient on a standard wafer, confine light in one direction (axis z) and permit free propagation in two others (axes x and y). |
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Revision as of 18:13, 6 August 2008
Digital Planar Holography
Digital Planar Holography (DPH) is a new technology, developed recently for fabricating miniature components for integrated optics. The essence of the DPH technology is embedding digital holograms, calculated in a computer, inside a planar waveguide. This allows for light propagation in the hologram plane rather than in the perpendicular direction and results in a long interaction path. Benefits of a long interaction path are well known for volume/thick holograms . On the other hand planar configuration provides easy access to the surface, where the hologram should be embedded.
As it is well known, light can be confined in waveguides by a refractive index gradient. Light propagates in a core layer, surrounded with a cladding layer(s), which should be selected the core refractive index Ncore is greater than that of cladding Nclad : Ncore > Nclad. Cylindrical waveguides (optical fibers) allow for one-dimensional light propagation along the axis. Planar waveguides, fabricated by sequential depositing flat layers of transparent materials with a proper refractive index gradient on a standard wafer, confine light in one direction (axis z) and permit free propagation in two others (axes x and y).