Computer-generated holography

Computer Generated Holography 1.2.1 Diffraction Through an Aperture... 

In order to understand how nano technology can be used in computer generated holography, we need understand the basics of diffraction theory. This is covered in much better detail in several fundamental texts [12, 13], so we will only summarise the key aspects in this chapter. Let us assume we have an arbitrary aperture (hole) function, A x, y) in the plane S as shown in Fig. 1.1, with coordinates [x, y]. The light passing through this aperture will be diffracted at its edges and the exact form of this pattern can be calculated. We want to calculate the field distribution at an arbitrary position away at the point P, which is a distance R from the aperture. 

Zito G, Piccirillo B, Santamato E, Marino A, Tkachenko V, Abbate G (2008) Two-dimensional photonic quasicrystals by single beam computer-generated holography. Opt Express 16 5164-5170... 

Photoresists. These are used in holography because they can be employed to map holographic exposures into surface relief. This property is utilised in the production of embossing masters, reflection and transmission gratings and in computer generated holograms. 

Other classes of holograms also exist, such as polarization holograms, rainbow holograms, synthetic holograms, and computer-generated holograms. However, these are specialized topics that are best dealt with separately from the central concepts of holography. 

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