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Grid-free 3D multiple spot generation with an efficient single-plane FFT-based algorithm

David Engström ; Anders Frank ; Jan Backsten ; Mattias Goksör ; Jörgen Bengtsson (Institutionen för mikroteknologi och nanovetenskap, Fotonik)
Optics Express (1094-4087). Vol. 17 (2009), 12, p. 9989-10000.
[Artikel, refereegranskad vetenskaplig]

Algorithms based on the fast Fourier transform (FFT) for the design of spot-generating computer generated holograms (CGHs) typically only make use of a few sample positions in the propagated field. We have developed a new design method that much better utilizes the information-carrying capacity of the sampled propagated field. In this way design tasks which are difficult to accomplish with conventional FFT-based design methods, such as spot positioning at non-sample positions and/or spot positioning in 3D, are solved as easily as any standard design task using a conventional method. The new design method is based on a projection optimization, similar to that in the commonly used Gerchberg-Saxton algorithm, and the vastly improved design freedom comes at virtually no extra computational cost compared to the conventional design. Several different design tasks were demonstrated experimentally with a liquid crystal spatial light modulator, showing highly accurate creation of the desired field distributions.



Denna post skapades 2010-03-01. Senast ändrad 2013-10-29.
CPL Pubid: 116772

 

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Institutioner (Chalmers)

Institutionen för fysik (GU) (GU)
Institutionen för mikroteknologi och nanovetenskap, Fotonik

Ämnesområden

Fysik
Optik
Beräkningsfysik

Chalmers infrastruktur