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A Comparative Analysis of Associative Properties of Fourier versus Walsh Digital Holograms

100%
Derzhypolskyy A., Melenevskyy D., Gnatovskyy A.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
1101-1106
EN
A digital implementation of the Fourier holography scheme with identical reference and signal beams is considered. Investigations of the properties of this scheme were reported on in a number of papers. At the same time a concept of virtual optics is widely used in data encryption and data processing, whereas digital implementation of the Fourier holography scheme may be provided using not only discrete Fourier transform. Another discrete digital transform may be used as soon as it has several properties similar to the Fourier transform. The Walsh transform is the subject to consider in this work. A comparison of digital Fourier and Walsh versions of the named holographic scheme is conducted by means of their associative properties. Considered is the retrieving of information stored in the hologram using parts of different amounts of the original data. Comparison is provided with the two types of data stored: a raster image representing visual information and an image representing a set of data bits. Comparable parameters are the mean image contrast for visual data image and the bit detection accuracy for a set of data bits.
2
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Holographic Fabrication of Periodic Microstructures in Dichromated Pullulan

100%
Savić-Šević S., Pantelić D., Gajić R., Isić G.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
1079-1082
EN
Photonic crystal structures are fabricated in dichromated pullulan by the holographic technique. Relief structures of photonic lattices with rectangular, rhombic, and hexagonal arrays of peaks and holes are obtained. The structures have periodicities of the order 1.1μm and depth of about 50 nm.
3
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Imaging and Patterning on Nanometer Scale Using Coherent EUV Light

100%
Wachulak P., Marconi M., Menoni C., Rocca J., Fiedorowicz H., Bartnik A.
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issue 2
403-407
EN
Extreme ultraviolet (EUV) covers wavelength range from about 5 nm to 50 nm. That is why EUV is especially applicable for imaging and patterning on nanometer scale length. In the paper periodic nanopatterning realized by interference lithography and high resolution holographic nanoimaging performed in a Gabor in-line scheme are presented. In the experiments a compact table top EUV laser was used. Preliminary studies on using a laser plasma EUV source for nanoimaging are presented as well.
4
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X-ray Holography with a Position Sensitive Detector

100%
Lausi A., Kopecky M., Busetto E., Savoia A.
Acta Physica Polonica A
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2002
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vol. 101
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issue 5
621-628
EN
Integrating photon collection on position sensitive detectors used in combination with an absorption filter offers many advantages in X-ray fluorescence holography experiments: (i) the simultaneous recording of the full hologram allows us to overcome most of the difficulties - notably the large number of experimental points and the precision requirements - that make the practical realization of the measurement of holographic patterns very difficult and time demanding also when using powerful synchrotron radiation sources; (ii) the high angular resolution and the very precise detection of intensities make the reconstruction of images of distant as well as light atoms possible; (iii) area detectors are readily available at most crystallography dedicated beamlines at synchrotron radiation sources, so there is no need of complex, dedicated instrumentation. As an example, the hologram of a CoO single crystal recorded on an imaging plate is reported, evidencing the images of atoms located up to more than 7Å far from the emitter and also of the light oxygen atoms.
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