Gabor zone plate with binary transmittance values

Beynon, T.D.; Kirk, I. W.; Mathews, T.R.

doi:10.1364/ol.17.000544

Cited by 42 publications

(14 citation statements)

References 8 publications

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“…The Fresnel zone plate is a binary version of the grayscale Gabor zone plate and differs by having multiple points of longitudinal focus, where the Gabor plate has a single focus. Beynon [20] described a binary version of the Gabor zone plate. At any radius r the value of the transmission is…”

Section: Binary Gabor Zone Platesmentioning

confidence: 99%

Multiple beam steering using dynamic zone plates on a micromirror array

Benton

2018

Opt. Eng.

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Three dimensional laser beam steering has been demonstrated using a single optical devicea DMD micro-mirror array. Laser beam focus position is controlled using dynamically adjustable zone plates. These zone plates take the form of elliptical Fresnel zone plates or other variations such as binary Gabor zone plates. Active beam control can be realised without the need for a pair of galvanometer mirrors and a focusing lens. Writing multiple zone plate patterns to the DMD enables multiple focussed spots to be generated and controlled independently.

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Section: Binary Gabor Zone Platesmentioning

confidence: 99%

Multiple beam steering using dynamic zone plates on a micromirror array

Benton

2018

Opt. Eng.

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“…The concept of binary Gabor zone plate [3] is to produce an amplitude transmission function in correspondence with Eq. (1) in a binary form by changing it azimuthally as well as radially.…”

Section: Binary Gabor Zone Platementioning

confidence: 99%

“…This inevitably makes the multiple images produced from it tend to blur with each other. To overcome this problem and the difficulty of manufacture of an ideal Gabor zone plate, Beynon et al [3] suggested an alternative way to produce a Gabor zone plate in a binary form. This gives a better reconstructed image.…”

Section: Introductionmentioning

confidence: 99%

<title>Binary Gabor zone plate encoded holography in mid- and far-infrared region</title>

Shen

Beynon

1999

SPIE Proceedings

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A new technique is developed to image infrared sources by holography using a binary Gabor zone plate. The hologram consists of superimposed shadows of the binary Gabor zone plate cast by infrared sources. The reconstruction is carried out by using Fast Fourier Transforms (FFT). The scaling produced by the zone plate encoded technique is indicated and a correction for this can be easily made using a computer. In this way, a true infrared image in three dimensions can be obtained.

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“…Although it is possible to vary the excitation continuously across a transducer surface by varied poling of the piezoelectric material [2], a simpler method is to control the presence or absence of one electrode spatially across the transducer face. In optics, it has been shown that a continuously variable transmittance or excitation can be approximated using only two excitation levels, so that over a small area the proportion of excitation is arbitrarily variable [3]. In this way a complicated excitation modulation can be applied to an inexpensive single element transducer by fine binary patterning of one electrode.…”

Section: Introductionmentioning

confidence: 99%

9C-4 Novel Method for Design and Fabrication of Single Piston Transducers for Extended Depth of Field

Owen

Walker

2007

2007 IEEE Ultrasonics Symposium Proceedings

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Traditional focused transducers use multiple elements with individual delays, or a single element and lens to achieve focusing. These approaches involve significant cost, or acoustic losses respectively, and are not well suited to low-cost applications, for example disposable transducers. In contrast, zone plate transducers use the diffraction pattern formed by a variable excitation over the surface of a single element to achieve focusing. Although this results in an inexpensive focused transducer, the focusing performance degrades with broadband excitation, and contrast is limited. Additionally it is difficult to produce diffraction patterns with an extended focal zone. We have developed a successive projection algorithm to optimize the transducer pattern to overcome these limitations and meet desired focusing properties at several frequencies and ranges simultaneously. Within diffraction limits, this technique is shown to significantly outperform conventional zone plate transducers, in some cases reducing sidelobes by as much as 20dB. Furthermore we show that the necessary transducer patterns can be produced using off-the-shelf PCB technology, and that within the limitations of our fabrication process, we are able to experimentally validate our algorithm.

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Gabor zone plate with binary transmittance values

Cited by 42 publications

References 8 publications

Multiple beam steering using dynamic zone plates on a micromirror array

Multiple beam steering using dynamic zone plates on a micromirror array

<title>Binary Gabor zone plate encoded holography in mid- and far-infrared region</title>

9C-4 Novel Method for Design and Fabrication of Single Piston Transducers for Extended Depth of Field

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