Simple holographic projection in color

Makowski, Michał; Ducin, Izabela; Kakarenko, Karol; Suszek, Jarosław; Sypek, Maciej; Kołodziejczyk, Andrzej

doi:10.1364/oe.20.025130

Cited by 132 publications

(63 citation statements)

References 12 publications

(21 reference statements)

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“…Two simple approaches are to divide the aperture into separate regions for each frequency or to exploit the chromatic variation in focal length of Fresnel kinoforms that occurs due to the wavelength dependence of the phase offsets from free-space propagation [3,4]. Other works have used optimisation methods that search for a thickness at each position by maximising a quality metric based on the target field for each frequency.…”

Section: Multi-frequency Kinoformsmentioning

confidence: 99%

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Investigating the effect of thickness and frequency spacing on multi-frequency acoustic kinoforms

Brown

Cox

Treeby

2017

2017 IEEE International Ultrasonics Symposium (IUS)

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Abstract-The generation of complex diffraction limited acoustic fields from a simple planar transducer is possible using cheap 3-D printable kinoforms. This approach is extremely promising for several areas of physical acoustics. However, one drawback is that the acoustic field generated from a given kinoform is fixed, limiting flexibility. In this work, multi-frequency acoustic kinoforms are investigated as a means to circumvent that limitation. These are kinoforms designed to generate different distributions of pressure at a target depth when driven at particular design frequencies. An optimisation approach based on direct search for the design of these structures from a set of input frequencies and target distributions is briefly described. The effect of different parameters of the kinoform on the performance are then established. These include the maximum thickness, frequency spacing and target depth. It is found that the maximum thickness has to be limited to avoid significant aberrations, the frequency spacing should be maximised within the usable bandwidth of the transducer, and the optimal thickness is influenced by the choice of target depth. The thin phase approximation is also shown to be increasingly inaccurate for increasing element thicknesses.

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Section: Multi-frequency Kinoformsmentioning

confidence: 99%

“…However, one drawback is the fixed nature of the acoustic field generated by each kinoform, which limits flexibility. A way to overcome this is to adapt a technique from optical holography [3] and encode several target acoustic distributions onto the same kinoform for…”

Section: Introductionmentioning

confidence: 99%

Investigating the effect of thickness and frequency spacing on multi-frequency acoustic kinoforms

Brown

Cox

Treeby

2017

2017 IEEE International Ultrasonics Symposium (IUS)

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“…In 2003, Huebschman et al [5] have successfully used digital micro-mirror device (DMD) as the display engine to project dynamic 3D images. In recent years, various techniques have been developed for holographic 3D projection based on liquid crystal SLM (LC-SLM) [6][7][8][9]. However, the holographic images are projected on a plate or carried by CCD cameras in these systems.…”

Section: Introductionmentioning

confidence: 99%

Dynamic holographic three-dimensional projection based on liquid crystal spatial light modulator and cylindrical fog screen

Zeng

Zheng

et al. 2015

Opt Rev

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A dynamic holographic three-dimensional (3D) projection based on phase-only liquid crystal spatial light modulator (LC-SLM) and cylindrical fog 3D screen is introduced. Sequential kinoforms of a 3D real existing object are calculated from sixty viewing angles using the slice-based fresnel diffraction algorithm. To suppress speckle noise of reconstructed images, sub-kinoforms for each viewing angle are calculated by adding dynamic pseudorandom initial phase factor into each object plane. The sequential kinoforms are reconstructed by a holographic reconstruction system based on phase-only LC-SLM. A specially designed cylindrical fog 3D screen is used as the scattered carrying medium to project the dynamic 3D images. Through our holographic 3D projection system, a vivid dynamic holographic reconstructed projection image can be observed by some observers at the same time.

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“…4 In the former, the aperture of the kinoform is sub-divided into separate regions for each frequency. 5 For the latter, a kinoform is calculated for a single frequency with target images at different depths using a multi-plane iterative Fourier transform algorithm (IFTA). The focal distance of kinoforms in the nearfield scales inversely with wavelength, so different patterns are shifted into the target plane as the frequency is changed.…”

mentioning

confidence: 99%

Design of multi-frequency acoustic kinoforms

Brown

Cox

Treeby

2017

Applied Physics Letters

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Complex diffraction limited acoustic fields can be generated from a single element transducer using inexpensive 3-D printable acoustic kinoforms. This is extremely promising for a number of applications. However, the lack of ability to vary the field limits the potential use of this technology. In this work, this limitation is circumvented using multi-frequency acoustic kinoforms for which different acoustic fields are encoded onto different driving frequencies. An optimisation approach based on random downhill binary search is introduced for the design of the multi-frequency kinoforms. This is applied to two test cases to demonstrate the technique: a kinoform designed to generate the numerals “1,” “2,” and “3” in the same plane but at different driving frequencies, and a kinoform designed to generate 3 sets of eight foci lying on a circle with a driving-frequency-dependent radius. Field measurements from these samples confirmed that multi-frequency acoustic kinoforms can be designed that switch between different arbitrary, pre-designed, acoustic field patterns in the target plane by changing the driving frequency.

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Simple holographic projection in color

Cited by 132 publications

References 12 publications

Investigating the effect of thickness and frequency spacing on multi-frequency acoustic kinoforms

Investigating the effect of thickness and frequency spacing on multi-frequency acoustic kinoforms

Dynamic holographic three-dimensional projection based on liquid crystal spatial light modulator and cylindrical fog screen

Design of multi-frequency acoustic kinoforms

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