Full-range, complex spatial light modulator for real-time holography

Reichelt, Stephan; Häussler, R.; Fütterer, Gerald; Leister, Norbert; Kato, Hiromi; Usukura, Naru; Kanbayashi, Yuuichi

doi:10.1364/ol.37.001955

Cited by 112 publications

(47 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As such, we change the scanning direction of each row of pixels so that the recursive process in Eq. (8), which leads to the correlated error, will be interrupted after each row is visited. The errors on the odd rows are diffused to the neighboring pixels in the same way as given in Eqs.…”

Section: ( )mentioning

confidence: 99%

“…Likewise, a complex hologram can be simulated with a double phase-only hologram [6], and displayed with a pair of phase-only SLMs. In some implementation, the pair of SLMs is replaced by a single device, displaying a pair of holograms and subsequently merging the reconstructed wavefront through a grating [7][8][9][10]. Although such approach is effective, the optical setups are rather complicated.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Novel method for converting digital Fresnel hologram to phase-only hologram based on bidirectional error diffusion

Tsang¹,

Poon²

2013

Opt. Express

148

View full text Add to dashboard Cite

Abstract:We report a novel and fast method for converting a digital, complex Fresnel hologram into a phase-only hologram. Briefly, the pixels in the complex hologram are scanned sequentially in a row by row manner. The odd and even rows are scanned from opposite directions, constituting to a bidirectional error diffusion process. The magnitude of each visited pixel is forced to be a constant value, while preserving the exact phase value. The resulting error is diffused to the neighboring pixels that have not been visited before. The resulting novel phase-only hologram is called the bidirectional error diffusion (BERD) hologram. The reconstructed image from the BERD hologram exhibits high fidelity as compared with those obtained with the original complex hologram.

show abstract

Section: ( )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel method for converting digital Fresnel hologram to phase-only hologram based on bidirectional error diffusion

Tsang¹,

Poon²

2013

Opt. Express

148

View full text Add to dashboard Cite

show abstract

“…Unlike amplitude-modulating LCOS devices (mainly for video and image projections), phase-only modulating LCOS devices have a wide range of applications based on the spatial modulation of coherent lights, [14][15][16] including real-time holography, 17 optical correlators, 18 wavelength selective switches, 19,20 reconfigurable optical add-drop multiplexers [20][21][22] and diffractive optical components. [23][24][25] The first attempt to drive an LC pixel array from a single crystal silicon active backplane was proposed by Ernstoff et al 26 in the early 1970s.…”

Section: Brief Introduction To Lcos Devicesmentioning

confidence: 99%

Fundamentals of phase-only liquid crystal on silicon (LCOS) devices

2014

View full text Add to dashboard Cite

This paper describes the fundamentals of phase-only liquid crystal on silicon (LCOS) technology, which have not been previously discussed in detail. This technology is widely utilized in high efficiency applications for real-time holography and diffractive optics. The paper begins with a brief introduction on the developmental trajectory of phase-only LCOS technology, followed by the correct selection of liquid crystal (LC) materials and corresponding electro-optic effects in such devices. Attention is focused on the essential requirements of the physical aspects of the LC layer as well as the indispensable parameters for the response time of the device. Furthermore, the basic functionalities embedded in the complementary metal oxide semiconductor (CMOS) silicon backplane for phase-only LCOS devices are illustrated, including two typical addressing schemes. Finally, the application of phase-only LCOS devices in real-time holography will be introduced in association with the use of cutting-edge computer-generated holograms. The architecture of LCOS devices is similar to conventional LC devices except that a silicon backplane constitutes one of the substrates (Figure 1). The silicon CMOS backplane consists of the electronic circuitry that is buried underneath pixel arrays to provide a high 'fill factor'. The pixels are aluminum mirrors deposited on the surface of the silicon backplane. The incident light is transmitted through the LC layer with almost zero absorption. The integration of high-performance driving circuitry allows the applied voltage to be changed on each pixel, thereby controlling the phase retardation of the incident wavefront across the device. Currently, there are two types of light modulation using LCOS devices, amplitude modulation and phase modulation. In the former case, the amplitude of the light signal is modulated 6,7 by varying the linear polarzation direction of the incident light passing through a linear polarizer, the same principle used in a standard LC television. In the latter case, the phase delay is accomplished by electrically adjusting the optical refractive index along the light path, which is possible because of the non-zero birefringence of the LC materials in use but should be carefully characterized. [8][9][10][11][12][13] In a phase-only LCOS SLM modulator, no light absorption by polarizers or other light-absorbing components will occur, such that the maximum light efficiency can be expected.Currently, most of the conventional LC devices are not able to efficiently modulate the phase of an incident wavefront. For instance, the LC device structure using thin film transistors is not suitable for phase modulation because an appropriate electro-optic effect has not been used (see the section on 'Twisted nematic (TN) configuration' and the section on 'VAN configuration' for details). Moreover, the pixels of this type of device are too large to provide acceptably large diffraction angles. In addition, the pixel circuitry and connection tracks are in the light path such that the ...

show abstract

“…By mathematically calculating the difference between the two sizes of the concentric rectangular areas in the SLM, we achieve a complex hologram, instead of just adjusting the accuracy of the pixel positions on the SLM, as in previous studies. In our system the optical setup is simple, and the system provides a higher intensity for each reconstructed object point than do previous systems [2][3][4][5][6][7][8][9][10][11][12][13]. Section II describes the proposed method with size variation of concentric rectangular areas for better reconstruction quality.…”

Section: Introductionmentioning

confidence: 99%

Quality Enhancement of a Complex Holographic Display Using a Single Spatial Light Modulator and a Circular Grating

Bang

Piao

Kim³

et al. 2016

Journal of the Optical Society of Korea

View full text Add to dashboard Cite

This paper proposes an optical system for complex holographic display that enhances the quality of the reconstructed three-dimensional image. This work focuses on a new design for an optical system and the evaluation of the complex holographic display, using a single spatial light modulator (SLM) and a circular grating. The optical system is based on a 4-f system in which the imaginary and real information of the hologram is displayed on concentric rectangular areas of the SLM and circular grating. Thus, this method overcomes the lack of accuracy in the pixel positions between two window holograms in previous studies, and achieves a higher intensity of the real object points of the reconstructed hologram than the original phase-reconstructed hologram. The proposed method provides approximately 30% less NMRS (Normal Root Mean Square) error, compared to previous systems, which is verified by both simulation and optical experiment.

show abstract

Full-range, complex spatial light modulator for real-time holography

Cited by 112 publications

References 15 publications

Novel method for converting digital Fresnel hologram to phase-only hologram based on bidirectional error diffusion

Novel method for converting digital Fresnel hologram to phase-only hologram based on bidirectional error diffusion

Fundamentals of phase-only liquid crystal on silicon (LCOS) devices

Quality Enhancement of a Complex Holographic Display Using a Single Spatial Light Modulator and a Circular Grating

Contact Info

Product

Resources

About