Wavelength-compensated color Fourier diffractive optical elements using a ferroelectric liquid crystal on silicon display and a color-filter wheel

Martínez, José Luis; Martínez-García, Antonio; Moreno, Ignacio

doi:10.1364/ao.48.000911

Cited by 30 publications

(27 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…By formula (11), it is easy to know the recording distance of the three colors is d R < d G < d B . Though it is simple to operate when simulating with computer due to the number of sampling points on each color component is equal, it still needs precise regulating instrument to adjust the distance in the real photoelectric reconstruction experiment, which not only increases the complexity of the optical path, but also increases the experiment task.…”

Section: Making Color Computer Generated Hologrammentioning

confidence: 99%

“…(2) Adjust the total pixels. When the recording distance of each color component remains the same, we know from formula that (11):…”

Section: Making Color Computer Generated Hologrammentioning

confidence: 99%

“…So due to the "spectrum aliasing" effect, DBFT algorithm under normal circumstances cannot reconstruct high-quality object-light field. In 2009, Martinez JL et al [11] put forward a method to eliminate the color difference through compressing the hologram according to the wavelength, but it is at the expense of losing the high frequency part of the red and green information. In 2004, Pietro Ferraro et al [12] came up with another method, i.e., changing the parameters such as wavelength, etc.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Research on true color computer generated hologram by lensless Fourier transform

Zhang¹,

Wang²,

Yang³

et al. 2014

Optik

View full text Add to dashboard Cite

Section: Making Color Computer Generated Hologrammentioning

confidence: 99%

“…(2) Adjust the total pixels. When the recording distance of each color component remains the same, we know from formula that (11):…”

Section: Making Color Computer Generated Hologrammentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Research on true color computer generated hologram by lensless Fourier transform

Zhang¹,

Wang²,

Yang³

et al. 2014

Optik

View full text Add to dashboard Cite

“…[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. This device used the dynamic scattering electro-optic effect, which is difficult to drive from an active backplane as it is driven by an electric current by the nature of the effect and, therefore, is not capable of phase modulation because dynamic scattering devices work by passing an electric current through an ionically doped LC, and the LC conducts electricity.…”

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

“…In a 2f configuration, the additional phase aberrations would degrade the point spread function in the spatial Fourier plane. Nevertheless, these shortcomings have not prevented researchers from using LCoS devices for computer generated holography accepting compromises in the fidelity achieved [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Matched-filtering generalized phase contrast using LCoS pico-projectors for beam-forming

Bañas¹,

Palima²,

Glückstad³

2012

Opt. Express

View full text Add to dashboard Cite

Abstract:We report on a new beam-forming system for generating high intensity programmable optical spikes using so-called matched-filtering Generalized Phase Contrast (mGPC) applying two consumer handheld picoprojectors. Such a system presents a low-cost alternative for optical trapping and manipulation, optical lattices and other beam-shaping applications usually implemented with high-end spatial light modulators. Portable picoprojectors based on liquid crystal on silicon (LCoS) devices are used as binary phase-only spatial light modulators by carefully setting the appropriate polarization of the laser illumination. The devices are subsequently placed into the object and Fourier plane of a standard 4f-setup according to the mGPC spatial filtering configuration. Having a reconfigurable spatial phase filter, instead of a fixed and fabricated one, allows the beam shaper to adapt to different input phase patterns suited for different requirements. Despite imperfections in these consumer picoprojectors, the mGPC approach tolerates phase aberrations that would have otherwise been hard to overcome by standard phase projection.

show abstract

Wavelength-compensated color Fourier diffractive optical elements using a ferroelectric liquid crystal on silicon display and a color-filter wheel

Cited by 30 publications

References 23 publications

Research on true color computer generated hologram by lensless Fourier transform

Research on true color computer generated hologram by lensless Fourier transform

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

Matched-filtering generalized phase contrast using LCoS pico-projectors for beam-forming

Contact Info

Product

Resources

About