Phase modulation with the next generation of liquid crystal over silicon technology

Wilkinson, Timothy D.; Henderson, C. D.; Leyva, D. Gil; Crossland, W. A.

doi:10.1039/b602296k

Cited by 22 publications

(10 citation statements)

References 13 publications

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“…On the other hand, the rotation effect can be enhanced at the cost of having a larger device, by stacking several films: a summed rotation effect would result, since the films do not require alignment of polarization for operation. They can also be addressed by an active matrix using the liquid crystal on silicon (LCOS) technology, this would result in a spatial light modulator that can generate beams with active polarization patterns.…”

Section: Fabrication and Application Of The Nanocompositesmentioning

confidence: 99%

Deformation‐Free, Microsecond Electro‐Optic Tuning of Liquid Crystals

Inoue

Yoshida

Kubo

et al. 2013

Advanced Optical Materials

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Fast (~10 μ s) and deformation-free electro-optic tuning of a liquid crystal is reported, achieved by macroscopic alignment and switching of nanosized, pseudo-nematic domains. The tuning mode can be achieved by photopolymerizing a mesogenic monomer-liquid crystal mixture in the liquid crystal phase, and forming nanosized pores in the polymer matrix. This concept is particularly effective in liquid crystals with spontaneous structure-forming capabilities: here this concept is applied to a cholesteric liquid crystal and demonstrate scatter-free tuning of the Bragg refl ection band. It can also lead to new device applications such as thin-fi lm optical amplitude modulators and linear polarization rotators . 257

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Section: Fabrication and Application Of The Nanocompositesmentioning

confidence: 99%

Deformation‐Free, Microsecond Electro‐Optic Tuning of Liquid Crystals

Inoue

Yoshida

Kubo

et al. 2013

Advanced Optical Materials

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“…Liquid crystal over silicon (LCoS) devices are a mature technology in the microdisplay market, offering various advantages over other technologies such as micromirrors [1,[3][4][5]. The main limitation with LCoS devices to date has been the response time of the liquid crystal, especially if gray-scale modulation is required.…”

Section: Introductionmentioning

confidence: 99%

Polarization-independent phase modulation using a blue-phase liquid crystal over silicon device

et al. 2014

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Liquid crystal over silicon (LCoS) spatial light modulator technology has become dominant in industries such as pico-projection, which require high-quality reflective microdisplays for intensity modulation of light. They are, however, restricted from being used in wider optical applications, such as computer-generated holography, adaptive optics, and optical correlation, due to their phase modulation ability. The main drawback of these devices is that their modulation is based on simple planar or twisted nematic liquid crystals, which are inherently slow mechanisms due to their viscoelastic properties. Their use is also limited due to fact that the phase modulation is dependent on the state of polarization of the illumination. In this paper, we demonstrate that a polymer-stabilized blue-phase liquid crystal can offer both phase modulation and high speed switching in a silicon backplane device which is independent of the input polarization state. The LCoS device shows continuous phase modulation of light with a submillisecond switching time and insensitivity to the input light polarization direction. This type of phase modulation opens up a whole new class of applications for LCoS technology.

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“…By employing silicon very-large-scale integration technology and complementary metal oxide semiconductor (CMOS) circuitry, complex functionality can be realized by using a silicon backplane with the associated scalability of pixel size and active area. Contemporary LCOS devices can be constructed to manipulate optical signals through phase-only modulation [9,10] rather than the traditional amplitude modulation [11,12]. Phase-only LCOS devices operate in reflective mode, and they have a sandwich-like structure with the high birefringence liquid crystal (LC) material placed between a glass substrate and a silicon backplane.…”

Section: Introductionmentioning

confidence: 99%

Diffraction based phase compensation method for phase-only liquid crystal on silicon devices in operation

et al. 2012

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A method to measure the optical response across the surface of a phase-only liquid crystal on silicon device using binary phase gratings is described together with a procedure to compensate its spatial optical phase variation. As a result, the residual power between zero and the minima of the first diffraction order for a binary grating can be reduced by more than 10 dB, from -15.98 dB to -26.29 dB. This phase compensation method is also shown to be useful in nonbinary cases. A reduction in the worst crosstalk by 5.32 dB can be achieved when quantized blazed gratings are used.

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Phase modulation with the next generation of liquid crystal over silicon technology

Cited by 22 publications

References 13 publications

Deformation‐Free, Microsecond Electro‐Optic Tuning of Liquid Crystals

Deformation‐Free, Microsecond Electro‐Optic Tuning of Liquid Crystals

Polarization-independent phase modulation using a blue-phase liquid crystal over silicon device

Diffraction based phase compensation method for phase-only liquid crystal on silicon devices in operation

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