Phase-only modulation with twisted nematic liquid-crystal spatial light modulators

Konforti, Naim; Marom, Emanuel; Wu, Shin‐Tson

doi:10.1364/ol.13.000251

Cited by 206 publications

(64 citation statements)

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“…However, no amplitude modulation is expected in this regime because the TN cell remains uniform and the wave guiding effect still exists. 22 In addition, a smoother transition of the transmittance was achieved, as shown in Fig. 9.…”

Section: B Experimental Resultsmentioning

confidence: 76%

Liquid crystal device with 50 nm nanogroove structure fabricated by nanoimprint lithography

Takahashi

Sakamoto

Okada

2010

Journal of Applied Physics

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We have investigated the alignment of nematic liquid crystals (NLCs) using 50 nm ultrafine nanogrooves fabricated by electron-beam (EB) lithography and nanoimprint lithography. To improve the wettability of NLCs, silicon dioxide was sputtered onto the NLCs after nanogroove fabrication. The azimuthal and polar anchoring energies obtained were 9.4×10−5 J/m2 and 3.6×10−4 J/m2, respectively. From the electro-optical characteristic of a twisted nematic (TN) liquid crystal (LC) cell, the contrast ratio of the TN cell was found to be 44:1, which is a relatively low value because of the misalignment of the EB exposure. However, a steeper and common threshold voltage was obtained for the TN LC cell.

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Section: B Experimental Resultsmentioning

confidence: 76%

Liquid crystal device with 50 nm nanogroove structure fabricated by nanoimprint lithography

Takahashi

Sakamoto

Okada

2010

Journal of Applied Physics

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“…For many interesting applications of LC technology, an accurate characterization of the device to control the optical modulation as a function of the wavelength is necessary, especially in those applications that are making use of the phase modulation [16]. This is the case of Fourier transform spectroscopy [17,18], where LC devices offer a new design and unattended monitoring implementations instead of using moving parts components.…”

Section: Introductionmentioning

confidence: 99%

Accurate color predictability based on a spectral retardance model of a twisted-nematic liquid-crystal display

Martínez

García‐Martínez

Sánchez-López

2011

Optics Communications

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“…Some LC-SLMs are specifically designed for this task, as those composed by parallel aligned (PAL) nematic LC cells [4]. In contrast, off-the-shelf twisted nematic LC displays (TNLCDs) provide a coupled intensity and phase modulation, so they must previously undergo an optimization process [5][6][7]. In all cases, it is critical to perform an experimental determination of the spatial phase distribution of the SLM as a function of the parameter that controls the signal applied to the device (typically, the gray-level of the image displayed by commercial LC devices).…”

Section: Introductionmentioning

confidence: 99%

Phase calibration of spatial light modulators by means of Fresnel images

Martínez-León¹,

Jaroszewicz²,

Kołodziejczyk³

et al. 2009

J. Opt. A: Pure Appl. Opt.

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Reliable application of spatial light modulators (SLMs) as programmable diffractive optical elements requires a thorough calibration. In this paper, we propose a method for calibrating SLMs based on the evaluation of Fresnel images. Fresnel images generated by a binary phase diffraction grating consist of binary irradiance distributions whose visibility depends on the phase modulation. By displaying on our device a diffraction grating with a binary phase step along one direction and a linearly increasing phase along the orthogonal direction, we perform a complete phase calibration. In this way, the phase modulation for every pixel and for every value of the entrance signal can be determined experimentally.Additionally, data acquisition can be significantly simplified with this scheme.

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Phase-only modulation with twisted nematic liquid-crystal spatial light modulators

Cited by 206 publications

References 0 publications

Liquid crystal device with 50 nm nanogroove structure fabricated by nanoimprint lithography

Liquid crystal device with 50 nm nanogroove structure fabricated by nanoimprint lithography

Accurate color predictability based on a spectral retardance model of a twisted-nematic liquid-crystal display

Phase calibration of spatial light modulators by means of Fresnel images

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