Mueller matrix-based optimization of reflective type twisted nematic liquid crystal SLM at oblique incidences

Verma, Ram S.; Swami, M. K.; Manhas, Sandeep; Gupta, P. K.

doi:10.1016/j.optcom.2010.02.032

Cited by 8 publications

(4 citation statements)

References 23 publications

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“…For inverse calculation, the determinant of W must be nonzero implying the orientation angles of the QWP are to be optimized such that the determinant of W is maximum. The optimum values for the orientation angles of the QWP with respect to the transmission axis of the input polarizers are determined, in various reports, to be 35 [22,23]. For QWP, γ = 90 • .…”

Section: Spectral MM Measurementsmentioning

confidence: 99%

Stokes–Mueller formalism of spectrally-resolved transmitted light in an artificial opal

Sahani

Vijaya

2021

J. Opt.

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The response of an artificial opal to different polarization states of incident light is quantitatively analyzed by performing Mueller matrix (MM) polarimetry measurements in the transmission geometry. In addition, the wavelength-resolved polarization effects of the transmitted light from the opal are quantitatively investigated especially for the wavelengths lying inside the stop band, at the band edge, outside the stop band and far-outside the stop band. It is observed that the degree of polarization (DOP) of the transmitted light effectively decreases from unity and the polarized component in the transmitted light evolves from linear to slightly elliptical polarization when the wavelength of the linearly polarized incident light goes from inside to outside the stop band. On the other hand, only a small variation in the DOP is observed for circularly polarized incident light with the polarized component in the transmitted light nearly preserving its right-handed circular character. For comparison, the measurement is also done on a solution sample containing monodispersed colloids of the same size. The optical performance of the opal is characterized by calculating the linear, 45° linear, and circular diattenuation parameters from the measured MM elements. For the sake of completeness, the diattenuation parameters of the opal are calculated from the corresponding MM elements for oblique angles of incidence when the incident wavelength falls within the stop band. The same parameters are also quantified from the polarization- and angle-resolved transmission spectral measurements using a spectrophotometer and the one-to-one comparison between the parameters reveals an excellent agreement between the two measurements.

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Section: Spectral MM Measurementsmentioning

confidence: 99%

Stokes–Mueller formalism of spectrally-resolved transmitted light in an artificial opal

Sahani

Vijaya

2021

J. Opt.

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“…Generally, serious image distortion emerges at large oblique viewing angles, which leads to the inconsistent grayscale and color display under oblique viewing angles [35][36][37]. Actually, the gamma shift phenomenon occurs not just in IPS-BPLCD, but in other LCD modes and many optics fields, such as spatial light modulators [38,39], photonic crystals [40], smart dimming windows [41], and so on. Some designs were proposed to eliminate gamma shift, such as special optical structures [42], main/sub-pixel electrodes [43,44] and multi-domain electrodes [45][46][47][48][49][50].…”

Section: Introductionmentioning

confidence: 99%

Reduced off-axis gamma shift of liquid crystal display by intercepting transmittance method

Guo

et al. 2020

J. Phys. D: Appl. Phys.

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Generally, the brightness and color of one image on a large-area flat panel display are different when people watch a display image under different viewing angles. The gamma shift is used to evaluate the difference of electro-optical performances under different viewing angles, namely the gray-scale display distortion. In order to reduce the gamma shift under the oblique viewing angle, the intercepting transmittance method is proposed and illustrated based on the single-domain in-plane switching blue-phase liquid crystal display (IPS-BPLCD). The results show that the off-axis image distortion index (the quantitative evaluation index of gamma shift) can be reduced by ~72% if the transmittance ratio reduces from 100% to 80% for the IPS-BPLCD with a straight electrode structure. Moreover, the zigzag electrode structure is used as the reference to illustrate the merits of the proposed method. As a result, the operating voltage of the IPS-BPLCD can be reduced by >20%, and the off-axis image distortion index is reduced by ~47% compared with the zigzag electrode structure. Besides this, the effects of the proposed method on contrast ratio, operating voltage and color difference of IPS-BPLCD are investigated as well. In fact, the proposed method is also useful for other LCD modes and electro-optical devices to achieve wide and uniform viewing angles.

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“…11 Thus, establishing a relationship between mesogenic structure and the magnitude of the polarizability, anisotropy in trimethylsilyl mesogens is very crucial both for regulating and optimization of optical properties. [12][13][14][15] Our laboratory is involved in the synthesis, study of reactions and application of organosilyl based compounds. 16 In continuation of our studies, we were further interested in the synthesis and examination of compounds which possess mesogenic properties as well as single crystal properties.…”

Section: Introductionmentioning

confidence: 99%

Liquid/Single Crystal Structure Analysis: Synthesis and Characterization of a Trimethylsilyl Derived Rod Shaped Mesogen

Suresh¹,

Thimmaiah²,

Siddagangappa³

et al. 2015

ACSi

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4-[4'-Cyanophenoxy-carbonyl-phenyl-4-(trimethylsilyl)ethynyl]benzoate a rod shaped liquid crystal (SmA) is synthesized and characterized. The single-crystals were grown in triclinic crystal system in the space group of Pıwith unit cell parameters a = 5.9577(2) Å, b = 8.0398(3) Å, c = 25.8842(9) Å, α = 86.096(2) o , β = 89.912(2) o , γ = 2.919(2) o , Z = 2, and V = 1182.16(7). The crystal structure is stabilized by C-H•••O intra-molecular interactions. Further, the structure also involves C-H•••π interactions and weak π-π stacking interactions [centroid-centroid separation = 3.806 (3) Å].

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Mueller matrix-based optimization of reflective type twisted nematic liquid crystal SLM at oblique incidences

Cited by 8 publications

References 23 publications

Stokes–Mueller formalism of spectrally-resolved transmitted light in an artificial opal

Stokes–Mueller formalism of spectrally-resolved transmitted light in an artificial opal

Reduced off-axis gamma shift of liquid crystal display by intercepting transmittance method

Liquid/Single Crystal Structure Analysis: Synthesis and Characterization of a Trimethylsilyl Derived Rod Shaped Mesogen

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