V‐shaped electro‐optical mode based on deformed‐helix ferroelectric liquid crystal with subwavelength pitch

Pozhidaev, E. P.; Chigrinov, Vladimir G.; Murauski, Anatoli; Molkin, Vadim; Du, Tao; Kwok, Hoi‐Sing

doi:10.1889/jsid20.5.273

Cited by 24 publications

(15 citation statements)

References 35 publications

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“…In addition, the typical response time of the DHFLC modulator based on FLC-587 is known to be around 100 µs at the phase shift equal to π [17]. So, it might be concluded that all essential prerequisites are in place for elaboration of the DHFLC spatial light modulator operating almost as the ideal axicon at the phase modulation frequency about 1 kHz.…”

Section: Discussionmentioning

confidence: 99%

“…In short-pitch DHFLC cells, the FLC helix is characterized by a submicron helix pitch, P < 1 µm, and a relatively large tilt angle, θ > 30 • . Electro-optical response of DHFLC cells exhibits a number of peculiarities that make them useful for LC devices such as high speed spatial light modulators [12][13][14][15][16], colour-sequential liquid crystal display cells [17] and optic fiber sensors [18,19]. The effects caused by electric-field-induced distortions of the helical structure underline the mode of operation of such cells.…”

Section: Introductionmentioning

confidence: 99%

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Light modulation in planar aligned short-pitch deformed-helix ferroelectric liquid crystals

Котова¹,

Samagin²,

Pozhidaev³

et al. 2015

Phys. Rev. E

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We study both experimentally and theoretically modulation of light in a planar aligned deformedhelix ferroelectric liquid crystal (DHFLC) cell with subwavelength helix pitch, which is also known as a short-pitch DHFLC. In our experiments, azimuthal angle of the in-plane optical axis and electrically controlled parts of the principal in-plane refractive indices were measured as a function of voltage applied across the cell. Theoretical results giving the effective optical tensor of a shortpitch DHFLC expressed in terms of the smectic tilt angle and the refractive indices of FLC are used to fit the experimental data. Optical anisotropy of the FLC material is found to be weakly biaxial. For both the transmissive and reflective modes, the results of fitting are applied to model phase and amplitude modulation of light in the DHFLC cell. We demonstrate that, if the thickness of the DHFLC layer is about 50 µm, the detrimental effect of field-induced rotation of the in-plane optical axes on the characteristics of an axicon designed using the DHFLC spatial light modulator in the reflective mode is negligible.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Light modulation in planar aligned short-pitch deformed-helix ferroelectric liquid crystals

Котова¹,

Samagin²,

Pozhidaev³

et al. 2015

Phys. Rev. E

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“…Although PSBPLCs have been recently considered as an emerging display and phase modulating technology, the VADHFLC mode seems to have the advantage of higher Kerr constant supplemented with faster (around an order of magnitude) electro-optical response. Under certain conditions, the EO response of DHFLC cells can also be made hysteresis free [43]. Therefore, VADHFLCs could be used in many modern electro-optical devices.…”

Section: -5mentioning

confidence: 99%

Orientational Kerr effect and phase modulation of light in deformed-helix ferroelectric liquid crystals with subwavelength pitch

et al. 2013

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We study both theoretically and experimentally the electro-optical properties of vertically aligned deformed helix ferroelectric liquid crystals (VADHFLC) with subwavelength pitch that are governed by the electrically induced optical biaxiality of the smectic helical structure. The key theoretical result is that the principal refractive indices of homogenized VADHFLC cells exhibit the quadratic nonlinearity and such behavior might be interpreted as an orientational Kerr effect caused by the electric-field-induced orientational distortions of the FLC helix. In our experiments, it has been observed that, for sufficiently weak electric fields, the magnitude of biaxiality is proportional to the square of electric field in good agreement with our theoretical results for the effective dielectric tensor of VADHFLCs. Under certain conditions, the 2π phase modulation of light, which is caused by one of the induced refractive indices, is observed without changes in ellipticity of incident light.

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“…[7,8] For the latter function, what is as the Step one symmetric in time with zero average; see Figure 1(a). According to our knowledge, it has not yet been done a study on Δn E behaviour of DHF chiral smectic C* cells subjected to a STAIR driving voltage, but this investigation is important from both application and fundamental point of view.…”

Section: Introductionmentioning

confidence: 99%

The quadratic electro-optical effect in ferroelectric liquid crystal helical nanostructures: role of the driving voltage shape

et al. 2015

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2015): The quadratic electro-optical effect in ferroelectric liquid crystal helical nanostructures: role of the driving voltage shape, Liquid Crystals,Recently it was shown that in deformed helix ferroelectric (DHF) structure, the electrically controlled birefringence Δn E of chiral smectic C* phase with subwavelength helix pitch (Δn E is known to be proportional to the square of the electric field E) depends on the cell thickness and on the frequency of applied voltage, given as a Step function of the time. The purpose of the present work is to investigate whether this quadratic effect depends also on the voltage function shape, comparing the electrically controlled birefringence Δn E and the Kerr constant in DHF cells with different thickness, driven by STAIR and Step voltage functions.

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V‐shaped electro‐optical mode based on deformed‐helix ferroelectric liquid crystal with subwavelength pitch

Cited by 24 publications

References 35 publications

Light modulation in planar aligned short-pitch deformed-helix ferroelectric liquid crystals

Light modulation in planar aligned short-pitch deformed-helix ferroelectric liquid crystals

Orientational Kerr effect and phase modulation of light in deformed-helix ferroelectric liquid crystals with subwavelength pitch

The quadratic electro-optical effect in ferroelectric liquid crystal helical nanostructures: role of the driving voltage shape

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