Fast-response and high-efficiency optical switch based on dual-frequency liquid crystal polarization grating

Duan, Wei; Chen, Peng; Wei, Bingyan; Ge, Shi‐Jun; Liang, Xiao; Hu, Wei; Lu, Yanqing

doi:10.1364/ome.6.000597

Cited by 41 publications

(22 citation statements)

References 38 publications

(40 reference statements)

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“…The effect is mainly caused by the quenching of director fluctuations in the electric field that is applied parallel to the director. The field-induced birefringence in the range 0.01-0.04 is produced by electric fields on the order of 7 10 V/μm . The described MEMOP effect yields the FoM one or two orders of magnitude higher than the conventional Frederiks effect.…”

Section: Discussionmentioning

confidence: 99%

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Microsecond Electro-Optic Switching of Nematic Liquid Crystals with Giant Dielectric Anisotropy

Babakhanova

Xiao

et al. 2019

Phys. Rev. Applied

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Nematic liquid crystals exhibit a fast optical response when the applied electric field modifies the degree of order but does not change the direction of molecular orientation. The effect requires a relatively high electric field, on the order of 10 8 V/m for a field induced birefringence change of 0.01. To address this detrimental issue, this work explores electrically induced modification of the order parameter in a material with a giant dielectric anisotropy of +200. A relatively weak field 7 3 10  V/m causes a significant change of birefringence, by about 0.04. Both switching on and off times are ~10 µs. The effect is called a microsecond electrically modified order parameter (MEMOP) and can be used in electro-optical devices, such as fast electro-optic shutters, phase modulators, and beam-steerers that require microsecond response times.

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Section: Discussionmentioning

confidence: 99%

“…, one can achieve a significant birefringence change of 0.04 at the applied field 7 3 10  V/m with the switching times on the order of 10 µs for both field-on and -off switching. We call the effect a microsecond electrically modified order parameter, or MEMOP.…”

mentioning

confidence: 99%

Microsecond Electro-Optic Switching of Nematic Liquid Crystals with Giant Dielectric Anisotropy

Babakhanova

Xiao

et al. 2019

Phys. Rev. Applied

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“…[1][2][3]. К настоящему времени предложен широкий класс функциональных ТГц-устройств, включая фильтры, фазовращатели, поглотители, модуляторы и переключатели [4][5][6][7][8][9][10], среди которых последние два видятся наиболее важными для разви- тия систем связи и визуализации, востребованных в том числе для решения задач безопасности и противодействия терроризму [11][12][13]. В основе работы ТГц-модулятора может лежать температурное, оптическое или механическое переключение, а также управление под действием внешнего электрического поля [14][15][16][17].…”

Section: аннотацияunclassified

Application of the Concept of Ultra-Thin Resonant Absorbers for Controlling Millimeter-Wave Radiation by Means of Liquid Crystals

Kuznetsov

Николаев

Trashkeev

et al. 2019

SJPhys

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A consideration of ultra-thin resonant absorbers of electromagnetic radiation utilizing high-impedance metasurfaces is carried out in terms of an equivalent circuit theory. By incorporating a thin layer of tunable dielectric into such structures it is feasible to manipulate the radiation amplitude and phase under the condition of a small thickness of the dielectric layer in comparison with the radiation wavelength. As such a dielectric, the nematic liquid crystal 5CB with a thickness of 80 um was chosen, and a 5CB-based prototype of an absorbing metastructure of the reflective type optimized for operation in the vicinity of a frequency of 140 GHz was fabricated and experimentally studied. Testing the structure revealed good agreement between the calculated and experimental reflection spectra. The results of this work can be useful for modeling and developing quasi-optical and integrated active devices of terahertz photonics.

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“…Here, a polarization lens based on DFLC is demonstrated by introducing a PB phase [16], which can greatly improve the experimental diffractive efficiency up to 95%. The designed PB lens is an inhomogeneous LC wave plate, in which optical axis distribution is dependent on the designed focal length (F) and the free space wavelength (λ).…”

Section: Introductionmentioning

confidence: 99%

A Fast-Response and Helicity-Dependent Lens Enabled by Micro-Patterned Dual-Frequency Liquid Crystals

Duan

Chen

et al. 2019

Crystals

Self Cite

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Liquid crystals are excellent candidates for tunable optical elements due to their large birefringence and continuous tunability by external fields. A dual-frequency liquid crystal lens integrated with Pancharatnam–Berry phase was fabricated via a dynamic photo-patterning technique. The proposed lens exhibited distinctive polarization-dependent characteristics and ultra-high efficiency rates of up to 95%. Via merely alternating the frequency of the applied electric field, the switching time between unfocused and focused states was measured in submilliseconds. This work supplies a new strategy for fast-response, high-efficiency and helicity-dependent lens with merits of easy fabrication and low power consumption.

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Fast-response and high-efficiency optical switch based on dual-frequency liquid crystal polarization grating

Cited by 41 publications

References 38 publications

Microsecond Electro-Optic Switching of Nematic Liquid Crystals with Giant Dielectric Anisotropy

Microsecond Electro-Optic Switching of Nematic Liquid Crystals with Giant Dielectric Anisotropy

Application of the Concept of Ultra-Thin Resonant Absorbers for Controlling Millimeter-Wave Radiation by Means of Liquid Crystals

A Fast-Response and Helicity-Dependent Lens Enabled by Micro-Patterned Dual-Frequency Liquid Crystals

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