Liquid crystal metasurfaces on micropatterned polymer substrates

Kasyanova, I. V.; Gorkunov, M. V.; Артемов, В. В.; Гейвандов, А. Р.; Mamonova, A. V.; Palto, S. P.

doi:10.1364/oe.26.020258

Cited by 30 publications

(24 citation statements)

References 31 publications

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“…The FIB patterning is controlled by digital templates, which prescribe the beam path within a raster consisting of up to 4096 × 3536 pixel 2 as well as the time spent by the beam on each pixel (the so-called dwell time). According to our previous comparative study [31], a relatively small dose of Ga + ions is sufficient for the required polymer transformation and we adopt here the same dwell time value of 150 μs.…”

Section: Resultsmentioning

confidence: 99%

“…4). The corresponding solution of the Laplace equation can be found in terms of the Fourier expansion similar to that in [31]:…”

Section: Resultsmentioning

confidence: 99%

“…Recently, we have reported on LC metasurfaces formed due to local transformation of polymer–LC anchoring from planar to vertical by focused ion beam (FIB) [31]. While the particular microscopic mechanism of this transformation is yet to be revealed, it is hard to underestimate the emerging application prospects.…”

Section: Introductionmentioning

confidence: 99%

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Precise local control of liquid crystal pretilt on polymer layers by focused ion beam nanopatterning

Gorkunov¹,

Kasyanova²,

Артемов³

et al. 2019

Beilstein J. Nanotechnol.

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Background: The alignment of liquid crystals by surfaces is crucial for applications. It determines the director configuration in the bulk, its stability against defects and electro-optical switching scenarios. The conventional planar alignment of rubbed polymer layers can be locally flipped to vertical by irradiation with a focused ion beam on a scale of tens of nanometers. Results: We propose a digital method to precisely steer the liquid crystal director tilt at polymer surfaces by combining micrometer-size areas treated with focused ion beam and pristine areas. The liquid crystal tends to average the competing vertical and planar alignment actions and is stabilized with an intermediate pretilt angle determined by the local pattern duty factor. In particular, we create micrometer-sized periodic stripe patterns with this factor gradually varying from 0 to 1. Our optical studies confirm a predictable alignment of a nematic liquid crystal with the pretilt angle continuously changing from 0° to 90°. A one-constant model neglecting the difference between the elastic moduli reproduces the results quantitatively correctly. Conclusion: The possibility of nanofabrication of polymer substrates supporting an arbitrary (from planar to vertical) spatially inhomogeneous liquid crystal alignment opens up prospects of “imprinting” electrically tunable versatile metasurfaces constituting lenses, prisms and q-plates.

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Section: Resultsmentioning

confidence: 99%

“…4). The corresponding solution of the Laplace equation can be found in terms of the Fourier expansion similar to that in [31]:…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Precise local control of liquid crystal pretilt on polymer layers by focused ion beam nanopatterning

Gorkunov¹,

Kasyanova²,

Артемов³

et al. 2019

Beilstein J. Nanotechnol.

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“…So far, several different tuning principles [ 58 , 59 , 60 , 61 , 62 ] based on various types of liquid crystal (LC) molecules, such as chiral [ 63 ], nematic [ 64 ], and smectic [ 65 ] characteristics have been experimentally demonstrated to realize dynamically controllable nanodevices. Since LC-based modulation mechanism can offer an additional advantage because the LC-molecules exhibit a large optical anisotropy [ 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 ], investigations on LCs combined with nanostructures [ 84 , 85 , 86 ] or two-dimensional materials [ 87 ] have recently drawn significant attention and interest. Developing tunable optical metamaterials by incorporating nematic LCs as an electro-optic or nonlinear optical constituent has become a popular research topic [ 88 , 89 , 90 , 91 , 92 , 93 ].…”

Section: Introductionmentioning

confidence: 99%

Liquid Crystal Enabled Dynamic Nanodevices

Meng

Liu

et al. 2018

Nanomaterials

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Inspired by the anisotropic molecular shape and tunable alignment of liquid crystals (LCs), investigations on hybrid nanodevices which combine LCs with plasmonic metasurfaces have received great attention recently. Since LCs possess unique electro-optical properties, developing novel dynamic optical components by incorporating nematic LCs with nanostructures offers a variety of practical applications. Owing to the large birefringence of LCs, the optical properties of metamaterials can be electrically or optically modulated over a wide range. In this review article, we show different elegant designs of metasurface based nanodevices integrated into LCs and explore the tuning factors of transmittance/extinction/scattering spectra. Moreover, we review and classify substantial tunable devices enabled by LC-plasmonic interactions. These dynamically tunable optoelectronic nanodevices and components are of extreme importance, since they can enable a significant range of applications, including ultra-fast switching, modulating, sensing, imaging, and waveguiding. By integrating LCs with two dimensional metasurfaces, one can manipulate electromagnetic waves at the nanoscale with dramatically reduced sizes. Owing to their special electro-optical properties, recent efforts have demonstrated that more accurate manipulation of LC-displays can be engineered by precisely controlling the alignment of LCs inside small channels. In particular, device performance can be significantly improved by optimizing geometries and the surrounding environmental parameters.

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“…Они широко применяются как перспективные элементы органической наноэлектроники, OLED, сенсоров и фотовольтаики [1][2][3]. Чрезвычайно интересными соединениями, формирующими конденсированные фазы, являются жидкие кристаллы [4][5][6][7]. Они сочетают в себе комбинацию таких свойств, как подвижность и текучесть с дальним позиционным порядком.…”

Section: Introductionunclassified

Self-Organization of Azo Dye KD-2 in Floating Layers and Langmuir – Schaefer Films

Kazak¹,

Zhukova²,

Kovaleva³

et al. 2018

Liq. Cryst. and their Appl.

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С целью формирования ориентированных слоев мезогенов получены плавающие слои и пленки Ленгмюра-Шеффера азокрасителя КД-2. Построена модель монослоевой упаковки исследуемого соединения на воде и рассчитаны геометрические характеристики данной упаковки. Установлено, что площадь, приходящаяся на одну молекулу в плотнейшем монослое, равна 0,96 нм 2 (А мол = 0,96 нм 2). Изучены спектральные характеристики перенесенных пленок. Показано, что в конденсированной фазе (пленки Ленгмюра-Шеффера) происходят смещение максимума полосы поглощения в длинноволновую область и значительное ее уширение, что мы объясняем агрегированием молекул соединения в данных пленках. Ключевые слова: азокраситель, модель, плавающие слои, пленки Ленгмюра-Шеффера, оптические свойства.

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Liquid crystal metasurfaces on micropatterned polymer substrates

Cited by 30 publications

References 31 publications

Precise local control of liquid crystal pretilt on polymer layers by focused ion beam nanopatterning

Precise local control of liquid crystal pretilt on polymer layers by focused ion beam nanopatterning

Liquid Crystal Enabled Dynamic Nanodevices

Self-Organization of Azo Dye KD-2 in Floating Layers and Langmuir – Schaefer Films

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