Formation of ring-shaped light fields with orbital angular momentum using a modal type liquid crystal spatial modulator

Котова, С. П.; Mayorova, A. M.; Samagin, S. A.

doi:10.1088/2040-8986/aab8bb

Cited by 14 publications

(9 citation statements)

References 21 publications

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“…Specifically, LC-tunable optical phase modulation is one of the most important uses, which has attracted significant attention for years 1 . Currently, it is a very researched topic, for example in ophthalmological applications 2 , 3D vision applications [3][4][5][6] , beam steering 7 , optical vortices [8][9][10][11] , tunable zooming 12 , aberration correctors 13 , astronomy 14 , novel aberration correctors 15 , multi-optical elements 16 , micro-axicon arrays 17 , multi-focal 18 , high fill-factor 19 and frequency controlled 20 microlenses, lensacons, and logarithmic axicons 21 , etc. High among those are adaptive-focus lenses, which were first proposed more than 40 years ago and still are a hot topic.…”

Section: In This Work a Novel Technique To Create Positive-negative mentioning

confidence: 99%

Positive-negative tunable liquid crystal lenses based on a microstructured transmission line

Algorri

Morawiak

Bennis

et al. 2020

Sci Rep

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In this work, a novel technique to create positive-negative tunable liquid crystal lenses is proposed and experimentally demonstrated. This structure is based on two main elements, a transmission line acting as a voltage divider and concentric electrodes that distribute the voltage homogeneously across the active area. This proposal avoids all disadvantages of previous techniques, involving much simpler fabrication process (a single lithographic step) and voltage control (one or two sources). In addition, low voltage signals are required. Lenses with switchable positive and negative focal lengths and a simple, low voltage control are demonstrated. Moreover, by using this technique other optical devices could be engineered, e.g. axicons, Powell lenses, cylindrical lenses, Fresnel lenses, beam steerers, optical vortex generators, etc. For this reason, the proposed technique could open new venues of research in optical phase modulation based on liquid crystal materials.

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Section: In This Work a Novel Technique To Create Positive-negative mentioning

confidence: 99%

Positive-negative tunable liquid crystal lenses based on a microstructured transmission line

Algorri

Morawiak

Bennis

et al. 2020

Sci Rep

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“…При моделировании работы ЖК устройства апертура полагалась квадратной с длиной стороны 2 mm; для расчета фазовой задержки использовалась экспериментальная вольт-фазная характеристика ЖКBL037 [13], нормированная на толщину слоя (l LC ). Моделирование выполнялось для разных значений потенциалов, удовлетворяющих условию (1).…”

Section: результаты численного моделированияunclassified

“…В работе [13] продемонстрирована возможность создания с помощью 4-канального ЖК модулятора аксиальносимметричных оптических вихрей (световых колец с орбитальным угловым моментом). Для этого необходимо несколько изменить геометрию контактов электродов ЖК модулятора таким образом, чтобы, подавая специально выбранные значения потенциалов, обеспечить скачок в фазовом профиле пропускания ЖК модулятора.…”

Section: Introductionunclassified

Возможность Формирования Двухлепестковых Вихревых Световых Полей С Помощью Модифицированного ЖК Фокусатора-=sup=-*-=/Sup=-

Котова¹,

Майорова²,

Самагин³

2019

Журнал Технической Физики

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Поступила в редакцию 24.09.2018 г.Проанализированы возможности формирования световых полей с распределением интенсивности в виде двух максимумов, вращающихся в процессе распространения, с помощью жидкокристаллического модального устройства. Оцениваются скорости поворота распределения интенсивности в зависимости от радиуса кривизны падающей на модулятор волны, а также энергетическая эффективность сформированных полей.Рис. 3. Распределения интенсивности светового поля, формируемого ЖК фокусатором в плоскости наблюдения в зависимости от ее положения. Расстояние от ЖК фокусатора до плоскости наблюдения 20 (а), 22 (b), 24 (c), 26 (d) и 28 сm (е).Оптика и спектроскопия, 2019, том 126, вып. 1

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“…Liquid crystal displays (LCD) are amplitude modulators mostly used as displays in laptops, TVs, cellphones, and tablets for years [4][5][6][7]. The other kind of modulators, phase modulators, have applications such as electrically controlled lenses [8][9][10], optical tweezers [11,12], laser beam shaping [13,14], 3D holographic displays [15], and laser wavelength control [16,17].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the optical properties of the liquid crystal-based devices via Mueller matrix formalism

Polat¹

2018

Turk J Phys

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Abstract:A model approach for the Mueller matrix (MM) of the twisted nematic liquid crystal spatial light modulator (TNLC-SLM) was proposed. In the first part of the study, the MM of the TNLC cell in the absence of applied voltage was investigated both theoretically and experimentally. In the second part, the model approach was improved by considering the reorientation of both tilt and azimuth angles of the liquid crystal (LC) molecules in the presence of applied voltage.Comparison of the theoretical MM elements with the experimental ones from the literature showed that, instead of decaying exponentially, the azimuth angle rotates with respect to the cell walls in a critical voltage range before the molecules are completely untwisted. It also pointed out that the effect of the tilt and the azimuth angles of the molecules on the optical properties of the light travelling in the LC cell could change depending on the polarization state of the input light and the voltage applied to the cell.

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Formation of ring-shaped light fields with orbital angular momentum using a modal type liquid crystal spatial modulator

Cited by 14 publications

References 21 publications

Positive-negative tunable liquid crystal lenses based on a microstructured transmission line

Positive-negative tunable liquid crystal lenses based on a microstructured transmission line

Возможность Формирования Двухлепестковых Вихревых Световых Полей С Помощью Модифицированного ЖК Фокусатора-=sup=-*-=/Sup=-

Investigation of the optical properties of the liquid crystal-based devices via Mueller matrix formalism

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