Integral Imaging Capture System With Tunable Field of View Based on Liquid Crystal Microlenses

Algorri, José Francisco; Urruchi, V.; Bennis, N.; Morawiak, Przemysław; Sánchez‐Pena, José Manuel; Otón, J. M.

doi:10.1109/lpt.2016.2572258

Cited by 30 publications

(20 citation statements)

References 13 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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show abstract

“…In 31 it was demonstrated a control of the FOV and the Multiview image processing with LC lenses. In this case, this mulifocal lens array would be capable of the DOF control with the added advantage of extension of the same one 27 .…”

Section: Experimental Set-up and Resultsmentioning

confidence: 99%

“…The DOF has been demonstrated to be tunable in 29 and 30 . In 31 LC microlenses were proposed in order to increase the viewing angle or field of view (FOV).…”

Section: Introductionmentioning

confidence: 99%

Tunable liquid crystal multifocal microlens array

Algorri

Bennis

Urruchi

et al. 2017

Sci Rep

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A novel liquid crystal microlens array with tunable multifocal capability, high optical power and fill-factor is proposed and experimentally demonstrated. A specific hole pattern design produces a multifocal array with only one voltage control. Three operations modes are possible, “Off”, “Tunable Multifocal” and “Unifocal”. The design is patterned in both substrates. Then, the substrates are arranged in symmetrical configuration. The result is a high optical power in comparison with typical hole patterned structures. Besides, it is proposed a hexagonal pattern that produces a high fill factor, specially indicated for some applications as Integral Imaging. The array has several useful characteristics for this type of application: tunability for the loss of resolution; multifocal for extended DOF; high fill factor for increase the number of views; and low power consumption for integration in portable devices. Moreover, the optical characteristics of the proposed device could bring new applications in other fields.

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“…This dependence gives raise to the possibility of designing liquid crystal mixtures with very low relaxation frequencies of electric permittivity parallel ε∥, which is useful for many applications [16]. Apart from traditional SLM, the unique properties of this LC mixture can be used in all kind of optical phase modulators recently reported, e.g., adaptive lenses [17], beam steering [18], correction of aberrations [19], 3D vision applications [19][20][21][22], novel aberrations correctors for rectangular apertures [23], microaxicon arrays [24], multioptical elements [25], hole-patterned microlenses [26], multifocal microlenses [27], high fill-factor microlenses [28], frequency controlled [29] microlenses, optical vortices [30], lensacons, and logarithmic axicons [31]. The LC mixtures used in this work have been designed by mixing three different families of LC compounds to meet the requirements of the LC to be controlled by low frequencies of the electrical applied voltage.…”

Section: Influence Of Nlc Mixtures On Dielectric Relaxationmentioning

confidence: 99%

Multifrequency Driven Nematics

et al. 2019

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Liquid crystals act on the amplitude and the phase of a wave front under applied electric fields. Ordinary LCs are known as field induced birefringence, thus both phase and amplitude modulation strongly depend on the voltage controllable molecular tilt. In this work we present electrooptical properties of novel liquid crystal (LC) mixture with frequency tunable capabilities from 100Hz to 10 KHz at constant applied voltage. The frequency tunability of presented mixtures shown here came from composition of three different families of rodlike liquid crystals. Dielectric measurements are reported for the compounds constituting frequency-controlled birefringence liquid crystal. Characterization protocols allowing the optimum classification of different components of this mixture, paying attention to all relevant parameters such as anisotropic polarizability, dielectric anisotropy, and dipole moment are presented.

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Integral Imaging Capture System With Tunable Field of View Based on Liquid Crystal Microlenses

Cited by 30 publications

References 13 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

Tunable liquid crystal multifocal microlens array

Multifrequency Driven Nematics

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