Multi-electrode tunable liquid crystal lenses with one lithography step

Beeckman, Jeroen; Yang, Tzu-Hsuan; Nys, Inge; George, John P.; Lin, Tsung‐Hsien; Neyts, Kristiaan

doi:10.1364/ol.43.000271

Cited by 53 publications

(35 citation statements)

References 19 publications

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“…3) formed from NLC 4-Cyano-4'-pentylbiphenyl (4-Cyano-4'-pentylbiphenyl or 5CB), well known from publications in the scientific and scientific literature (see e.g. [1][2][3][4][5], as well as planar waveguide NLC 3D lenses ( fig. 3).…”

Section: Experimental Setup Waveguiding Nlc Structuresmentioning

confidence: 99%

“…In the present work, integrated-optical waveguides and thin-layer waveguide lenses formed with the help of the nematic liquid crystal (NLC) [1,2], including the imposition of an electric field [3][4][5][6][7], are investigated.…”

Section: Introductionmentioning

confidence: 99%

“…The basis of most of the electro-and magneto-optical effects specific for LC is the director's (the axis of the predominant direction of molecules of a macroscopic volume of matter) reorientation under the action of a field or a fluid flow [1][2][3][4][5][6][7]. A change in the direction of the preferred orientation of the molecules (director) of the liquid crystal under the influence of an external electric (or magnetic) field leads to a significant change in the properties of the LC.…”

Section: Introductionmentioning

confidence: 99%

“…with the half-width intensity profile at the focal distance, including the theoretical diffraction limited spot, given in the paper [5] for tunable liquid crystal lenses.…”

mentioning

confidence: 99%

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Irregular liquid crystal waveguide structures: analysis of quasi-stationary fluctuations, power loss and statistical properties of irregularities.

Egorov¹,

Ayriyan²,

Ayrjan³

2020

JRE

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Irregular nematic liquid crystal waveguide structures were investigated by the numeric simulation and experimentally. The dependence of attenuation coefficient (optical losses) of the waveguide modes and the effective sizes (correlation radii) of quasi-stationary irregularities of the liquid-crystal layer on the linear polarization of the incident laser radiation and the presence of pulse-periodic electric field were experimentally observed and investigated. An estimate is made of the correlation radii of liquid-crystal waveguide quasi-stationary irregularities. The observed decrease in the attenuation coefficient of the waveguide modes and the effective sizes of irregularities in the liquid-crystal layer, when the external electric field is switched on, explained by the effect of the decrease in the fluctuations correlation radii of the local orientation of the molecules of the liquid crystal. Experimental spectral density function of the statistical quasi-stationary nematic liquid crystal irregularities was restored and relevant statistical parameters are given. The obtained results are undoubtedly important for further research of dynamic processes inside non stationary waveguide liquid crystal layers, both from the theoretical point of view for understanding kinetic processes in the liquid crystals, and with practical,-in the organization and carrying out suitable experimental researches.

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Section: Experimental Setup Waveguiding Nlc Structuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…with the half-width intensity profile at the focal distance, including the theoretical diffraction limited spot, given in the paper [5] for tunable liquid crystal lenses.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Irregular liquid crystal waveguide structures: analysis of quasi-stationary fluctuations, power loss and statistical properties of irregularities.

Egorov¹,

Ayriyan²,

Ayrjan³

2020

JRE

View full text Add to dashboard Cite

show abstract

“…Liquid crystal (LC) lens is well documented in the visible range due to its splendid electro-tunability [13][14][15][16]. Its THz counterpart has been expected for a long time.…”

Section: Introductionmentioning

confidence: 99%

Liquid crystal tunable terahertz lens with spin-selected focusing property

Shen

Zhou

et al. 2019

Opt. Express

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We propose and demonstrate an active spin-selected lens with liquid crystal (LC) in the terahertz (THz) range. The lens is a superposition of two geometric phase lenses with separate centers and conjugated phase profiles. Its digitalized multidirectional LC orientations are realized via a dynamic micro-lithography-based photo-patterning technique and sandwiched by two graphene-electrode-covered silica substrates. The specific lens can separate the focusing spots of incident light with opposite circular polarizations. Its focusing performance from 0.8 to 1.2 THz is characterized using a scanning near-field THz microscope system. The polarization conversion efficiency varies from 32.1% to 70.2% in this band. The spin-selected focusing functions match well with numerical simulations. Such lens exhibits the merit of dynamic functions, low insertion loss and broadband applicability. It may inspire various practical THz apparatuses.

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Adaptive Spiral Diffractive Lenses—Lenses With a Twist

Geday

Caño‐García

Otón

et al. 2020

Advanced Optical Materials

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An SDL results from adding the radially varying phase delay of a conventional Fresnel diffractive lens [22] with the azimuthally varying phase delay of a spiral phase plate (SPP) [23] and then perform a phase-wrapping about 2π (Figure 1a-c). A similar process has recently been presented by Guo et al. for generating axicons. [24] An alternative SDL could have been produced starting with a lens with twice the optical power and twice the topological charge (Figure 1d-f). The equation describing the constant phase spiral symmetry of this lens can be cast as

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Multi-electrode tunable liquid crystal lenses with one lithography step

Cited by 53 publications

References 19 publications

Irregular liquid crystal waveguide structures: analysis of quasi-stationary fluctuations, power loss and statistical properties of irregularities.

Irregular liquid crystal waveguide structures: analysis of quasi-stationary fluctuations, power loss and statistical properties of irregularities.

Liquid crystal tunable terahertz lens with spin-selected focusing property

Adaptive Spiral Diffractive Lenses—Lenses With a Twist

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