Tunable liquid crystal q-plates with arbitrary topological charge

Slussarenko, Sergei; Murauski, Anatoli; Du, Tao; Chigrinov, Vladimir G.; Marrucci, Lorenzo; Santamato, Enrico

doi:10.1364/oe.19.004085

Cited by 309 publications

(224 citation statements)

References 25 publications

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“…The most common methods used to realize such optical ''spin-orbit'' interfaces rely on either bulk [4,5] or surface [6,7] photoalignment techniques of nematogenic films. This allows the director to be controlled while preserving a constant birefringent phase retardation Á.…”

mentioning

confidence: 99%

Manipulating the Orbital Angular Momentum of Light at the Micron Scale with Nematic Disclinations in a Liquid Crystal Film

2013

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We report on the experimental manipulation of the orbital angular momentum of light by exploiting a kind of topological defects that spontaneously appear in nematics-disclinations-as microscopic optical spin-orbit interfaces whose operating wavelength can be controlled electrically. Using six different kinds of disclinations, we demonstrate the efficient generation of both scalar and vectorial singular light beams with a broad topological diversity from a fundamental Gaussian beam.

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confidence: 99%

Manipulating the Orbital Angular Momentum of Light at the Micron Scale with Nematic Disclinations in a Liquid Crystal Film

2013

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“…The q-plate used in the present work is the result of a very recent technological advance allowing for the manufacture of electrically tunable devices with topological charge q = 1/2 (ref. 24). This is the first time such devices are exploited in the quantum regime.…”

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confidence: 87%

Complete experimental toolbox for alignment-free quantum communication

et al. 2012

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Quantum communication employs the counter-intuitive features of quantum physics for tasks that are impossible in the classical world. It is crucial for testing the foundations of quantum theory and promises to revolutionize information and communication technologies. However, to execute even the simplest quantum transmission, one must establish, and maintain, a shared reference frame. This introduces a considerable overhead in resources, particularly if the parties are in motion or rotating relative to each other. Here we experimentally show how to circumvent this problem with the transmission of quantum information encoded in rotationally invariant states of single photons. By developing a complete toolbox for the efficient encoding and decoding of quantum information in such photonic qubits, we demonstrate the feasibility of alignment-free quantum key-distribution, and perform proofof-principle demonstrations of alignment-free entanglement distribution and Bell-inequality violation. The scheme should find applications in fundamental tests of quantum mechanics and satellite-based quantum communication.

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“…Many LC devices are invented for various optical applications, such as LC displays for light intensity control [1], LC Spatial Light Modulator (SLM) for spatial phase modulation [2,3], and Q-plate for controlling orbital angular momentum of photons [4,5]. For all these LC devices, it is critical important to precisely control the LC molecule director distribution.…”

Section: Introductionmentioning

confidence: 99%

“…In this way, a customized LC director distribution can be achieved to offer special designed optical functions. Many photonic devices can be achieved via patterned alignment, including patterned retarders [9,10], Q-plates [4,5], LC gratings [11,12], LC lenses [13][14][15], and polarization converters [16][17][18], etc., which could find many important applications in beam shaping [4], imaging system [13,14], Complementary Metal Oxide Semiconductor (CMOS) sensor system [19] and 3D display [10], etc.…”

Section: Introductionmentioning

confidence: 99%

Ferroelectric Liquid Crystal Dammann Grating by Patterned Photoalignment

et al. 2017

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Abstract:In this article, a ferroelectric liquid crystal (FLC) dammann grating (DG) is demonstrated based on the patterned photoalignment technology. By applying low electric field (10 V) on the FLC DG, the grating can switch between a diffractive state with 7 × 7 optical spots array and a non-diffractive state, depending on the polarity of electric field. The FLC DG shows very fast switching speed with switching on time and off time to be only 81 µs and 59 µs respectively. Comparing with other fast LC DGs such as the ones based on blue phase LC or dual-frequency LC, the switching speed of the proposed FLC DG is about one order faster, which provides great potential and perspective for the FLC DG to be applied in a broad range of optical applications such as optical communication and beam shaping.

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Tunable liquid crystal q-plates with arbitrary topological charge

Cited by 309 publications

References 25 publications

Manipulating the Orbital Angular Momentum of Light at the Micron Scale with Nematic Disclinations in a Liquid Crystal Film

Manipulating the Orbital Angular Momentum of Light at the Micron Scale with Nematic Disclinations in a Liquid Crystal Film

Complete experimental toolbox for alignment-free quantum communication

Ferroelectric Liquid Crystal Dammann Grating by Patterned Photoalignment

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