High-<i>g</i>-factor phase-matched circular dichroism of second harmonic generation in chiral polar liquids

Zhao, Xinyu; Li, Jinxing; Huang, Mingjun; Aya, Satoshi

doi:10.1039/d3tc00981e

Cited by 5 publications

(1 citation statement)

References 54 publications

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“…The N F phase could in the future see a similar tuning by using those materials in mixtures. There have been examples of N F mixtures in literature, [29,36,37,41,42,49,53,60,[62][63][64][65][66] but it must be highlighted that the N F phase has shown that it can withstand non-mesogenic dopants to enhance particular properties such as the nonlinear optical susceptibility. [12,67]…”

Section: Other Potential N F Compoundsmentioning

confidence: 99%

The Emergence of a Polar Nematic Phase: A Chemist's Insight into the Ferroelectric Nematic Phase

Cruickshank

2024

ChemPlusChem

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The discovery of a new polar nematic phase; the ferroelectric nematic, has generated a great deal of excitement in the field of liquid crystals. To date there have been around 150 materials exhibiting the ferroelectric nematic phase, in general following three key archetypal structures with these compounds known as RM734, DIO and UUQU‐4N. In this review, the relationship between the molecular structure and the stability of the ferroelectric nematic, NF, phase will be described from a chemist’s perspective. This will look to highlight the wide variety of functionalities which have been incorporated into these archetypal structures and how these changes influence the transition temperatures of the mesophases present. The NF phase appears to be stabilised particularly by reducing the length of terminal alkyl chains present and adding fluorines laterally along the length of the molecular backbone. This review will look to introduce the background of the ferroelectric nematic phase before then showing the molecular structures of a range of materials which exhibit the phase, describing their structure‐property relationships and therefore giving an up‐to‐date account of the literature for this fascinating new mesophase.

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Section: Other Potential N F Compoundsmentioning

confidence: 99%

The Emergence of a Polar Nematic Phase: A Chemist's Insight into the Ferroelectric Nematic Phase

Cruickshank

2024

ChemPlusChem

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Updated view of new liquid-matter ferroelectrics with nematic and smectic orders

Song,

Aya,

Huang

2024

Giant

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Tunable entangled photon-pair generation in a liquid crystal

Sultanov,

Kavčič,

Kokkinakis

et al. 2024

Nature

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Liquid crystals, with their ability to self-assemble, strong response to an electric field and integrability into complex systems, are key materials in light-beam manipulation1. The recently discovered ferroelectric nematic liquid crystals2,3 also have considerable second-order optical nonlinearity, making them a potential material for nonlinear optics4,5. Their use as sources of quantum light could considerably extend the boundaries of photonic quantum technologies6. However, spontaneous parametric down-conversion, the basic source of entangled photons7, heralded single photons8 and squeezed light9, has so far not been observed in liquid crystals—or in any liquids or organic materials. Here we implement spontaneous parametric down-conversion in a ferroelectric nematic liquid crystal and demonstrate electric-field tunable broadband generation of entangled photons, with an efficiency comparable to that of the best nonlinear crystals. The emission rate and polarization state of photon pairs is markedly varied by applying a few volts or twisting the molecular orientation along the sample. A liquid-crystal source enables a special type of quasi-phase matching10, which is based on the molecular twist structure and is therefore reconfigurable for the desired spectral and polarization properties of photon pairs. Such sources promise to outperform standard nonlinear optical materials in terms of functionality, brightness and the tunability of the generated quantum state. The concepts developed here can be extended to complex topological structures, macroscopic devices and multi-pixel tunable quantum light sources.

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High-g-factor phase-matched circular dichroism of second harmonic generation in chiral polar liquids

Abstract: Circular dichroism is a technologically important phenomenon contrasting the absorption and resultant emission properties between left- and right-handed circularly polarized light. While the chiral handedness of systems mainly determines the...

Cited by 5 publications

References 54 publications

The Emergence of a Polar Nematic Phase: A Chemist's Insight into the Ferroelectric Nematic Phase

The Emergence of a Polar Nematic Phase: A Chemist's Insight into the Ferroelectric Nematic Phase

Updated view of new liquid-matter ferroelectrics with nematic and smectic orders

Tunable entangled photon-pair generation in a liquid crystal

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