Optical Fredericks Transition in a Nematic Liquid Crystal Layer

Zhou, Hong; Choate, Eric P.; Wang, Hongyun

doi:10.1007/978-3-319-20270-9_11

Cited by 9 publications

(3 citation statements)

References 33 publications

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“…In our model (which is developed from ref ), nanocavity optical fields [oriented normal to the facet in such thin nanogaps ( E / E 0 ∼ 100)] polarize the extended molecular dipole (orange). A possible preliminary stage is the light-induced rotation of the dipole parallel to the field (a type of near-field optical Fredericks transition) . Its resonant dipolar susceptibility is then massively enhanced by the corresponding multiple-image charges in the plasmonic metal facets above and below (Figure b).…”

Section: Dnao As a Spacer For Precise Nanocavity Fabricationmentioning

confidence: 99%

Amplified Plasmonic Forces from DNA Origami-Scaffolded Single Dyes in Nanogaps

et al. 2023

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Developing highly enhanced plasmonic nanocavities allows direct observation of light−matter interactions at the nanoscale. With DNA origami, the ability to precisely nanoposition single-quantum emitters in ultranarrow plasmonic gaps enables detailed study of their modified light emission. By developing protocols for creating nanoparticle-on-mirror constructs in which DNA nanostructures act as reliable and customizable spacers for nanoparticle binding, we reveal that the simple picture of Purcell-enhanced molecular dye emission is misleading. Instead, we show that the enhanced dipolar dye polarizability greatly amplifies optical forces acting on the facet Au atoms, leading to their rapid destabilization. Using different dyes, we find that emission spectra are dominated by inelastic (Raman) scattering from molecules and metals, instead of fluorescence, with molecular bleaching also not evident despite the large structural rearrangements. This implies that the competition between recombination pathways demands a rethink of routes to quantum optics using plasmonics.

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Section: Dnao As a Spacer For Precise Nanocavity Fabricationmentioning

confidence: 99%

Amplified Plasmonic Forces from DNA Origami-Scaffolded Single Dyes in Nanogaps

et al. 2023

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“…We assume the polarization induced by the colloidal particle surface is along its normal direction n ('homeotropic' orientation), which is a unit vector pointing towards the outside of the surface. This effect is described by the Rapini-Papoular-type surface energy density [1,[35][36][37]…”

Section: Model Introductionmentioning

confidence: 99%

Surface-induced interaction of colloidal particles in isotropic liquid crystals

Zhang,

Weng,

2024

Commun. Theor. Phys.

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In this work, we study the interaction of two colloidal particles in a liquid crystal that is in the isotropic phase. The interaction is caused by surface-induced polarization of the liquid crystal molecules in the vicinity of the particles. We found that the interaction is short-ranged in both 2D and 3D geometry. Under symmetric homeotropic anchoring conditions, the interaction is repulsive. While under anti-symmetric homeotropic anchoring conditions, the interaction is repulsive at short distances but attractive at intermediate distances. The particle size makes a strong impact on the effective interaction force.

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“…One typical type of those anchoring conditions is the strong anchoring that occurs when the surface energy is sufficiently large. In this case, the molecular orientation on the boundary can be simply fixed in a preferred orientation determined by proper alignment techniques (see [47]). Strong anchoring conditions are widely used due to their simplicity.…”

Section: Introductionmentioning

confidence: 99%

Optimal Boundary Control of a Simplified Ericksen–Leslie System for Nematic Liquid Crystal Flows in 2D

Cavaterra

Rocca

2017

Arch Rational Mech Anal

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In this paper, we investigate an optimal boundary control problem for a two dimensional simplified Ericksen-Leslie system modelling the incompressible nematic liquid crystal flows. The hydrodynamic system consists of the Navier-Stokes equations for the fluid velocity coupled with a convective Ginzburg-Landau type equation for the averaged molecular orientation. The fluid velocity is assumed to satisfy a no-slip boundary condition, while the molecular orientation is subject to a time-dependent Dirichlet boundary condition that corresponds to the strong anchoring condition for liquid crystals. We first establish the existence of optimal boundary controls. Then we show that the control-to-state operator is Fréchet differentiable between appropriate Banach spaces and derive first-order necessary optimality conditions in terms of a variational inequality involving the adjoint state variables.

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Optical Fredericks Transition in a Nematic Liquid Crystal Layer

Cited by 9 publications

References 33 publications

Amplified Plasmonic Forces from DNA Origami-Scaffolded Single Dyes in Nanogaps

Amplified Plasmonic Forces from DNA Origami-Scaffolded Single Dyes in Nanogaps

Surface-induced interaction of colloidal particles in isotropic liquid crystals

Optimal Boundary Control of a Simplified Ericksen–Leslie System for Nematic Liquid Crystal Flows in 2D

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