Self-Driven Droplet Powered By Active Nematics

“…2 (3) s s ε χ >> E ), it can be considered in the first order of perturbation. This means that one can neglect nonlinearity-driven variance in the field structure and account for the self-action of the electromagnetic field via the averaged field [34]. Hence, we present the shell permittivity as…”

Section: Nonlinear Steady-state Solutionmentioning

confidence: 99%

“…In Section II we present the general theoretical model describing both the nonlinear steady-states and dynamical switching between them. Being in the framework of the quasistatic approximation, we account for the intrinsic nonlinear response of the metal via the self-consistent mean-field approximation [34][35][36] and find the steady-state solution. Then we employ the dispersion relation method [37][38][39][40][41][42] to develop the dynamical theory of switching.…”

Section: Introductionmentioning

confidence: 99%

Optical tristability and ultrafast Fano switching in nonlinear magnetoplasmonic nanoparticles

Sun

et al. 2018

Phys. Rev. B

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We consider light scattering by a coated magneto-plasmonic nanoparticle (MPNP) with a Kerr-type nonlinear plasmonic shell and a magneto-optic core. Such structure features two plasmon dipole modes, associated with electronic oscillations on the inner and outer surfaces of the shell. Driven in a nonlinear regime, each mode exhibits a bistable response. Bistability of an inner plasmon leads to switching between this state and a Fano resonance (Fano switching). Once the external light intensity exceeds the critical value, the bistability zones of both eigen modes overlap yielding optical tristability characterized by three stable steady states for a given wavelength and light intensity. We develop a dynamic theory of transitions between nonlinear steady states and estimate the characteristic switching time as short as 0.5 ps. We also show that the magneto-optical (MO) effect allows red-and blue-spectral shift of the Fano profile for right-and left-circular polarizations of the external light, rendering Fano switching sensitive to the light polarization. Specifically, one can reach Fano switching for the right circular polarization while cancelling it for the left circular polarization. Our results point to a novel class of ultrafast Fano switchers tunable by magnetic field for applications in nanophotonics.

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“…In particular, microtubule-based systems have demonstrated to respond to frictional/viscous gradients 14,26 or to geometric and topological constrains by organizing their chaotic motion into regular spatio-temporal flow patterns [37][38][39][40][41][42][43][44] . Theoretical and numerical studies have also assessed the impact of confinement in active motility [45][46][47][48][49][50][51][52][53][54][55][56][57][58] , predicting a rich variety of behavior emerging from the interplay between geometry of the confining space, intrinsic order of the active material and collective flows.…”

Section: Introductionmentioning

confidence: 99%