Non locality and nonlinearity in reorientational media: nematic liquid crystals



Theoretical, numerical and experimental investigation of nonlinear optics in nematic liquid crystals, including reorientational, thermo-optic and dissipative (with gain) nonlinear responses, nonlocal spatial solitons, routing, interactions and transverse modulational instability. Nematic liquid crystals are investigated in planar cells and in light valves, in the presence of various anchoring mechanisms, dopants, distribution of applied voltage(s) and external light beams.


Collaborations

School of Physics and Astronomy, University of Southampton, Southampton, United Kingdom

Warsaw University of Technology, Warsaw, Poland

Institut Non Linéaire de Nice, Université de Nice "Sophia Antipolis" , Nice, France

Department of Electrical Engineering, The Pennsylvania State University, Philadelphia, USA

Department of Physics, University of Calabria, Arcavacata di Rende (CS), Italy

School of Mathematics, The King’s Buildings, University of Edinburgh, Edinburgh, Scotland, UK

Department of Mathematics and Mechanics, Instituto de Investigación en Matemáticas Aplicadas y Sistemas (IIMAS), Universidad Nacional Autónoma de México, Distrito Federal, México


People

Gaetano Assanto, Marco Peccianti, Raouf Barboza, Armando Piccardi, Alessandro Alberucci


Related publications

2017

All-optical guided-wave random laser in nematic liquid crystals
Optics Express Vol. 25, Issue 5, pp. 4672-4679 (2017)

Erratum: \"Soliton-assisted random lasing in optically-pumped liquid crystals
Appl. Phys. Lett. 110 (1), 1019902 (2017)

Bistable beam propagation in liquid crystals
IEEE Journal of Quantum Electronics Volume: 53, Issue: 1,

Interplay between diffraction and the Pancharatnam-Berry phase in inhomogeneously twisted anisotropic media
Phys. Rev. A 95, 023823 (2017)

2016

Linear and nonlinear light beam propagation in chiral nematic liquid crystal waveguides
Photon. Lett. Pol. 8 (1), 1 (2016)

Quenching nematicon fluctuations via photostabilization
Photon. Lett. Pol. 8 (1), 2-4 (2016)

Nonlocal soliton scattering in random potentials
Journal of Optics, Volume 18, Number 7

Breather solitons in highly nonlocal media
Journal of Optics, Volume 18, Number 12

Quasi two-dimensional astigmatic solitons in soft chiral metastructures
Scientific Reports 6, Article number: 22923 doi:10.1038/srep22923

Soliton-assisted random lasing in optically-pumped liquid crystals
Appl. Phys. Lett. 109, 161105 (2016)

Voltage-driven beam bistability in a reorientational uniaxial dielectric
APL Photonics 1, 011302 (2016)

2015

Nonlinear competition in nematicon propagation
Optics Letters Vol. 40, Issue 22, pp. 5235-5238 (2015)

Observation of stable vector vortex solitons
Opt. Lett. 40 (17), 4182-5 (2015)

Nonlinear negative refraction in reorientational soft matter?
Phys. Rev. A 92, 033835 (2015)

Soliton enhancement of sponaneous symmetry breaking
Optica 2 (9), 783-9 (2015)

Observation of beam self-induced transition from positive to negative optical refraction in nematic liquid crystals
Mol. Cryst. Liq. Cryst. 619 (1), 28-34 (2015)

Spatial optical solitons in highly nonlocal media
Phys. Rev. A 91, 013841 (2015)

2014

Nematic liquid crystals: An excellent playground for nonlocal nonlinear light localization in soft matter
J. Nonlinear Optic. Phys. Mat. 23, 1450046

Nematicons in planar cells subject to the optical Freedericksz threshold
Opt. Express 22 (25), 30663-30668 (2014)

Power-induced evolution and increased dimensionality of nonlinear modes in reorientational soft matter
Opt. Lett. 39 (22), 6399-6402 (2014)

Power-controlled transition from standard to negative refraction in reorientational soft matter
Nat. Commun. 5:5533 doi: 10.1038/ ncomms6533 (2014)

Beam hysteresis via reorientational self-focusing
Opt. Lett. 39, 5830-5833 (2014)

Accessible solitons in diffusive media
Opt. Lett. 39 (15), 4317-4320 (2014)

Bistability with Optical Beams Propagating in a Reorientational Medium
Phys. Rev. Lett. 113, 023901 (2014)

Deflection of Nematicon-Vortex Vector Solitons in Liquid Crystals
Phys. Rev. A 89, 013827 (2014)

Vortex confinement and bending with the aid of nonlocal solitons
Opt. Lett. 39 (3), 509-512 (2014)

2013

Nematicons and their electro-optic control: light localization and signal readdressing via reorientation in liquid crystals
Int. J. Mol. Sci. 14 (10), 19932-19950 (2013)

Comment on "Solitons in highly nonlocal nematic liquid crystals: Variational approach"
Phys. Rev. A 87 (4), 047801 (2013)

Deflection of nematicons through interaction with dielectric particles
J. Opt. Soc. Am. B 30 (6), 1432-1437 (2013)

Properties of nematicons in low-birefringent nematic liquid crystals
Phot. Lett. Pol. 4 (1), 2-4 (2013)

Frequency-Controlled Routing of Self-Confined Beams in Nematic Liquid Crystals
Mol. Cryst. Liq. Cryst. 572 (1), 26-33 (2013)

Modeling nematicon propagation
Mol. Cryst. Liq. Cryst. 572 (1), 2-12 (2013)

Optical Vortex Generation in Nematic Liquid Crystal Light Valves
Mol. Cryst. Liq. Cryst. 572 (1), 24-30 (2013)

Interactions of accessible solitons with interfaces in anisotropic media: the case of uniaxial nematic liquid crystals
New J. Phys. 15, 043011 (2013)

Characterization of the vortex-pair interaction law and nonlinear mobility effects
New J. Phys. 15 (1), 013028 (2013)

2012

Power-Dependent Nematicon Self-Routing
Nematicons, Ed. G. Assanto, Wiley, ISBN: 978-0-470-90724-5 (2012)

Discrete Light Propagation in Arrays of Liquid Crystalline Waveguides
Nematicons, Ed. G. Assanto, Wiley, ISBN: 978-0-470-90724-5 (2012)

Nematicons in Light Valves
Nematicons, Ed. G. Assanto, Wiley, ISBN: 978-0-470-90724-5 (2012)

External Control of Nematicon Paths
Nematicons, Ed. G. Assanto, Wiley, ISBN: 978-0-470-90724-5 (2012)

Refraction of Nonlinear Light Beams in Nematic Liquid Crystals
J. Nonl. Opt. Phys. Mat. 21 (3), 1250033 (1-21) (2012)

All-optical switching of a signal by a pair of interacting nematicons
Opt. Express 20 (22), 24701 (2012)

Frequency-controlled acceleration of spatial solitons in nematic liquid crystals
Appl. Phys. Lett. 101, 081112 (2012)

Nematicon waveguides: self-confined beams and their electric control
Appl. Phys. B 108, 177-182 (2012)

Self-guided beams in low-birefringence nematic liquid crystals
Phys. Rev. A 86, 013824 (2012)

In-plane steering of nematicon waveguides across an electrically tuned interface
Appl. Phys. Lett. 100, 251107 (2012)

Nematicons in azobenzene liquid crystals
Mol. Cryst. Liq. Cryst. 559 (1), 202-213 (2012)

Dark Spatial Solitons in Liquid Crystals
Mol. Cryst. Liq. Cryst. 558, 168-175 (2012)

Electro-optic beam steering with nematicons
Mol. Cryst. Liq. Cryst. 558, 12-21 (2012)

Tunable nonlinearity in nematicon physics
Mol. Cryst. Liq. Cryst. 558, 2-11 (2012)

Parametric conversion in micrometer and sub-micrometer structured ferroelectric crystals by surface poling.
International Journal of Optics, Article ID 606892, (2012)

Electro-optic steering of nematicons
Phot. Lett. Pol. 4 (1), 2-4 (2012)

Scattering of reorientational optical solitons at dielectric perturbation
Phys. Rev. A 85 (1), 013804 (2012)

2011

An electro-optically tunable Bragg reflector based on liquid crystals
Mol. Cryst. Liq. Cryst. 549 (1), 62-8 (2011)

Nematicon self-steering
Mol. Cryst. Liq. Cryst. 549, 1-9 (2011)

Transverse self-accelaration of nematicons: can a self-confined beam change its own path?
J. Nonl. Opt. Phys. Mat. 20, 237-247 (2011)

Dipole azimuthons and charge-flipping in nematic liquid crystals
Opt. Express 19 (22), 21457-66 (2011)

Trends and trade-offs in nematicon propagation
Appl. Phys. B 104 (4), 805-11 (2011)

Modulation Analysis of Nonlinear Beam Refraction at an Interface in Liquid Crystals
Phys. Rev. A 84, 033818 (2011)

Large electro-optic beam steering with Nematicons
Opt. Lett. 36 (14), 26113 (2011)

Nematicon-nematicon interactions in a medium with tunable nonlinearity and fixed nonlocality
Opt. Lett. 36 (13), 2566-8 (2011)

Lagrange Solution for Three Wavelength Soliton Clusters in Nematic Liquid Crystals
Physica D 240, 1213-1219 (2011)

Optical Solitons and Wave-Particle Duality
Opt. Lett. 36 (10), 1848-50 (2011)

Non Paraxial Solitary waves in anisotropic dielectrics
Phys. Rev. A 83, 033822 (2011)

Multimode nematicon waveguides
Opt. Lett. 36 (2), 184-6 (2011)

2010

Power-dependent nematicon steering via walk-off
J. Opt. Soc. Am. B 27 (11), 2398-404 (2010)

Power-dependent nematicon steering via walk-off
J. Opt. Soc. Am. B 27, 2398-2404 (2010)

Refraction of Nonlinear Beams by Localised Refractive Index Changes in Nematic Liquid Crystals
Phys. Rev. A 82, 053843 (2010)

Enhancement of third harmonic generation in nonlocal spatial solitons
Opt. Lett. 35 (20), 3342 (2010)

Nematicons in Liquid Crystal Light Valves
Mol. Cryst. Liq. Cryst. 527, 98-108 (2010)

Propagation of spatial optical solitons in a dielectric with adjustable nonlinearity
Phys. Rev. A 82, 023806 (2010)

Sub-milliwatt dissipative nematicons and spontaneous light emission in dye-doped nematic liquid crystals
Electron. Lett. 46, 790 (2010)

Nematicons beyond the perturbative regime
Opt. Lett. 35 (15), 2520-2 (2010)

Solitary wave propagation and steering through light-induced refractive potentials
Phys. Rev. A 81, 063811 (2010)

Self-turning self-confined light beams in guest-host media
Phys. Rev. Lett. 104, 213904 (2010)

Space-Time Bullet Trains via modulation instability and nonlocal solitons
Opt. Express 18 (6), 593441 (2010)

Readdressable interconnects with spatial soliton waveguides in liquid crystal light valves
IEEE Photon. Technol. Lett. 22, 694 (2010)

Soliton gating and switching in liquid crystal light valve
Appl. Phys. Lett. 96, 071104 (2010)

Soliton self-deflection via power-dependent walk-off
Appl. Phys. Lett. 96, 061105 (2010)

Counterpropagating nematicons in bias-free liquid crystals
Opt. Express 18 (4), 3258-3263 (2010)

Nematicon All-optical control in liquid crystal light valves
Opt. Lett 35 (3), 390-2 (2010)

2009

Optical path control of solitary waves in dye-doped nematic liquid crystals
Photon. Lett. Pol. 1 (4), 154-156 (2009)

Liquid Crystal Light Valves: a versatile platform for Nematicons
Photon. Lett. Pol. 1 (4), 151-153 (2009)

Modulation analysis of boundary-induced motion of optical solitary waves in a nematic liquid crystal
Phys. Rev. A 79, 043816 (2009)

Nematicons in twisted liquid crystals
Photon. Lett. Pol. 1 (1), 7-9 (2009)

Nematicons escaping a wide trapping potential: modulation theory
Phys. Rev. A 79, 033837 (2009)

Voltage-driven in-plane steering of nematicons
Appl. Phys. Lett. 94, 091106 (2009)

Spatial solitons in liquid crystal light valves
Opt. Lett. 34 (6), 737-739 (2009)

Collisionless shock resolution in nematic liquid crystals
Phys. Rev. A 78 (6), 063808 (2009)

2008

Incoherent interaction of nematicons in biasfree liquid crystal cells
J. Eur. Opt. Soc. 5, 10008--1-5 (2008)

All-optical steering of soliton waveguides in dye doped liquid crystals
Appl. Phys. Lett. 93, 171104 (2008)

Escaping Solitons from a trapping potential
Phys. Rev. Lett. 101, 153902 (2008)

Guiding and Bending Light at Will with Spatial Solitons in Liquid Crystals
Int. J. Microw. Opt. Techn. 3 (3), 370-6 (2008)

2007

Light induced angular steering via Floquet-Bloch band-tunneling in one-dimensional liquid crystalline photonic lattices
Opto-Electronics Rev. 15, 210-214 (2007)

Dissipative self-confined optical beams in doped nematic liquid crystals
J. Nonl. Opt. Phys. & Mat. 16, 295-305 (2007)

Nonlinear bouncing of nonlocal spatial solitons at the boundaries
Opt. Lett. 32, 2795-2797 (2007)

Tunable wavelength-selective add-drop in Liquid Crystals on Silicon microresonator
Opt. Commun. 279, 210-213 (2007)

Propagation of optical spatial solitons in finite size media: interplay between non locality and boundary conditions
J. Opt. Soc. Am. B 24, 2314-2320 (2007)

Nonlinear management of the angular momentum of soliton clusters: Theory and experiment
Phys. Rev. A 75, 063835 (2007)

Nematicons across interfaces: anomalous refraction and reflection of solitons in liquid crystals
Opt. Express 15, 8021-8028 (2007)

Routing light at will
J. Nonl. Opt. Phys. & Mat. 16, 37-48 (2007)

Nonlinearly controlled angular momentum of soliton clusters
Opt. Lett. 32, 1447-1449 (2007)

Spatial solitons in nematic liquid crystals: from bulk to discrete
Opt. Express 15, 5248-5259 (2007)

Discrete optics in liquid crystalline lattices
LEOS Newslett. 2, 11-16 (2007)

Nonspecular total internal reflection of spatial solitons at the interface between highly birefringent media
Phys. Rev. Lett. 98, 113902 (2007)

Nonlinear shift of spatial solitons at a graded dielectric interface
Opt. Lett. 32, 271-273 (2007)

2006

Tunable refraction and reflection of self-confined light beams
Nature Phys. 2, 737-742 (2006)

Discrete light propagation and self-localization in voltage-controlled arrays of channel waveguides in undoped nematic liquid crystals
Mol. Cryst. Liq. Cryst. 453, 191-202 (2006)

Two-color vector solitons in nonlocal media
Phys. Rev. Lett. 97, 153903 (2006)

Governing soliton splitting in one-dimensional lattices
Phys. Rev. E 73, 046603 (2006)

Nematicons and their angular steering
J. Nonl. Opt. Phys. Mat. 15, 33-42 (2006)

All-optical Landau-Zener tunneling in waveguide arrays
Opt. Express 14, 2021-2026 (2006)

Spatial Soliton All-Optical Logic Gates
IEEE Photon. Techn. Lett. 18 , 1287-1289 (2006)

2005

Discrete light propagation and self-trapping in liquid crystals
Opt. Express 13, 1808-1815 (2005)

Interplay between nonlocality and nonlinearity in nematic liquid crystals
Opt. Lett. 30, 415-417 (2005)

All-optical switching and beam steering in tunable waveguide arrays
Appl. Phys. Lett. 86, 51112-51114 (2005)

Nonlinear all-optical switch with nematic liquid crystals
Appl. Phys. Lett. 86, 51109-51111 (2005)

Spectral evolution of an optical pattern in non local nematic liquid crystals
Opt. Express 13, 6476-6481 (2005)

Self-healing generation of spatial solitons in liquid crystals
Opt. Lett. 30, 1381-1383 (2005)

Nematic Liquid Crystal Waveguide Arrays
Optoelectron. Rev. 13, 107-12 (2005)

Non local incoherent spatial solitons in liquid crystals
J. Opt. Soc. Am. B 22, 1371-1377 (2005)

Electro-optic routing in a nematic liquid crystal waveguide
Appl. Opt. 44, 4136-4143 (2005)

Spatial solitons and modulational instability in the presence of large birefringence: The case of highly nonlocal liquid crystals
Phys. Rev. E 72, 066614 (2005)

Signal processing by opto-optical interactions between self-localized and free propagating beams in liquid crystals
Appl. Phys. Lett. 87, 261104 (2005)

Discrete light localization in one-dimensional nonlinear lattices with arbitrary nonlocality
Phys. Rev. E 72, 066608 (2005)Form

Observation of power-dependent walk-off via modulation instability in nematic liquid crystals
Opt. Lett. 30, 2290-2292 (2005)

Optical multiband vector breathers in tunable waveguide arrays
Opt. Lett. 30, 174-176 (2005)

Spatially incoherent modulational instability in a non local medium
Laser Phys. Lett. 2, 25-29 (2005)

Integrated electro-optic switch in liquid crystals
Opt. Express 13, 32-37 (2005)

2004

Nonlinear Optics Applications: Bright Spatial Solitons
Encyclopedia of Modern Optics, Vol. 5, 43-55 (2004)

Discrete propagation and spatial solitons in nematic liquid crystals
Opt. Lett. 29, 1530 (2004)

Observation of Optical Spatial Solitons in a Highly Nonlocal Medium
Phys. Rev. Lett. 92, 113902 (2004)

Highly non-local optical solitons and their observation in nematic liquid crystals
Int. Mod. Phys. Lett. B 18, 2819-2828 (2004)

Spiraling and Cyclic Dynamics of Nematicons
Mol. Cryst. Liq. Cryst. 421, 197-207 (2004)

Discrete optical solitons in nematic liquid crystals
Mol. Cryst. Liq. Cryst. 421, 61-68 (2004)

Routing of anisotropic spatial solitons and modulational instability in liquid crystals
Nature 432, 733-737 (2004)

One dimensional transverse modulational instability in nonlocal media witha reorientational nonlinearity
IEEE J. Sel. Top. Quantum Electron. 10, 862-869 (2004)

Transverse dynamics of nematicons
Opt. Express 12, 6524-6529 (2004)

2003

Nonlocal Optical Propagation in Nonlinear Nematic Liquid Crystals
J. Nonl. Opt. Phys. Mat 12, 525-538 (2003)

Optical multisoliton generation in nematic liquid crystals
Opt. Lett. 28(22), 2231-2233 (2003)

Nonlinear wave propagation and spatial solitons in nematic liquid crystals
J. Nonl. Opt. Phys. Mat. 12, 123-134 (2003)

Optical modulational instability in a nonlocal medium
Phys. Rev. E 68, 025602 (2003)

Route to Nonlocality and Observation of Accessible Solitons
Phys. Rev. Lett. 91, 73901-3 (2003)

Spatial Optical Solitons in bulk Nematic Liquid Crystals
Acta Phys. Pol. 103, 161-167 (2003)

Nematicons: optical spatial solitons in nematic liquid crystals
Opt. Photon. News 14, 44-48 (2003)

Spatial solitons in nematic liquid crystals
IEEE J. Quantum Electron. 39, 13-21 (2003)

2002

Self confinement of light in planar cells containing nematic liquid crystals
Radiotekhnika I Electronika 47, 874-880 (2002) (in Russian)

Nonlocal spatial soliton interactions in bulk nematic liquid crystals
Opt. Lett. 27, 1460-1462 (2002)

All-optical switching and logic gating with spatial solitons in liquid crystals
App. Phys. Lett. 81, 333-335 (2002)

Nematic Liquid Crystals: a suitable medium for self-confinement of Coherent and Incoherent Light
Phys. Rev. E 65, 035603-035606 (2002)

Coherent and Incoherent Spatial Solitons in Bulk Nematic Liquid Crystals
Mol. Cryst. Liq. Cryst. 375, 617-629 (2002)

Light Self-Confinement in Planar Cells with Nematic Liquid Crystals
J. Commun. Technol. Electron. 47, 790-795 (2002)

2001

Incoherent Spatial Solitary Waves in Nematic Liquid Crystals
Opt. Lett. 26, 1791-1793 (2001)

Signal readdressing by steering of spatial solitons in bulk Nematic Liquid Crystals
Opt. Lett. 26, 1690-1692 (2001)

2000

Electrically Assisted Self-Confinement and Waveguiding in planar Nematic Liquid Crystal cells
Appl. Phys. Lett. 77, 7-9 (2000)