Spatial solitons and parametric effects in ferroelectrics

Theoretical and experimental investigation of parametric (three-waves) effects in ferroelectric quadratic crystals, including cascading, spatial optical solitons, second-harmonic generation, 1D and 2D photonic crystals/lattices of nonlinear origin via quasi-phase-matched interaction in proton exchanged, reverse proton exchanged, poled, surface poled Lithium Niobate and Lithium Tantalate samples. Current goals include backward second harmonic generation, UV wavelength and Terahertz generation.


Department of Electrical, Electronic and Telecommunication Engineering, University of Palermo, Palermo, Italy

CRES - Centro per la Ricerca Elettronica in Sicilia, Monreale, Palermo, Italy

Optoelectronics Research Centre, University of Southampton, Southampton, UK


Gaetano Assanto, Lorenzo Colace, Usman Sapaev, Elena D\'Asaro

Related publications


Thermo-optic soliton routing in nematic liquid crystals
Optics Letters Vol. 43, Issue 10, pp. 2296-229


Nonlinear continuous-wave optical propagation in nematic liquid crystals: Interplay between reorientational and thermal effects
Phys. Rev. E 96, 012703


Highly nonlocal optical response: Benefit or drawback?
Journal of Nonlinear Optical Physics & MaterialsVol. 25, No. 04, 1650043


Diffraction-induced instability of coupled dark solitary waves
Opt. Lett., Vol. 40, Issue 8, pp. 1771-1774 (2015)


Reorientational versus Kerr dark and grey solitons using modulation theory
Phys. Rev. E 84, 066602 (2011)

Features of randomized electric-field assisted domain inversion in Lithium Tantalate
Opt. Express 19 (25), 25780-5 (2011)

Efficient pulse compression and frequency conversion of phase-modulated laser pulses in engineered quasi-phase-matched gratings
Phys. Wave Phenom. 19 (2), 107-11 (2011)


Soft proton exchanged channel waveguides in congruent lithium tantalate for frequency doubling
Opt. Express 25, 25967-72 (2010)

Parametric self-trapping in the presence of random quasi-phase-matching
Opt. Lett. 35 (22), 3760 (2010)

Continuous-Wave Backward Frequency Doubling in Periodically Poled Lithium Niobate
Appl. Phys. Lett. 96, 111110 (2010)

Nonlinear disorder mapping through three wave mixing
IEEE Photon. J. 2 (1), 18-28 (2010)

Nonlinear disorder mapping through three-wave mixing
IEEE Photonics Journal 2, 18-28 (2010)

Random quasi-phase-matched second-harmonic eneration in periodicaly poled lithium tantalate
Opt. Lett. 35, 363-365 (2010)


Quadratic Solitons in Non Collinear Quasi-Phase Matched Geometry
Phys. Rev. A 80, 021801 (2009)


Ultra-Violet Generation in Periodically Poled Lithium Tantalate Waveguides
Appl. Phys. Lett. 93, 121117 (2008)

In-situ tuning of a photonic band-gap with laser pulses
Appl. Phys. Lett. 93, 091111 (2008)

Spatial solitons in two-dimensional lattices of a nonlinear nature
Opt. Photon. News 6, 29-32 (2008)

Transverse nonlinear optics in Heavy Metal Oxide Glass
Phys. Rev. A 77, 043808 (2008)

Parametric solitons in two-dimensional lattices of purely nonlinear origin
Phys. Rev. Lett. 100, 053901 (2008)

Pulse shaping via Backward Second Harmonic Generation
Opt. Express 16, 2115-2121 (2008)

Efficient high-harmonic generation in engineered quasi-phase matching gratings
Opt. Express 16, 18370-18375 (2008)


Spatial solitons in Chi2 planar photonic crystals
Opt. Lett. 32, 3149-3151 (2007)

Compensating group-velocity mismatch in parametric frequency generation
Opt. Lett. 32, 2921-2923 (2007)

Guided-wave frequency doubling in surface periodically poled lithium niobate: competing effects
J. Opt. Soc. Am. B 24, 1564-1570 (2007)

Femtosecond pulse synthesis by efficient second-harmonic generation in engineered quasi phase matching gratings
Opt. Express 15, 7448-7457 (2007)

Ultraviolet Quasi-Phase-Matched Second Harmonic Generation in Surface Periodically Poled Lithium Niobate Optical Waveguides
Laser Phys. 17, 884-888 (2007)


Lithium niobate step-index waveguides for broadband second harmonic generation
J. Nonl. Opt. Phys. 15, 191-202 (2006)

Impedance matching in photonic crystal microcavities for second-harmonic generation
Opt. Lett. 31, 250-252 (2006)

Surface periodic poling in congruent lithium tantalate
Electron. Lett. 42, 546-547 (2006)


Transient-mode excitation, terahertz generation and wavelength shifting in a photonic band gap
Appl. Phys. B 81, 415-420 (2005)

Terahertz pulse generation via optical rectification in photonic crystal microcavities
Opt. Lett. 30, 1174-1176 (2005)

Silica masks for improved surface poling of lithium niobate
Electron. Lett. 41, 92-94 (2005)


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

Nonlinear Optics Basics: Cascading
Encyclopedia of Modern Optics, vol. 3, 207-212 (2004)

Low-threshold spatial solitons in reverse-proton-exchanged periodically poled lithium niobate waveguides
Opt. Lett. 29, 1778 (2004)

Bi-colour spatial solitons in linearly uncoupled planar waveguides
J. Opt. B: Quantum Semiclass. Opt. 6, S217-S222 (2004)

Optical parametric oscillations in isotropic photonic crystals
Opt. Express 12, 823-828 (2004)


Spatial optical simultons in nonlinearly coupled planar waveguides
Opt. Lett. 28, 1031-1033 (2003)

Second Harmonic Generation in coupled LiNbO3 waveguides by reverse proton exchange
IEEE Photon. Techn. Lett. 15, 443-445 (2003)

Novel Spatial Solitons in coupled Lithium Niobate Waveguides by Reverse Proton Exchange
IEEE Photon. Techn. Lett. 15, 537-539 (2003)


Simple physics of quadratic spatial solitons
Opt. Express 10, 388-396 (2002)


Second Harmonic Generation in Reverse Proton Exchanged Lithium Niobate Waveguides
Opt. Express 8, 232-237(2001)

All-optical diode in a periodically-poled Lithium Niobate waveguide
Appl. Phys. Lett. 79, 314-316 (2001)

Efficient Frequency Doubling in Reverse Proton Exchanged Lithium Niobate Waveguides
IEEE Photon. Techn. Lett. 13, 323-325 (2001)

Quadratic Simultons in linear and nonlinear photonic bandgaps
J. Nonl. Opt. Phys. Mat. 10, 197-208 (2001)


Energy localization in photonic crystals of a purely nonlinear origin
Phys. Rev. Lett. 85, 2502-2505 (2000)

Parametric gap solitons and chaos via second-harmonic generation in Bragg gratings
Chaos 10, 590-599 (2000)

Optically Controlled Delay Lines by Pulse Self-Trapping in Parametric Waveguides with Distributed Feedback
IEEE J. Quantum Electron. 36, 931-943(2000)

Cascading phase-shift and multivalued response in counterpropagating frequency nondegenerate parametric amplifiers
Opt. Lett. 25, 966-968 (2000)


Energy localization through Bragg gratings in quadratic media for second-harmonic generation
Acta Phys. Pol. 95, 719-726 (1999)

Analysis of Lithium Niobate All-Optical Wavelength Shifters for the Third Spectral Window
J. Opt. Soc. Am. B 16, 741-753 (1999)

All-optical diode based on second-harmonic generation in an asymmetric waveguide
J. Opt. Soc. Am. B 16, 267-269 (1999)

Self-sustained trapping mechanism of zero-velocity parametric gap solitons
Phys. Rev. E 59, 2467-2469 (1999)

Cavityless oscillation through backward quasi-phase-matched second harmonic generation
Opt. Lett. 24, 1139-1141 (1999)

Unique properties of quadratic solitons
Acta Phys. Pol. A 95, 691-704 (1999)


Parametric gap solitons in quadratic media
Opt. Express 3, 389-404 (1998)

Thin film devices for all-optical switching and processing via quadratic nonlinearities
Thin Solid Films 331, 291-297 (1998)

Multiple branching of vectorial spatial solitary waves in quadratic media
Opt. Commun. 146, 356-362 (1998)

Trapping of slowly-moving or stationary two-color gap solitons
Opt. Lett. 23, 334-336 (1998)

Phase-insensitive All-optical Transistors based on Second-order Nonlinearities
IEEE J. Quantum Electron. 34, 666-672 (1998)

Read/Write All-Optical Buffer by self-trapped Gap Simultons
Electron. Lett. 34, 689-691 (1998)

Excitation of stable transverse wavepackets with quadratic and cubic susceptibilities
Opt. Commun. 150, 390-398 (1998)

Interactions of type II vectorial spatial solitary waves in materials with quadratic nonlinearity
Opt. Quantum Electron. 30, 923-935 (1998)

All-optical Mode Mixer Spatial Switch Based on Cascading in Lithium Niobate
Appl. Phys. Lett. 72, 3405-3407 (1998)

Prism coupling into second-order nonlinear waveguides
Opt. Commun. 146, 95-98 (1998)

Optical gap solitons via second-harmonic generation: exact solitary solutions
Phys. Rev. E 57, R1251-R1254 (1998)

Three-wave simultons: quasi-particles in quadratic media
J. Nonl. Opt. Phys. & Mat. 7, 345-368 (1998)

Robust generation, properties, and potential applications of quadratic spatial solitons generated by optical parametric amplification
Opt. Quantum Electron. 30, 907-921 (1998)


Mode Interplay via Quadratic Cascading in a Lithium Niobate Waveguide for All-Optical Processing
Opt. Quantum Electron. 29, 53-63 (1997)

Collisional interactions of vectorial spatial solitary waves in type II frequency doubling media?,
J. Opt. Soc. Am. B 14, 3151-3161 (1997)

Bidimensional spatial solitary waves in quadratically nonlinear bulk media
J. Opt. Soc. Am. B 14, 3134-3142 (1997)

Phase- and Polarization-Insensitive All-Optical Switching by Self-Guiding in Quadratic Media
Opt. Lett. 22, 1391-1393 (1997)

Beam pointing control with spatial solitary waves in quadratic nonlinear media
Opt. Commun. 134, 223-226 (1997)

Intensity controlled interactions between vectorial spatial solitary waves in quadratic nonlinear media
Opt. Lett. 22, 7-9 (1997)

Doubly resonant Bragg simultons via second-harmonic generation
Phys. Rev. Lett. 78, 2341-2344 (1997)

Bloch Function Approach for parametric gap solitons
Opt. Lett. 22, 445-447 (1997)

Efficient Wavelength Shifting Over the Erbium Amplifier Bandwidth Via Cascaded Second Order Processes in Lithium Niobate Waveguides
Appl. Phys. Lett. 7, 1020-1022 (1997)

Excitation of self-transparency Bragg solitons in quadratic media
Opt. Lett. 22, 1350-1352 (1997)

Quadratic Spatial Soliton Generation By Seeded Down Conversion of a Strong Harmonic Pump Beam
Opt. Lett. 22, 1683-1685 (1997)

Polarization multiplexed χ(2) solitary waves interactions
Opt. Lett. 22 , 1376-1378 (1997)


All-optical switching via quadratic nonlinearities in a Mach-Zehnder Device with Soliton-like pulses
Nonl. Opt. 16, 303-320 (1996)

Soliton Polarization rotation and switching in type II second-harmonic generation
Opt. Lett. 21, 1969-1971 (1996)

A versatile bistable gate via quadratic cascading in a Bragg periodic structure
J. Opt. Soc. Am. B 13, 661-670 (1996)

All-optical switching by spatial walk-off compensation and solitary-wave locking
Appl. Phys. Lett. 68, 1449-1451(1996)

Phase-insensitive, Single wavelength, All-Optical transistor Based on second-Order nonlinearities
Electron. Lett. 32, 1135-1136 (1996)


All-optical Modulation via Nonlinear Cascading in Type II Second Harmonic Generation
Appl. Phys. Lett. 67, 2120-2122 (1995)

Cascading effects in Type II second-harmonic generation: applications to all-optical processing
Opt. Commun. 119, 143-148 (1995)

Guided-wave optical bistability through nonlinear cascading in a phase-matched distributed reflector
Electron. Lett. 31, 1661-1662 (1995)

Second Harmonic Generation: towards an all-optical transistor
Opt. Phot. News 13, Dec.1995

Coherent interactions for all-optical signal processing via quadratic nonlinearities
IEEE J. Quantum Electron. 31, 673-681 (1995)

Transistor action through nonlinear cascading in Type II interactions
Opt. Lett. 20, 1595-1597 (1995)


All-optical processing by means of Vectorial Interactions in Second-Order Cascading: Novel approaches
Opt. Lett. 19, 1720-1722 (1994)

All-Optical Switching via Second Harmonic Generation in a Nonlinearly Asymmetric Directional Coupler
Opt. Commun. 110, 599-603 (1994)

Phase Controlled Transistor Action by Cascading of Second-Order Nonlinearities
Opt. Lett. 19, 1305-1307 (1994)

Polarization spatial chaos in second harmonic generation
Opt. Lett. 19, 1825-1827 (1994)

All-optical phase controlled amplitude modulator
Electron. Lett. 30, 733-735 (1994)


Large nonlinear phase shifts in second-order nonlinear optical processes
Opt. Lett. 18, 13-15 (1993).

All Optical Switching Devices Based on Large Nonlinear Phase Shifts from Second Harmonic Generation
Appl. Phys. Lett. 62, 1323-1325 (1993)


Nonlinear Phase Shifts Using Second Order Nonlinearities
Opt. Phot. News 3, 11 (1992)


Observation of Laser-Induced Parallel Ridges in Y-cut Lithium Niobate Crystals
J. Mat. Sci. Lett. 8, 971-973 (1989)

Ti-Indiffused LiNbO3 Optical Waveguides: A Range of Different Technologies
Mat. Chem. Phys. 23, 408-415 (1989)