Daniele Eugenio LUCCHETTA

Pubblicazioni

Daniele Eugenio LUCCHETTA

 

121 pubblicazioni classificate nel seguente modo:

Nr. doc. Classificazioni
87 1 Contributo su Rivista
23 4 Contributo in Atti di Convegno (Proceeding)
6 2 Contributo in Volume
5 6 Brevetti
Anno
Risorse
2001
Light-Controlled Anchoring Energy in Nematic Liquid Crystals
MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY. SECTION A, MOLECULAR CRYSTALS AND LIQUID CRYSTALS
Autore/i: Francescangeli, Oriano; Lucchetta, Daniele Eugenio; Y., Reznikov; S., Slussarenko; Simoni, Francesco
Classificazione: 1 Contributo su Rivista
Abstract: In this paper we show the possibility of regulating the dose of the anchoring energy under the control of the incident light. Using a dye-doped nematic sample where it was previously demonstrated the effect of light-induced anchoring, we measured the threshold for the Fredericksz transition for different irradiation times using a low power laser beam. Our data compare favourably to the existing theory and show that the amount of induced anchoring energy increases linearly with the irradiation time.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51323 Collegamento a IRIS

2001
On the origin of the huge nonlinear response of dye-doped liquid crystal
OPTICS EXPRESS
Autore/i: Simoni, Francesco; Lucchetti, Liana; Lucchetta, Daniele Eugenio; Francescangeli, Oriano
Classificazione: 1 Contributo su Rivista
Abstract: We report the results of an investigation carried on Methyl Red-doped nematic liquid crystals with the aim of studying the basic mechanism of the extraordinarily large nonlinear response recently reported. We show that the experimental data can be explained as due to light-induced modifications of the anchoring conditions leading to director reorientation on the irradiated surface, which in turn gives rise to a bulk reorientation through the cell. We have called this phenomenon SINE (Surface Induced Nonlinear Effect) to remind that it occurs "without" (= sine in latin language) a direct optical or electric torque on the director in the bulk.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51304 Collegamento a IRIS

2001
Liquid crystalline materials for spatial light modulation
Proceedings of SPIE
Autore/i: Lucchetti, Liana; Lucchetta, Daniele Eugenio; R., Karapinar; A. MANNI AND F., Simoni
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/45967 Collegamento a IRIS

2001
Optical Nonlinearities of Liquid Crystals Controlled by Surfaces
Spatial Light Modulators: Technology and Applications
Autore/i: Lucchetti, Liana; Lucchetta, Daniele Eugenio; Francescangeli, Oriano; Simoni, Francesco
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: We show that light-induced modification of the anchoring conditions can lead to an extraordinarily large optical response in dye-doped nematic liquid crystals. The bulk reorientation due to the collective elastic behavior of the liquid crystal is the origin of the nonlinearity, which occurs without a direct optical torque on the molecular director in the bulk. We call this effect SINE (Surface Induced Nonlinear Effect). These results can also explain the origin of the supranonlinear behavior recently observed in the same composites.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53287 Collegamento a IRIS

2001
Morphological and electro-optical properties of polymer dispersed liquid crystals cured by high intensity laser radiation
MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY. SECTION A, MOLECULAR CRYSTALS AND LIQUID CRYSTALS
Autore/i: Lucchetta, Daniele Eugenio; Francescangeli, Oriano; Lucchetti, Liana; L., Gobbi; Simoni, Francesco
Editore: Gordon & Breach Science Publishers:PO Box 90, Reading RG1 8JL United Kingdom:011 44 118 9520303, 011 44 118 9560080, 011 44 181 9560080, EMAIL: philip.bott@gbmis.gbhap.com, INTERNET: http://www.gbhap.com/pubdate, Fax: 011 44 118 9568211
Classificazione: 1 Contributo su Rivista
Abstract: We have studied the morphology and the electrooptical properties of Polymer Dispersed Liquid Crystals prepared by the Polymer Induced Phase Separation technique under high-intensity UV laser curing. Photoinduced thermal convective motions have been observed in the directly illuminated area, which originates unusual morphological patterns consisting of ordered and/or disordered structures, depending on the curing intensity. We show that transition between ordered (columnar) and disordered (turbulent) motion is possible by increasing the laser beam intensity and the flow patterns associated to both these regimes can be frozen in by the photo-polymerization process. We show also that localized high-intensity curing generates a gradient of the droplet-size distribution outside the directly irradiated area essentially due to the non-uniform spatial-distribution of scattered intensity. This complex morphology reflects into a peculiar electrooptical behavior that could find potential application in new optical devices.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/27138 Collegamento a IRIS

2001
Droplet-size distribution gradient induced by laser curing in polymer dispersed liquid crystals
LIQUID CRYSTALS
Autore/i: Lucchetta, Daniele Eugenio; Francescangeli, Oriano; Lucchetti, Liana; Simoni, Francesco
Classificazione: 1 Contributo su Rivista
Abstract: We have studied the morphology and electro-optical properties of polymer dispersed liquid crystals prepared by polymerization-induced phase separation (PIPS) under high intensity UV laser curing. The results have shown that localized high intensity curing generates a gradient of the droplet size distribution outside the directly irradiated area as a consequence of the non-uniform spatial distribution of the scattered intensity. Such a distribution of the droplet size reflects in a peculiar electro-optical behaviour that could find potential application in optical devices. Both shape and spatial extent of the droplet size gradient are affected by the spatial velocity of polymerization which in turn strongly depends on the intensity of the curing laser beam. This dependence has also been experimentally investigated.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/50976 Collegamento a IRIS

2000
Thermally Induced Depolarization Currents In a Palladium Containing Metallorganic Liquid Crystal
MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY. SECTION A, MOLECULAR CRYSTALS AND LIQUID CRYSTALS
Autore/i: M. C., Pagnotta; N., Scaramuzza; G., Strangi; Lucchetta, Daniele Eugenio; Ionescu, C. C. VERSACE AND A. T. H.
Editore: Taylor & Francis Limited:Rankine Road, Basingstoke RG24 8PR United Kingdom:011 44 1256 813035, EMAIL: madeline.sims@tandf.co.uk, info@tandf.co.uk, INTERNET: http://www.tandf.co.uk, Fax: 011 44 1256 330245
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/36319 Collegamento a IRIS

2000
Impurities In Nematic Liquid Crystal Samples Inducing Changes In The DSM1-DSM2 Transition Phase Diagram
LIQUID CRYSTALS
Autore/i: Lucchetta, Daniele Eugenio; N., Scaramuzza; G., Strangi; C., Versace
Editore: Taylor & Francis Limited:Rankine Road, Basingstoke RG24 8PR United Kingdom:011 44 1256 813035, EMAIL: madeline.sims@tandf.co.uk, info@tandf.co.uk, INTERNET: http://www.tandf.co.uk, Fax: 011 44 1256 330245
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/36318 Collegamento a IRIS

1999
Metodo per la fabbricazione di elementi elettroottici nematici (caso 1)
Autore/i: G., Strangi; N., Scaramuzza; E., Cazzanelli; C., Versace; R., Bartolino; Lucchetta, Daniele Eugenio; A., Pennisi; F., Simone
Classificazione: 6 Brevetti
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/48670 Collegamento a IRIS

1999
Turbulent to Turbulent Transition in Homeotropically Aligned Nematic Liquid Crystals
PHYSICAL REVIEW E
Autore/i: Lucchetta, Daniele Eugenio; N., Scaramuzza; G. STRANGI AND C., Versace
Editore: American Institute of Physics:2 Huntington Quadrangle, Suite 1NO1:Melville, NY 11747:(800)344-6902, (631)576-2287, EMAIL: subs@aip.org, INTERNET: http://www.aip.org, Fax: (516)349-9704
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/36315 Collegamento a IRIS

1999
Asymmetric electro-optic response in a liquid crystal cell containing a layer of amorphous tungsten trioxide
APPLIED PHYSICS LETTERS
Autore/i: G., Strangi; Lucchetta, Daniele Eugenio; E., Cazzanelli; N., Scaramuzza; C. VERSACE AND R., Bartolino
Editore: American Institute of Physics:2 Huntington Quadrangle, Suite 1NO1:Melville, NY 11747:(800)344-6902, (631)576-2287, EMAIL: subs@aip.org, INTERNET: http://www.aip.org, Fax: (516)349-9704
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/36316 Collegamento a IRIS

1999
Polarity Sensitive Electrooptical Response in a Nematic Liquid Crystal-Polymer Mixture
JOURNAL OF APPLIED PHYSICS
Autore/i: R., Bartolino; N., Scaramuzza; Lucchetta, Daniele Eugenio; E. S., Barna; Blinov, A. T. H. IONESCU AND L. M.
Editore: American Institute of Physics:2 Huntington Quadrangle, Suite 1NO1:Melville, NY 11747:(800)344-6902, (631)576-2287, EMAIL: subs@aip.org, INTERNET: http://www.aip.org, Fax: (516)349-9704
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/36317 Collegamento a IRIS

1999
Metodo per la fabbricazione di elementi elettroottici nematici (caso 2)
Autore/i: R., Bartolino; N., Scaramuzza; Lucchetta, Daniele Eugenio; G., Strangi; C., Versace; E. S., Barna; A. T., Ionescu; L. M., Blinov
Classificazione: 6 Brevetti
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/48664 Collegamento a IRIS

1999
Photopolarimetric characterization of the transition between the turbulent states in a nematic liquid crystal film
PHYSICAL REVIEW E
Autore/i: G., Strangi; N., Scaramuzza; C., Versace; Lucchetta, Daniele Eugenio; R., Bartolino
Editore: American Institute of Physics:2 Huntington Quadrangle, Suite 1NO1:Melville, NY 11747:(800)344-6902, (631)576-2287, EMAIL: subs@aip.org, INTERNET: http://www.aip.org, Fax: (516)349-9704
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/36314 Collegamento a IRIS

1998
Electric field induced turbulent to turbulent transition in homeotropic Nematic Liquid Crystal cells
NUOVO CIMENTO DELLA SOCIETÀ ITALIANA DI FISICA. D CONDENSED MATTER, ATOMIC, MOLECULAR AND CHEMICAL PHYSICS, BIOPHYSICS
Autore/i: Lucchetta, Daniele Eugenio; N., Scaramuzza; C., Versace
Editore: Societa Italiana di Fisica:Via Saragozza 12 Subs Service, I 40123 Bologna Italy:011 39 051 331554, EMAIL: sif@sif.it, INTERNET: http://www.sif.it, Fax: 011 39 051 581340
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/36313 Collegamento a IRIS

1997
Scaling laws of dielectric testing particles subject to randomly distributed vortices in electro-convective turbulence
The Physics of Complex Systems
Autore/i: Lucchetta, Daniele Eugenio; V., Carbone; N., Scarmuzza; C., Versace
Editore: IOS Press
Luogo di pubblicazione: AMSTERDAM
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/42772 Collegamento a IRIS

1996
Anomalous Levy Processes and Sign-Singularity in Electro-Convective Turbulence
Nonlinear Physics theory and experiment
Autore/i: Lucchetta, Daniele Eugenio
Editore: World Scientific Publishing Co. Pte. Ltd.
Luogo di pubblicazione: SINGAPORE
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/42770 Collegamento a IRIS

1995
Sign-Singular Measures in Random Field : an Example from Dielectric Testing Particles in Electro-Convective Turbulence
EUROPHYSICS LETTERS
Autore/i: V., Carbone; Lucchetta, Daniele Eugenio; N., Scaramuzza; C., Versace
Editore: EDP Sciences:17 Ave Du Hoggar, BP112, 91944 Les Ulis Cedex A France:011 33 1 69187575, EMAIL: subscribers@edpsciences.com, INTERNET: http://www.edpsciences.com, Fax: 011 33 1 69860678
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/36312 Collegamento a IRIS

1994
Diffusion of Testing Particles in Turbulent Nematic Liquid Crystals
NUOVO CIMENTO DELLA SOCIETÀ ITALIANA DI FISICA. D CONDENSED MATTER, ATOMIC, MOLECULAR AND CHEMICAL PHYSICS, BIOPHYSICS
Autore/i: C., Versace; V., Carbone; N., Scaramuzza; Lucchetta, Daniele Eugenio
Editore: Societa Italiana di Fisica:Via Saragozza 12 Subs Service, I 40123 Bologna Italy:011 39 051 331554, EMAIL: sif@sif.it, INTERNET: http://www.sif.it, Fax: 011 39 051 581340
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/36311 Collegamento a IRIS

1993
Study of the Viscoelastic Properties of the Metallorganic Palladium Mesogens Azpac and Azpac2 by Photons Self-Beating Spectroscopy
THE JOURNAL OF CHEMICAL PHYSICS
Autore/i: C., Versace; V., Formoso; Lucchetta, Daniele Eugenio; D., Pucci; C., Ferrero; M., Ghedini; R., Bartolino
Editore: American Institute of Physics:2 Huntington Quadrangle, Suite 1NO1:Melville, NY 11747:(800)344-6902, (631)576-2287, EMAIL: subs@aip.org, INTERNET: http://www.aip.org, Fax: (516)349-9704
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/36310 Collegamento a IRIS

1992
Refractive Index Measurements of the Palladium Complexed Liquid Crystal A’Pd2
MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY. SECTION A, MOLECULAR CRYSTALS AND LIQUID CRYSTALS
Autore/i: C., Versace; G., Cipparrone; Lucchetta, Daniele Eugenio; D., Pucci; M., Ghedini
Editore: Taylor & Francis Limited:Rankine Road, Basingstoke RG24 8PR United Kingdom:011 44 1256 813035, EMAIL: madeline.sims@tandf.co.uk, info@tandf.co.uk, INTERNET: http://www.tandf.co.uk, Fax: 011 44 1256 330245
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/36309 Collegamento a IRIS




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