Publications by Author: Bacterial-biosensor

2016
Jacopo Parravicini, Eugenio DelRe, Aharon J Agranat, and Gianbattista Parravicini. 2016. “Macroscopic response and directional disorder dynamics in chemically substituted ferroelectrics..” Physical Review B: Condensed Matter & Materials Physics, 93, 9, Pp. 1 - 1. Publisher's Version Abstract
Using temperature-resolved dielectric spectroscopy in the range 25-320 K we investigate the macroscopic response, phase symmetry, and order/disorder states in bulk ferroelectric K1-yLiyTa1-xNbx (KLTN). Four long-range symmetry phases are identified with their relative transitions. Directional analysis of the order/disorder states using Fröhlich entropy indicates global symmetry breaking along the growth axis and an anisotropic dipolar effective thermodynamic behavior, which ranges from disordered to ordered at the same temperature for different directions in the sample. Results indicate that the macroscopic polarization, driven by nanosized polar regions, follows a microscopic perovskite eight-sites lattice model. [ABSTRACT FROM AUTHOR]Copyright of Physical Review B: Condensed Matter & Materials Physics is the property of American Physical Society and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Accession Number: 117488397; Parravicini, Jacopo 1,2; Email Address: jacopo.parravicini@roma1.infn.it DelRe, Eugenio 1 Agranat, Aharon J. 3 Parravicini, Gianbattista 4,5; Affiliation: 1: Dipartimento di Fisica, "Sapienza" Università di Roma, 00185 Roma, Italy 2: Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, 20125 Milano, Italy 3: Applied Physics Department, Hebrew University of Jerusalem, 91904, Israel 4: Dipartmento di Fisica, Università di Pavia, 27100 Pavia, Ita 5: IPCF-CNR, "Sapienza" Università di Roma, 00185 Roma, Italy; Source Info: Mar2016, Vol. 93 Issue 9, p1; Subject Term: PHYSICS periodicals; Subject Term: FERROELECTRIC crystals; Subject Term: BROKEN symmetry (Physics); Subject Term: LATTICE models (Statistical physics); Subject Term: FERROELECTRIC materials; People: PARRAVICINI, Jacopo; People: DELRE, Eugenio; People: AGRANAT, Aharon J.; People: PARRAVICINI, Gianbattista; Number of Pages: 1p; Document Type: Article
2015
Yossef Kabessa, Amir Yativ, Harel Ilan, and Aharon J Agranat. 2015. “Electro-Optical Modulation with Immunity to Optical Damage by Bipolar Operation in Potassium Lithium Tantalate Niobate.” Optics express , 23, 4, Pp. 4348-4356. Abstract
A method for suppressing the formation of optical damage in quadratic electrooptic devices operated at short wavelengths is presented. Formation of optical damage is attributed to the generation of a trapped space charge induced by photoionization of impurity ions by the propagating beam. It is shown that in potassium lithium tantalate niobate where the electrooptic effect is quadratic, operating the electrooptic device by a bipolar driving voltage prevents the space charge from accumulating, which inhibits the formation of the optical damage. A 6 hours continuous operation of electrooptic modulator for a 30 W/cm2 at λ = 445 nm input beam is demonstrated.
2014
Itai Hayut, Paul Ben Ishai, Aharon J Agranat, and Yuri Feldman. 2014. “Circular polarization induced by the three-dimensional chiral structure of human sweat ducts..” Physical Review. E, Statistical, Nonlinear, And Soft Matter PhysicsPhys Rev E Stat Nonlin Soft Matter Phys, 89, 4, Pp. 042715 - 042715. Publisher's Version Abstract
The upper part of the human eccrine sweat ducts, embedded within the epidermis layer, have a well-defined helical structure. It was recently suggested that, as electromagnetic entities, the sweat ducts interact with sub-mm waves [Y. Feldman et al., Phys. Rev. Lett. 100, 128102 (2008)]. Although correlation between changes in the reflectance spectrum in this frequency range and physiological activities has been shown, a direct link between the electromagnetic reflection and the helical structure itself has remained to be established. The fact that the sweat ducts manifest natural homochirality is henceforth used to produce this link. We report the detection of circular polarization asymmetry in the electromagnetic reflection from the human skin at sub-THz frequencies in vivo. We compare the results to numerical simulations and to measurements of a fabricated metamaterial. We argue that the observed circular dichroism can be interpreted uniquely as the signature of the helical structure itself. By twisting reflected electromagnetic waves, the human skin exhibits properties which are usually discussed only in the framework of metamaterial science.;
Accession Number: 24827286. Language: English. Date Created: 20140515. Date Completed: 20150415. Update Code: 20150415. Publication Type: Journal Article. Journal ID: 101136452. Publication Model: Print-Electronic. Cited Medium: Internet. NLM ISO Abbr: Phys Rev E Stat Nonlin Soft Matter Phys. Linking ISSN: 15393755. Subset: IM; Date of Electronic Publication: 2014 Apr 25. ; Original Imprints: Publication: Melville, NY : Published by the American Physical Society through the American Institute of Physics, c2001-
Shimon E Lerner, Yuri Feldman, Michal Mierzwa, Marian Paluch, Aharon J Agranat, and Paul Ben Ishai. 2014. “Multivariate pressure effects on an electron hopping process in ferroelectric K[Ta.sub.1-x][Nb.sub.x][O.sub.3].” European Physical Journal B , 7, 158. Publisher's Version
Item Citation: The European Physical Journal B - Condensed Matter and Complex Systems. July 2014, Vol. 87 Issue 7Accession Number: edsgcl.386613351; Publication Type: Academic Journal; Source: The European Physical Journal B - Condensed Matter and Complex Systems; Language: English; Publication Date: 20140701; Rights: Copyright 2014 Gale, Cengage Learning. All rights reserved.; Imprint: Springer
Sagi Frishman, Alexander Gumennik, Harel Ilan, and Aharon J Agranat. 2014. “A Bragg grating embedded in a slab waveguide fabricated by the implantation of high-energy light ions in KLTN substrate.” Applied Physics B - Lasers and Optics , 115, 1, Pp. 143-147. Publisher's Version Abstract
Electro-optically tunable transmission grating was imprinted in potassium lithium tantalate niobate by irreversible spatial patterning of the dielectric constant. While embedded into waveguided architecture, it provides a reliable and versatile building block for opto-electronic circuitry, capable of both active switching and multiplexing. Realization of such a block is critical for the fabrication of integrated photonic circuits in electro-optic substrates by means of Refractive Index Engineering by fast ion implantation.
Item Citation: Applied Physics B: Lasers and Optics. April 2014, Vol. 115 Issue 1, p143, 5 p.Accession Number: edsgcl.361133533; Publication Type: Academic Journal; Source: Applied Physics B: Lasers and Optics; Language: English; Publication Date: 20140401; Rights: Copyright 2014 Gale, Cengage Learning. All rights reserved., COPYRIGHT 2014 Springer; Imprint: Springer
2013
Noam Sapiens and Aharon J Agranat. 2013. “Full C-Band Tunable Laser based on Electroholography.” Optics Letters , 38, Pp. 2131-2133. Abstract
A tunable laser that spans the entire C band is presented. The laser consists of an Er-doped fiber amplifier gain medium, a fiber ring resonator, and an electroholography-based tuning mechanism. The electrohologram used is in the g44 configuration where the Bragg condition can be electrically tuned for a specific wavelength. Two laser architectures are presented, one in which the diffracting beam and one in which the direct beam of the electrohologram is used as the laser output. Switching time between wavelengths is limited by the gain medium relaxation time, since the electrohologram switching time is less than 1 ns.
Shani Rosen, Gabriel Y Sirat, Harel Ilan, and Aharon J Agranat. 2013. “A sub wavelength localization scheme in optical imaging using conical diffraction.” Optics Express, 21, 8, Pp. 101338. Abstract
In this paper we present a scheme for the acquisition of high temporal resolution images of single particles with enhanced lateral localization accuracy. The scheme, which is implementable as a part of the illumination system of a standard confocal microscope, is based on the generation of a vector beam that is manipulated by polarimetry techniques to create a set of illumination PSFs with different spatial profiles. The combination of data collected in different illumination states enables the extraction of spatial information obscured by diffraction in the standard imaging system. An implementation of the scheme based on the utilization of the unique phenomenon of conical diffraction is presented, and the basic strategy it provides for enhanced localization in the diffraction limited region is demonstrated.
Yossef Kabessa, Victor Korouma, Harel Ilan, Sharon Yagur-Kroll, Shimshon Belkin, and Aharon J Agranat. 2013. “Simultaneous quantification of the fluorescent responses of an ensemble of bacterial sensors..” Biosensors & Bioelectronics, 49, Pp. 394 - 398. Publisher's Version Abstract
Abstract: Bacterial bioreporters are genetically engineered microbial strains capable of detecting specific chemicals, groups of chemicals or global biological effects such as toxicity or genotoxicity. A scheme for simultaneous selective detection of the fluorescent signals emitted by a bacterial biosensor array, able to detect four different types of toxicants, using a single photodetector (photomultiplier) is presented. The underlying principle of the scheme is to convert the spatially distributed signals from all the elements in the array to temporally distributed frequency multiplexed signals at the output of the photodetector. Experimental proof of this concept is demonstrated in a four-channel system, in which low power (a few tens of picowatts) fluorescent signals produced by the bacterial sensors are measured, while maintaining a wide dynamic range of detection (more than 3 orders of magnitude). Simultaneous monitoring of concentrations down to a few mg/l of different chemicals in a liquid sample is demonstrated. [Copyright &y& Elsevier]Copyright of Biosensors & Bioelectronics is the property of Elsevier Science Publishing Company, Inc. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Accession Number: 89435767; Kabessa, Yossef 1; Email Address: yossi.kabessa@mail.huji.ac.il Korouma, Victor 1 Ilan, Har'el 1 Yagur-Kroll, Sharon 2 Belkin, Shimshon 2 Agranat, Aharon J. 1; Affiliation: 1: Department of Applied Physics and the Brojde Center for Innovative Engineering and Computer Science, The Hebrew University of Jerusalem, Jerusalem 91904, Israel 2: Department of Plant & Environmental Sciences, Institute of Life Science, The Hebrew University of Jerusalem, Jerusalem 91904, Israel; Source Info: Nov2013, Vol. 49, p394; Subject Term: BIOSENSORS; Subject Term: RECOMBINANT microorganisms; Subject Term: GENETIC toxicology; Subject Term: PHOTODETECTORS; Subject Term: IDENTIFICATION of bacteria; Subject Term: FLUORIMETRY; Author-Supplied Keyword: Bacterial whole-cell biosensors; Author-Supplied Keyword: Fluorescence; Author-Supplied Keyword: GFP reporter gene; Author-Supplied Keyword: Simultaneous sampling; Number of Pages: 5p; Document Type: Article
2012
Harel Ilan and Aharon J Agranat. 2012. “Electrically controlled absorption in a slab waveguide formed by the implantation of protons in a potassium lithium tantalate niobate substrate..” Applied Physics Letters, 101, 26, Pp. 261101. Publisher's Version Abstract
Electrically controlled absorption was observed in a slab waveguide, fabricated in a potassium lithium tantalate niobate substrate by proton implantation, at an energy of E=1.15 MeV and a fluence of 6.1×1016ions/cm2. The implantation created an amorphous layer which acted as the cladding with an adjacent proton doped layer at its bottom. It is suggested that a n-i junction is formed at the interface between the proton layer and the substrate, which is the core of the waveguide. The electrically controlled absorption is attributed to changes in the width of the depletion area of the n-i junction induced by the applied field. [ABSTRACT FROM AUTHOR]Copyright of Applied Physics Letters is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Accession Number: 84623481; Ilan, Har'el 1 Agranat, Aharon J. 1; Affiliation: 1: Department of Applied Physics and the Brojde Center for Innovative Engineering and Computer Science, The Hebrew University of Jerusalem, Jerusalem 91904,; Source Info: 12/24/2012, Vol. 101 Issue 26, p261101; Subject Term: PROTONS; Subject Term: WAVEGUIDES; Subject Term: POTASSIUM; Subject Term: LITHIUM tantalate; Subject Term: SUBSTRATES (Materials science); Number of Pages: 4p; Illustrations: 3 Diagrams, 3 Graphs; Document Type: Article
Harel Ilan, Sagi Frishman, and Aharon J Agranat. 2012. “Investigation of the conduction in an implanted layer of protons in a potassium lithium tantalate niobate substrate..” Applied Physics Letters, 101, 14, Pp. 141111. Publisher's Version Abstract
The electrical conductivity in the amorphous layer formed by the implantation of protons at 1.15 MeV with fluence of 1.1×1017 ions/cm2 within the depth of potassium lithium tantalate niobate is investigated by four probes and Hall effect measurements. It is shown that the conductivity originates from electrons that are induced by 'Hydrogen donors' that reside in a band structure 0.22 eV below the conduction band. It is claimed that this phenomenon enables the construction of conductive structures with submicron features within the depth of the substrate that can be used as embedded electrodes in electrooptical devices integrated in this substrate. [ABSTRACT FROM AUTHOR]Copyright of Applied Physics Letters is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Accession Number: 82303241; Ilan, Har'el 1 Frishman, Sagi 1 Agranat, Aharon J. 1; Affiliation: 1: Department of Applied Physics, and The Brojde Center for Innovative Engineering and Computer Science, The Hebrew University of Jerusalem, Jerusalem 91904,; Source Info: 10/1/2012, Vol. 101 Issue 14, p141111; Subject Term: ELECTRIC conductivity -- Research; Subject Term: PROTONS; Subject Term: POTASSIUM niobate; Subject Term: LITHIUM tantalate; Subject Term: LITHIUM niobate; Subject Term: SUBSTRATES (Materials science); Number of Pages: 3p; Illustrations: 1 Diagram, 1 Chart, 2 Graphs; Document Type: Article
Jacopo Parravicini, Claudio Conti, Aharon J Agranat, and Eugenio DelRe. 2012. “Programming scale-free optics in disordered ferroelectrics..” Optics Letters, 37, 12, Pp. 2355 - 2357. Publisher's Version Abstract

Using the history dependence of a dipolar glass hosted in a compositionally disordered lithium-enriched potassium tantalate niobate (KTN:Li) crystal, we demonstrate scale-free optical propagation at tunable temperatures. The operating equilibration temperature is determined by previous crystal spiralling in the temperature/cooling-rate phase space.;

Accession Number: 22739906. Language: English. Date Created: 20120628. Date Completed: 20130117. Update Code: 20141125. Publication Type: Journal Article. Journal ID: 7708433. Publication Model: Print. Cited Medium: Internet. NLM ISO Abbr: Opt Lett. Linking ISSN: 01469592. Subset: PubMed-not-MEDLINE; Date of Electronic Publication: 20120615. ; Original Imprints: Publication: New York, Optical Society of America.

2011
Heli Siman-Tov, Alexander Gumennik, Harel Ilan, Noa Mazursky, and Aharon J Agranat. 2011. “Construction of conducting and photoconducting 3D structures with submicron resolution in electrooptical substrates.” Applied Physics A - Materials Science & Processing , 102, 1, Pp. 45-48. Publisher's Version Abstract
It is shown that the implantation of protons in electrooptical substrates enables the construction of 3D structures with submicron features that are both conductive and photoconductive embedded in amorphized regions that possess reduced refractive index. The conductivity and photoconductivity are attributed to the transformation of the material into a degenerate semiconductor due to the formation of high concentration of OH.sup.- complexes that are created by the bonding of the implanted H.sup.+ ions to the O.sup.-2 ions of the lattice. It is argued that these results extend significantly the capabilities of integrated photonic circuits and devices fabricated by Refractive Index Engineering by ion implantations.
Item Citation: Applied Physics A: Materials Science & Processing. Jan 2011, Vol. 102 Issue 1, p45, 4 p.Accession Number: edsgcl.246178061; Publication Type: Academic Journal; Source: Applied Physics A: Materials Science & Processing; Language: English; Publication Date: 20110101; Rights: Copyright 2011 Gale, Cengage Learning. All rights reserved., COPYRIGHT 2011 Springer; Imprint: Springer
2008
Harel Ilan, Alexander Gumennik, Galina Perepelitsa, Abraham Israel, and Aharon J Agranat. 2008. “Construction of an optical wire imprinted in potassium lithium tantalate niobate by He+ implantation..” Applied Physics Letters, 92, 19, Pp. 192101. Publisher's Version Abstract
A channel waveguide constructed in potassium lithium tantalate niobate (KLTN) substrate by the implantation of He+ ions at 1.65 MeV is presented. The waveguide has a trapezoidal profile with a crystalline KLTN core surrounded by amorphized KLTN created by the implantation. The implantation was done through a 2 μm thick gold stopping mask with a trapezoidal groove. During the implantation, the contour of the groove was replicated beneath the surface of the substrate forming the trapezoidal cladding of the channel waveguide. The channel waveguide is designed as the interconnecting element in electro-optical integrated circuits. [ABSTRACT FROM AUTHOR]Copyright of Applied Physics Letters is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
33547454
2007
Alexander Gumennik, Har'el Ilan, Roei Fathei, Abraham Israel, Aharon J Agranat, Igal Shachar, and Michael Hass. 2007. “Design methodology of refractive index engineering by implantation of high-energy particles in electro-optic materials.” Applied Optics , 46, 19, Pp. 4132-7. Publisher's Version Abstract
Slab waveguides were constructed in [K.sub.1-x]-[Li.sub.x][Ta.sub.1-y] [Nb.sub.y][O.sub.3] crystals by the implantation of [sup.12][C.sup.+4] ions at 30 MeV and [sup.16][O.sup.+5] ions at 30 and 40 MeV. The waveguides were characterized by a prism coupler setup. A refractive index drop of 10.9% was observed in a layer formed by the implantation of [sup.16][O.sup.+5] ions at 30 MeV. The carbon-implanted waveguides were found to be thermally stable after annealing at 450 [degrees]C. A semiempirical formula for predicting the change in the refractive index given the parameters of the implantation process was developed. It is argued that the combination of the basic implantation process with the semiempirical formula can be developed to become a generic method for constructing complex electro-optic circuits with a wave-guided architecture. OCIS codes: 160.2260, 230.7400, 220.4000, 130.3120, 350.4600.
Item Citation: Applied Optics. July 1, 2007, Vol. 46 Issue 19, p4132, 6 p.Accession Number: edsgcl.165971006; Publication Type: Academic Journal; Source: Applied Optics; Language: English; Publication Date: 20070701; Rights: Copyright 2007 Gale, Cengage Learning. All rights reserved., COPYRIGHT 2007 Optical Society of America; Imprint: Optical Society of America
Aharon J Agranat, Roy Kaner, Galina Perepelitsa, and Yehudit Garcia. 2007. “Stable electro-optic striation grating produced by programed periodic modulation of the growth temperature..” Applied Physics Letters, 90, 19, Pp. 192902. Publisher's Version Abstract
Electrically controlled Bragg gratings implemented by periodic striations that were produced during the crystal growth are demonstrated in potassium lithium tantalate niobate crystals. The striations were generated by blowing air with periodic flow at the flux surface. The gratings were investigated by measurements of the diffraction efficiency versus the applied electric field. It was found that the composition grating induced correlated gratings of the refractive index and the low frequency dielectric constant. The latter, under the application of a uniform electric field, produced an electrically controlled birefringence grating through the quadratic electro-optic effect. [ABSTRACT FROM AUTHOR]Copyright of Applied Physics Letters is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
25128106
2005
Eugenio DelRe, Angelo D'Ercole, Elia Palange, and Aharon J Agranat. 2005. “Observation of soliton ridge states for the self-imprinting of fiber-slab couplers..” Applied Physics Letters, 86, 19, Pp. 191110. Publisher's Version Abstract

We investigate experimentally the energy exchange patterns and consequent propagation dynamics of an extended hybrid-dimensional interaction between a one-dimensional and a two-dimensional spatial soliton in a biased photorefractive crystal. Results show that conditions can be found in which the coupling manifests propagation invariant features. The mechanism hinges on mutual distortion through spatially nonlocal components of response, as opposed to standard wave overlap, which would lead to a diffusion of the needle into the slab mode. These nonlocal-nonlinearity-driven ridge modes represent the instrument for writing fiber-slab couplers, the key to attaining soliton-based wavelength selectivity with electroactivated features. [ABSTRACT FROM AUTHOR]Copyright of Applied Physics Letters is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

17164784

Alexander Gumennik, Aharon J Agranat, Igal Shachar, and Michael Hass. 2005. “Thermal stability of a slab waveguide implemented by α particles implantation in potassium lithium tantalate niobate..” Applied Physics Letters, 87, 25, Pp. 251917. Publisher's Version Abstract
A slab waveguide was fabricated in a potassium lithium tantalate niobate crystal by the implantation of He2+ ions at 2.26 MeV. The waveguide profile and loss were evaluated by measuring the dark mode TE spectrum using the prism coupling method at λ=1.3 μm. The implantation generated amorphous cladding layer 5 μm below the surface of the crystal with a refractive index lower by 3.9% then that of the substrate. The propagation loss of the waveguided modes was found to be 0.1–0.2 dB/cm. Thermal stability of the waveguide was obtained by isothermal annealing at 351 and 446 °C. Following the annealing the waveguide index profile remained unchanged when subjected to annealing at 150 °C for one week. [ABSTRACT FROM AUTHOR]Copyright of Applied Physics Letters is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
19316636
2004
Eugenio DelRe, Elia Palange, and Aharon J Agranat. 2004. “Fiber-launched ultratight photorefractive solitons integrating fast soliton-based beam manipulation circuitry,” 7. Publisher's Version Abstract

The deterministic and reliable singlemode fiber integration with spatial solitons through ultratight needs in photorefractives have been demonstrated. Efficient electro-optic beam handling was allowed where the fiber carried the information sequence and also delivered the photorefractively active control beam that configured the circuitry.

Item Citation: Journal of Applied Physics. April 1, 2004, Vol. 95 Issue 7, 3822-3824Accession Number: edsgcl.123305906; Publication Type: Academic Journal; Source: Journal of Applied Physics; Language: English; Publication Date: 20040401; Rights: Copyright 2004 Gale, Cengage Learning. All rights reserved.; Imprint: American Institute of Physics, Inc.

2002
Vladimir A Trepakov, Lubomir Jastrabik, Siegmar Kapphan, Enrico Giulotto, and Aharon J Agranat. 2002. “Phase transitions, related properties and possible applications of (K,Li)(Ta,Nb)O3 crystals.” Optical Materials, 19, Photonic Materials for the 21st Century. Proceedings of the 2nd International Symposium on Laser, Scintillator and Nonlinear Opt, Pp. 13 - 21. Publisher's Version Abstract
It is shown that doping the highly polarizable KTaO3 perovskite simultaneously by Li and Nb (K1−xLixTa1−yNbyO3, KLTN) gives rise to new impressive dipole ordering effects, very unusual physical properties and strong responses with respect to doping parameters. Besides, KLTN has outstanding perspectives of application in electrically controlled holographic and compositionally graded pyroelectric devices.
Accession Number: S0925346701001963; Author: Trepakov, Vladimir A. (a, ∗); Author: Jastrabik, Lubomir (b); Author: Kapphan, Siegmar (c); Author: Giulotto, Enrico (d); Author: Agranat, Aharon J. (e); Affiliation: A.F. Ioffe Physical and Technical Institute, 194 021 St. Petersburg, Russia; Affiliation: Institute of Physics AS CR, 182 21 Praha 8, Czech Republic; Affiliation: FB Physik, University of Osnabrück, 49069 Osnabrück, Germany; Affiliation: Dipartimento di Fisica “A. Volta”, Università di Pavia and INFM, 27100 Pavia, Italy; Affiliation: Department of Applied Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel; Number of Pages: 9; Language: English;
2001
Aharon J Agranat, Lavi Secundo, Noam Golshani, and Meir Razvag. 2001. “Wavelength-selective photonic switching in paraelectric potassium lithium tantalate niobate.” Optical Materials, 18, 1, Pp. 195 - 197. Publisher's Version Abstract
A generic wavelength-selective switching method is presented. The method is based on the voltage-controlled photorefractive effect in paraelectric crystals. The switch consists of a crystal at the paraelectric phase in which a space charge grating was stored by a photorefractive process. Diffraction occurs by the application of a uniform electric field that causes the space charge grating to induce an index grating. Results of the diffraction efficiency as a function of the applied field and the time dependence of the diffracted beam are presented. The performance envelop of a switch based on this effect is briefly discussed.
Accession Number: S0925346701001665; Author: Agranat, Aharon J. (a, ∗); Author: Secundo, Lavi (a); Author: Golshani, Noam (a); Author: Razvag, Meir (b); Affiliation: Department of Applied Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel; Affiliation: Trellis Photonics Ltd., Jerusalem Technology Park, Jerusalem 96951, Israel; Number of Pages: 3; Language: English;

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