Publications by Year: 2013

2013
J Parravicini, D Pierangeli, F Di Mei, C Conti, AJ Agranat, and E DelRe. 2013. “Aging solitons in photorefractive dipolar glasses..” Optics Express, 21, 25, Pp. 30573 - 30579. Publisher's Version Abstract

We study experimentally the aging of optical spatial solitons in a dipolar glass hosted by a nanodisordered sample of photorefractive potassium-sodium-tantalate-niobate (KNTN). As the system ages, the waves erratically explore varying strengths of the nonlinear response, causing them to break up and scatter. We show that this process can still lead to solitons, but in a generalized form for which the changing response is compensated by changing the normalized wave size and intensity so as to maintain fixed the optical waveform.;

Accession Number: 24514634. Language: English. Date Created: 20140211. Date Completed: 20141028. Update Code: 20141125. Publication Type: Journal Article. Journal ID: 101137103. Publication Model: Print. Cited Medium: Internet. NLM ISO Abbr: Opt Express. Linking ISSN: 10944087. Subset: PubMed-not-MEDLINE; Date of Electronic Publication: 20131216. ; Original Imprints: Publication: Washington, DC : Optical Society of America, 1997-

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.
I Hayut, A Puzenko, P Ben Ishai, A Polsman, AJ Agranat, and Y Feldman. 2013. “The helical structure of sweat ducts: Their influence on the electromagnetic reflection spectrum of the skin.” IEEE Transactions on Terahertz Science and Technology, 3, 2, Pp. 207-215. Publisher's Version
Accession Number: edselc.2-52.0-84874988433; (IEEE Transactions on Terahertz Science and Technology, 2013, 3(2):207-215) Publication Type: Academic Journal; Rights: Copyright 2013 Elsevier B.V., All rights reserved.
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