Accession Number: edselc.2-52.0-84866336071; (Applied Physics Letters, 10 September 2012, 101(11)) Publication Type: Academic Journal; Rights: Copyright 2012 Elsevier B.V., All rights reserved.
We demonstrate the use of three-dimensional funnel index of refraction patterns analogous to those of retinal Muller cells as support for tunable and multi-functional volume optical component miniaturization and integration. Our experiments in paraelectric photorefractive crystals show how a single funnel can act both as a waveguide and a tunable focusing/defocusing micro-lens. Pairing multiple funnel patterns, we are also able to demonstrate ultra-compact tunable beam-splitting, with distinct guided output modes in under 1mm of propagation. (C) 2012 Optical Society of America
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
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
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.
We demonstrate rejuvenation in scale-free optical propagation. The phenomenon is caused by the non-ergodic relaxation of the dipolar glass that mediates the photorefractive nonlinearity in compositionally-disordered lithium-enriched potassium-tantalate-niobate (KTN:Li). We implement rejuvenation to halt aging in the dipolar glass and extend the duration of beam diffraction cancellation. (C) 2012 Optical Society of America
Recent work has demonstrated that the reflection coefficient of human skin in the frequency range from 95 to 110?GHz (W band) mirrors the temporal relaxation of stress induced by physical exercise. In this work, we extend these findings to show that in the event of a subtle trigger to stress, such as mental activity, a similar picture of response emerges. Furthermore, the findings are extended to cover not only the W band (75-110?GHz), but also the frequency band from 110 to 170?GHz (D band). We demonstrate that mental stress, induced by the Stroop effect and recorded by the galvanic skin response (GSR), can be correlated to the reflection coefficient in the aforementioned frequency bands. Intriguingly, a light physical stress caused by repeated hand gripping clearly showed an elevated stress level in the GSR signal, but was largely unnoted in the reflection coefficient in the D band. The implication of this observation requires further validation. Bioelectromagnetics 33:375382, 2012. (C) 2011 Wiley Periodicals, Inc.
