Tesfaye Gebre

Florida Agricultural and Mechanical University

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Ashok K. Batra

Alabama Agricultural and Mechanical University

Matthew Edwards

Alabama Agricultural and Mechanical University

Ravindra B. Lal

Salem State University

Mohan D. Aggarwal

Alabama Agricultural and Mechanical University

James H. Dickerson

Brookhaven National Laboratory

Kamala N. Bhat

Alabama Agricultural and Mechanical University

R. B. Lal

Northwest Missouri State University

Donald O. Frazier

Marshall Space Flight Center

Benjamin G. Penn

University of Utah

A. Kebede

North Carolina Agricultural and Technical State University

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Texas A&M University

Alabama Agricultural and Mechanical University

National High Magnetic Field Laboratory

Florida State University

Vanderbilt University

Marshall Space Flight Center

North Carolina Agricultural and Technical State University

Brookhaven National Laboratory

Oak Ridge National Laboratory

University of Alabama in Huntsville

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Electrooptic characterization and Czochralski growth technique of pure and doped lithium niobate crystals

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2004)

Tesfaye Gebre D. Edwards Manmohan D. Aggarwal A. K. Batra Matthew Edwards

Ferroelectric Lithium Niobate (LN) possesses a combination of unique electrooptic, piezoelectric, pyroelectric, and photorefractive properties. These features make it suitable for applications in optical devices-as modulators, switches, and filters in communication systems and holographic recording medium, etc. Here, the growth of lithium Niobate doped with iron and doubly doped with iron and manganese ions will be described. The growth technique will be through Automatic Diameter Control Czochralski Design. From these grown crystals, critical electrooptical coefficients using null detection polarimetry are provided. The results of growth, electrooptic measurements, and some physical properties are compared and presented. Also, the use of doped LN crystals in devices is discussed.

Characterization

10.1117/12.559956

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Citations (2)

<title>Growth of nonlinear optical materials at Alabama A&M University</title>

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2002)

Mohan D. Aggarwal Tesfaye Gebre Ashok K. Batra Matthew Edwards Ravindra B. Lal

Photonics/laser related technologies and applications rely on a steady supply of device quality single crystals. For more than a decade, the main focus has been on high performance nonlinear optical materials that comply with device manufacturing and end-use conditions such as high performance, high thermal, mechanical and chemical stability. To this end a variety of organic and semi-organic NLO materials have been successfully synthesized, purified and grown into bulk single crystals. In the process of growing bulk single crystals, various novel techniques and processes have been developed. In this presentation, results of synthesis and crystal growth processing of the various NLO materials such as methyl-(2,4-dinitrophenyl)-aminopropionate: 2-methyl-4-nitroaniline (MAP:MNA), L-arginine phosphate, L-Histidine tetrafluoroborate, L-arginie tetrafluoroborate and other isomorphs, pure and doped Bismuth silicon oxide, pure and doped Lithium niobate crystals will be discussed including challenges faced, novel techniques and experimental set-ups developed in growing large high quality crystals.

Bismuth

Tetrafluoroborate

10.1117/12.452409

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Electrophoretic Deposition of Metal Nanoparticle Monolayers from Nonpolar Solvents for Hydrogen Sensing

Key engineering materials (2015)

Jan Grym Roman Yatskiv Ondřej Černohorský M. Verde Jan Lörinčı́k

We report on the electrophoretic deposition (EPD) of metal nanoparticles (NPs) prepared in reverse micelles on semiconductor substrates with the aim to fabricate sensitive Schottky-based hydrogen sensors with fast response and high degree of selectivity. We discuss the mechanism of NP monolayer formation and show which parameters are essential for the transition from three-dimensional to two-dimensional growth.

Electrophoretic Deposition

Deposition

10.4028/www.scientific.net/kem.654.213

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Citations (1)

Time-resolved Optical Study of Charge-ordered Manganites.

Bulletin of the American Physical Society (2009)

T. Tokumoto Judy Cherian Ryan deRosa Paula Sahanggamu Sanhita Ghosh

Charge ordering

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Growth and characteristics of organic and semiorganic nonlinear optical crystals

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2004)

Ashok K. Batra Tesfaye Gebre Kamala N. Bhat M. D. Aggarwal Burl H. Peterson

The growth, synthesis and characteristics of a new organic nonlinear optical crystal, a derivative of Schiff base compounds, 4-nitrobenzylidene-4-chloroaniline are reported. Good-quality crystals have been successfully grown using Bridgman-Stockbarger (BS) Technique. The organic crystal, 4-nitrobenzylidene-4-chloroaniline, shows good second harmonic generation of 1.064 micron wavelength. A recent work done on the semiorganic nonlinear crystals are reviewed along with results of growth of a few L-arginine phosphate type crystals is presented.

Crystal (programming language)

Derivative (finance)

10.1117/12.529577

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Synthesis and superconducting properties of FeTe1-xSe Single Crystals under high magnetic fields

Bulletin of the American Physical Society (2011)

Tesfaye Gebre G. Li Jeffrey B. Whalen Benjamin S. Conner M. K. Kostov

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DC Magnetization and Growth of Heavy-Fermion Superconductor CeCoIn$_{5 }$and CeIn$_{3}$ Crystal

Bulletin of the American Physical Society (2008)

Tesfaye Gebre Eric Palm S. W. Tozer Tim Murphey Ju‐Hyun Park

Heavy fermion superconductor

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Nanoporous TiO2 nanoparticle assemblies with mesoscale morphologies: nano-cabbage versus sea-anemone

Nanoscale (2014)

Masih Darbandi Tesfaye Gebre Lucas A. Mitchell William R. Erwin Rizia Bardhan

We report the novel synthesis of nanoporous TiO2 nanoparticle ensembles with unique mesoscale morphologies. Constituent nanoparticles evolved into multifaceted assemblies, exhibiting excellent crystallinity and enhanced photocatalytic activity compared with commercial TiO2. Such materials could be exploited for applications, like organic pollutant degradation.

Nanoporous

Degradation

Sea anemone

10.1039/c3nr06154j

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Citations (11)

Structural and superconducting flux-pinning effects of self-assembled CeO2 nanodots on laser ablated YBa2Cu3O7 single layer thin films

Bulletin of the American Physical Society (2007)

Talisha Haywood Dhananjay Kumar A. Kebede Jeremiah T. Abiade Tesfaye Gebre

Nanodot

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Pyroelectric Properties of Pure and Doped Lithium Niobate Crystals for Infrared Sensors

Ferroelectrics Letters Section (2004)

Tesfaye Gebre Ashok K. Batra Padmaja Guggilla Mohan D. Aggarwal Ravindra B. Lal

The present study is an attempt to quantify and assess the effects of different dopants such as Fe, Fe/Mn and Eu on the growth, dielectric and pyroelectric properties of lithium niobate single crystals. Investigations reveal that Lithium niobate crystals, when doped with Fe ions, exhibits higher material figures of merit, for using in pyroelectric infrared sensing devices and vidicons applications with wider operating temperature range, as compared to other available pyroelectric crystals.

Pyroelectric crystal

Figure of Merit

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Atmospheric temperature range

10.1080/07315170490901436

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Citations (18)