Yu. A. Barnakov

Norfolk State University

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M. A. Noginov

Norfolk State University

Evgenii E. Narimanov

Purdue University West Lafayette

M. Mayy

Norfolk State University

T. U. Tumkur

Lawrence Livermore National Laboratory

Hangyu Li

China University of Petroleum, East China

G. Zhu

Nanjing University of Aeronautics and Astronautics

Guohua Zhu

University of Chinese Academy of Sciences

Vladimir Poborchii

National Institute of Advanced Industrial Science and Technology

A. Kasuya

Tohoku University

Zubin Jacob

Purdue University West Lafayette

Cooperative Institutions

Norfolk State University

Tohoku University

Purdue University West Lafayette

Russian Academy of Sciences

University of New Orleans

Sendai University

Princeton University

Taras Shevchenko National University of Kyiv

Physico-Technical Institute

University of Illinois Urbana-Champaign

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Optical study of ZnP2 nanoparticles in zeolite Na–X

Solid State Communications (2004)

Oleg A. Yeshchenko Igor Dmitruk S. V. Koryakov Iryna Pundyk Yu. A. Barnakov

Stokes shift

Blueshift

Crystal (programming language)

Absorption band

10.1016/j.ssc.2004.10.007

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Citations (22)

Experimental Probing of Photonic Density of States in Hyperbolic Metamaterial

M. A. Noginov Hangyu Li Daniel M. Dryden G. Nataraj Yu. A. Barnakov

In the metamaterial with hyperbolic dispersion (an array of silver nanowires in alumina membrane) we have observed six-fold reduction of the emission life-time of dye deposited onto the metamaterials surface. This serves as the evidence of the earlier predicted high density of photonic states in hyperbolic metamaterials.

Photonic metamaterial

10.21236/ada523097

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Selenium clusters in the microcavities of a chabasite crystal

PhSS (1995)

Yu. A. Barnakov Vladimir Poborchii Andrey Shchukarev

Crystal (programming language)

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The progress towards the transparent ceramics fabrication

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2007)

Yu. A. Barnakov Mark Thomas Z. Kabato G. Zhu M. Bahoura

We discuss major factors responsible for obtaining transparent Nd³⁺:YAG ceramic, a prospective material for laser applications. The relationship between the properties of starting nanopowders and the transmittance of specimens sintered at the different "ramp-soak" conditions was established by means of spectroscopic, structural, and electronic microscopy studies. It was found, that sample's transmittance (in some cases) depends on the duration of the holding time at the sintering stage. This result is promising for obtaining laser quality materials. It also contributes to basic understanding of the processes underlying fabrication of transparent laser ceramic.

Transparent ceramics

Selective laser sintering

10.1117/12.721328

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Magneto-optical spectra of closely spaced magnetite nanoparticles

Journal of Applied Physics (2005)

Damon A. Smith Yu. A. Barnakov Byron L. Scott Sarah A. White Kevin L. Stokes

The Faraday rotation spectrum of composites containing magnetite nanoparticles is found to be dependent on the interparticle spacing of the constituent nanoparticles. The composite materials are prepared by combining chemically synthesized Fe3O4 (magnetite) nanoparticles (8-nm diameter) and poly(methylmethacrylate). Composites are made containing a range of nanoparticle concentrations. The peak of the main spectral feature depends on nanoparticle concentration; this peak is observed to shift from approximately 470 nm for (dilute composites) to 540 nm (concentrated). We present a theory based on the discrete-dipole approximation which accounts for optical coupling between magnetite particles. Qualitative correlations between theoretical calculations and experimental data suggest that the shifts in spectral peak position depend on both interparticle distance and geometrical configuration.

Magnetite Nanoparticles

Discrete dipole approximation

10.1063/1.1847352

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Control of spontaneous emission with functionalized multilayered hyperbolic metamaterials

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2011)

T. U. Tumkur Guohua Zhu P.W. Black Yu. A. Barnakov Carl E. Bonner

The behavior of spontaneous emission of emitters embedded inside metamaterials with hyperbolic dispersion has been investigated. A simple technique has been developed to fabricate lamellar metal-dielectric hyperbolic metamaterials on substrates which can be flat, flexible or curvilinear in geometry. Moreover, this method opens up the possibility of functionalizing the dielectric layers by dye molecules. Utilizing this technique, we study the spontaneous emission kinetics of emitters placed either on top, or embedded inside hyperbolic metamaterials. While we observe a reduction in the radiative lifetimes in both cases, owing to the singularity in the density of photonic states, the effect is much stronger when the dye molecules are inside the metamaterial, rather than on its surface.

10.1117/12.896033

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Role of dipole–dipole interactions in half-field quantum transitions in magnetic nanoparticles

Journal of Magnetism and Magnetic Materials (2011)

Н. Ногинова Yu. A. Barnakov Adrian Radocea В. А. Ацаркин

Superparamagnetism

10.1016/j.jmmm.2011.03.042

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Citations (10)

Optical, electric and photoelectric properties of pure and CdS or CuCI cluster doped zeolite single crystals

Studies in surface science and catalysis (1994)

Yu. A. Barnakov M. S. Ivanova Vitalii Petranovskii Vladimir Poborchii V.G. Soloviev

Photoelectric effect

Base (topology)

10.1016/s0167-2991(08)64086-0

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Spectral dependence of Faraday rotation in magnetite-polymer nanocomposites

Journal of Physics and Chemistry of Solids (2004)

Yu. A. Barnakov Byron L. Scott V. Golub Lisa A. Kelly ‬V. Raghavendra Reddy

10.1016/j.jpcs.2003.10.070

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Citations (45)

Development of composite silver-polymer metamaterials

Conference on Lasers and Electro-Optics (2008)

M. Mayy G. Zhu Yu. A. Barnakov M. A. Noginov

We have synthesized and studied a series of composite silver-polymer photonic metamaterials with composition-tunable electric permittivity epsiv. The demonstrated value epsivpsila = 12.8 at lambda = 2.4 mum appears to be the highest in the near-to-mid-IR spectral range.

Photonic metamaterial

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