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Hoa D.Q.,Hanoi University of Science and Technology | Duong V.,Institute of Physics and Electronics | Duong V.T.T.,Institute of Physics and Electronics | Ha C.V.,Institute of Physics and Electronics
Applied Physics B: Lasers and Optics | Year: 2012

We report a new configuration of a picosecond distributed feedback dye laser system, which can be pumped by various wavelengths. The optical characteristics of the system are presented. By using a triangle mirror functioned beam splitter and a right-angle prism attached to the front face of the cell in the pumping geometry, continuously and widely tunable laser wavelengths have been obtained for a range of more than 100 nm. A quenching mirror adhered to a face on the side of the cell, functioning as a high-Q cavity shared common gain medium, has been employed to observe single short laser pulses with transform-limited bandwidth. © 2012 Springer-Verlag.


Poklonski N.A.,Belarusian State University | Kislyakov E.F.,Belarusian State University | Vyrko S.A.,Belarusian State University | Hieu N.N.,Institute of Physics and Electronics | And 6 more authors.
Journal of Nanophotonics | Year: 2010

Structural and energy characteristics of the smallest magnetic endofullerene Fe@C20 have been calculated using the density functional theory approach. The ground state of Fe@C20 is found to be a septet state, and the magnetic moment of Fe@C20 is estimated to be 8 Bohr magnetons. Characteristics of an (8,8) carbon nanotube with a single Fe@C20 inside are studied in the framework of the semiempirical approach. The scheme of a magnetic nanorelay based on cantilevered nanotubes filled with magnetic endofullerenes is elaborated. The proposed nanorelay is turned on as a result of bending of nanotubes by a magnetic force. Operational characteristics of such a nanorelay based on (8,8) and (21,21) nanotubes fully filled with Fe@C20 are estimated and compared to the ones of a nanorelay made of a (21,21) nanotube fully filled with experimentally observed (Ho3N)@C80 with the magnetic moment of 21 Bohr magnetons. Room temperature operation of (21,21) nanotube based nanorelays is shown. © 2010 Society of Photo-Optical Instrumentation Engineers.


Poklonski N.A.,Belarusian State University | Ratkevich S.V.,Belarusian State University | Vyrko S.A.,Belarusian State University | Kislyakov E.F.,Belarusian State University | And 5 more authors.
Chemical Physics Letters | Year: 2012

The atomic and band structures of the (6, 0) zigzag carbon nanotube at its axial elongation are calculated by semiempirical molecular orbital and by tight-binding methods. The ground state of the nanotube is found to have a Kekule structure with four types of bonds and difference between lengths of long and short bonds of about 0.005 nm. The structural phase transition is revealed at ≈9% elongation, resulting in a quinoid structure with two types of bonds. This structural phase transition is followed by the transition from a narrow gap to moderate gap semiconductor. Validity of the semiempirical PM3 method is discussed. © 2012 Elsevier B.V. All rights reserved.


Poklonski N.A.,Belarusian State University | Vyrko S.A.,Belarusian State University | Kislyakov E.F.,Belarusian State University | Hieu N.N.,North Carolina Central University | And 6 more authors.
Nanoscale Research Letters | Year: 2011

The changes of dynamical behaviour of a single fullerene molecule inside an armchair carbon nanotube caused by the structural Peierls transition in the nanotube are considered. The structures of the smallest C20 and Fe@C20 fullerenes are computed using the spin-polarized density functional theory. Significant changes of the barriers for motion along the nanotube axis and rotation of these fullerenes inside the (8,8) nanotube are found at the Peierls transition. It is shown that the coefficients of translational and rotational diffusions of these fullerenes inside the nanotube change by several orders of magnitude. The possibility of inverse orientational melting, i.e. with a decrease of temperature, for the systems under consideration is predicted. © 2011 Poklonski et al.


Poklonski N.A.,Belarusian State University | Kislyakov E.F.,Belarusian State University | Hieu N.N.,Institute of Physics and Electronics | Vyrko S.A.,Belarusian State University | And 2 more authors.
Computational Materials Science | Year: 2010

The influence of bond length dimerization due to Peierls distortions on totally symmetric vibrations of armchair carbon nanotubes is considered theoretically. It is shown that the radial and tangential motions for quinoid type dimerization are mixed and the radial breathing mode for Kekule type dimerization is splitted. © 2010 Elsevier B.V. All rights reserved.

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