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Group leader - Professor Dumitru Mihalache


Google Scholar profile: Dumitru Mihalache

Nonlinear Optics and Photonics Group is part of the Department of Theoretical Physics at The National Institute for Physics and Nuclear Engineering “Horia Hulubei”

Prof. Dumitru Mihalache is one of the two recipients of the 2009 Galileo Galilei Award of the International Commission for Optics (ICO), see Galileo Galilei award and medal.

In recognition of his scientific contributions "made under comparatively unfavourable circumstances", the award committee granted Prof. Mihalache half of the 2009 Galileo Galilei Award "for his achievements in the field of theoretical nonlinear optics". The other half of the Galileo Galilei Award was granted to Prof. Marat S. Soskin from the National Academy of Sciences of Ukraine.

In October 2012, Prof. Dumitru Mihalache was elected Fellow of The Optical Society (OSA), Washington, USA, "For significant theoretical contributions to nonlinear wave phenomena at single and multiple interfaces including surface solitons and spatiotemporal optical solitons", see 2013 Fellows.

Prof. Dumitru Mihalache is one of the Topical Editors of Proceedings of the Romanian Academy, Series A, an open-access Web of Science archival journal, which is edited and published by the Romanian Academy.

He is a Member of the Editorial Board of Romanian Reports in Physics, an open-access Web of Science archival journal, which is edited and published by the Romanian Academy jointly with the Horia Hulubei National Institute of Physics and Nuclear Engineering.

Prof. Dumitru Mihalache is also involved in both the editorial and the referee work for Romanian Journal of Physics, an open-access Web of Science archival journal, which is edited and published by the Romanian Academy jointly with the Horia Hulubei National Institute of Physics and Nuclear Engineering.

Selected publications

An overview paper "Bose-Einstein condensation: Twenty years after" was published in collaboration with V. S. Bagnato, D. J. Frantzeskakis, P. G. Kevrekidis, and B. A. Malomed in a Special Issue of Romanian Reports in Physics dedicated to the twentieth anniversary of the realization of the atomic Bose-Einstein condensation:

Rom. Rep. Phys. 67, 5-50 (2015).

A review paper on ultrashort (few-cycle) solitons in nonlinear optical media and related theoretical and experimental aspects of few-cycle pulses was published in collaboration with Prof. H. Leblond, Univ. Angers, France: H. Leblond and D. Mihalache, "Models of few optical cycle solitons beyond the slowly varying envelope approximation", Phys. Reports 523, 61-126 (2013).

In the course of the past decade, a new level of understanding has been achieved about conditions for the existence, stability and excitation of solitary waves in both conservative (Hamiltonian) and dissipative nonlinear optical media. Novel results in the area of spatiotemporal optical solitons (light bullets) have been obtained in both phenomenological models and those obtained from the first principles (first of all, the one based on quadratic optical nonlinearities). Prof. Dumitru Mihalache has published in J. Opt. B an overview of spatiotemporal optical solitons in collaboration with Prof. B. A. Malomed, Tel-Aviv University, Prof. F. Wise, Cornell University, and Prof. L. Torner, ICFO-Institute de Ciencies Fotoniques, Barcelona.

B. A. Malomed, D. Mihalache, F. Wise, and L. Torner, J. Opt. B Quantum Semiclassical Opt. 7, R53-R72 (2005).

For an overview of recent theoretical and experimental results in the area of spatiotemporal optical solitons, see:

D. Mihalache, Rom. J. Phys. 57, 352-371 (2012).

In collaboration with Prof. H. Leblond, Angers University, France, an adequate description of few-cycle optical solitons beyond the slowly varying envelope approximation was given; see a recent overview [H. Leblond and D. Mihalache, Rom. Rep. Phys. 63, 1254-1266 (2011)].

H. Leblond and D. Mihalache, Rom. Rep. Phys. 63, 1254-1266 (2011).

H. Leblond and D. Mihalache, Phys. Rev. A 79, 063835 (2009).

H. Leblond, D. Kremer, and D. Mihalache, Phys. Rev. A 80, 053812 (2009).

H. Leblond, D. Kremer, and D. Mihalache, Phys. Rev. A 81, 033824 (2010).

H. Leblond and D. Mihalache, Phys. Rev. A 81, 063815 (2010).

By using a powerful reductive perturbation technique a generalized modified Korteweg-de Vries nonlinear partial differential equation was derived, which describes the physics of few-optical-cycle dissipative solitons beyond the slowly varying envelope approximation; see, H. Leblond and D. Mihalache, J. Phys. A: Math. Theor. 43, 375205 (2010).

H. Leblond and D. Mihalache, J. Phys. A: Math. Theor. 43, 375205 (2010).

In collaboration with Prof. Yingji He from Guangdong Polytechnic Normal University, School of Electronics and Information, Guangzhou, China, an overview of recent theoretical results in the area of spatial solitons in parity-time-symmetric linear-nonlinear optical lattices was published; see, Yingji He and Dumitru Mihalache, Rom. Rep. Phys. 64, 1243 (2012).

Yingji He and Dumitru Mihalache, Rom. Rep. Phys. 64, 1243 (2012).

In collaboration with Prof. Fangwei Ye (Hong Kong Baptist University, Hong Kong, China), Prof. Bambi Hu (Hong Kong Baptist University, Hong Kong, China, and University of Houston, USA) and Prof. Nicolae C. Panoiu (University College, London, UK) subwavelength plasmonic lattice solitons in 1D and 2D arrays of metallic nanowires embedded in nonlinear optical media were introduced.

F. Ye, D. Mihalache, B. Hu, and N.C. Panoiu, Phys. Rev. Lett. 104, 106802 (2010).

The existence of robust families of vortex dipoles in nonrotating Bose-Einstein condensates was theoretically predicted, see, L.-C. Crasovan, V. Vekslerchik, V. M. Perez-Garcia, J. P. Torres, D. Mihalache, and L. Torner, Phys. Rev. A 68, 063609 (2003); recently, experimental observation of vortex dipoles in an oblate Bose-Einstein condensate (a few millions of rubidium 87 atoms) was reported, see T. W. Neely, E. C. Samson, A. S. Bradley, M. J. Davis, and B. P. Anderson, Phys. Rev. Lett. 104, 160401 (2010). The vortex dipole observed in this recent experiment coincides with a meta-stable state of superfluid flow with potentially long lifetimes as described in the above mentioned theoretical paper published in 2003 in Physical Review A. In addition, the real-time dynamics of vortex dipoles in trapped dilute-gas Bose-Einstein condensates was recently observed in both asymmetric and symmetric configurations, see D. V. Freilich, D. M. Bianchi, A. M. Kaufman, T. K. Langin, and D. S. Hall, Science 329, 1182-1185 (2010).

L.-C. Crasovan, V. Vekslerchik, V. M. Perez-Garcia, J. P. Torres, D. Mihalache, and L. Torner, Phys. Rev. A 68, 063609 (2003).

In the framework of the complex cubic-quintic Ginzburg-Landau equation, the existence of stable two-dimensional vortex solitons (localized vortices), which would be able to carry an orbital angular momentum was theoretically predicted, see, L.-C. Crasovan, B. A. Malomed, and D. Mihalache, Phys. Rev. E 63, 016605 (2001) and L.-C. Crasovan, B. A. Malomed, and D. Mihalache, Phys. Lett. A 289, 59-65 (2001); recently, experimental observation of such localized vortices in semiconductor lasers was reported, see P. Genevet, S. Barland, M. Giudici, and J. R. Tredicce, Phys. Rev. Lett. 104, 223902 (2010). Such spatial structures, predicted in dissipative optical systems with competing nonlinearities such as a laser with saturable absorber, have received the name of localized vortices (vortex solitons) since they would carry vorticity, but also be bistable and mutually independent, i.e., they would be able to exist in arbitrary number across the system, depending only on initial conditions, as described in the above mentioned experimental paper published in 2010 in Physical Review Letters. Such two-dimensional localized vortex states would enable the realization of arrays of independent and controllable vortex beams, which are useful for advanced optical nanoscopy techniques, microfluidics, or parallel topological optical information encoding, especially if found in fast and compact sources such as semiconductor lasers, see P. Genevet et al., Phys. Rev. Lett. 104, 223902 (2010).

L.-C. Crasovan, B. A. Malomed, and D. Mihalache, Phys. Rev. E 63, 016605 (2001).

L.-C. Crasovan, B. A. Malomed, and D. Mihalache, Phys. Lett. A 289, 59-65 (2001).

Unique swallowtail bifurcation patterns were found in (a) the study of 3D spatiotemporal optical solitons (alias "light bullets") supported by 2D photonic lattices, see, D. Mihalache et al., Phys. Rev. E 70, 055603 (2004), (b) the study of spatiotemporal optical solitons suported by cylindrical Bessel lattices, see, D. Mihalache et al., Phys. Rev. Lett. 95, 023902 (2005), (c) the study of 3D solitons in attractive Bose-Einstein condensates loaded in 3D optical lattices, see, D. Mihalache et al., Phys. Rev. A 72, 021601 (2005), and (d) the study of light bullets in optical media with competing quadratic and self-focusing cubic nonlinearities, see, D. Mihalache et al., Phys. Rev. E 74, 047601 (2006).

D. Mihalache et al., Phys. Rev. E 70, 055603 (2004).

D. Mihalache et al., Phys. Rev. Lett. 95, 023902 (2005).

D. Mihalache et al., Phys. Rev. A 72, 021601 (2005).

D. Mihalache et al., Phys. Rev. E 74, 047601 (2006).

In a paper in Physical Review Letters, Stefano Minardi and co-workers at Friedrich Schiller University in Jena, Germany, and at Institute of Photonic Sciences in Barcelona, Spain, reported for the first time the generation of three-dimensional spatiotemporal optical solitons (alias light bullets) in a hexagonal array of glass waveguides, see S. Minardi et al., Phys. Rev. Lett. 105, 263901 (2010) and a Viewpoint in Physics 3, 107 (2010) by Frank W. Wise, Cornell University, USA. These light bullets have a limited existence range, evolve following varying dispersion or diffraction conditions until they leave their existence range and decay; also there is a finite energy threshold for the existence of three-dimensional discrete-continuous spatiotemporal optical solitons, see the earlier theoretical study on the existence and stability domains of these unique localized packets of electromagnetic energy: D. Mihalache et al., Phys. Rev. E 70, 055603 (2004).

We studied varieties of stable localized vortices in Ginzburg-Landau media with radially inhomogeneous losses. The balance of transverse diffraction, self-focusing, gain, and the inhomogeneous loss provides for the hitherto elusive stabilization of vortex solitons in a large area of the parameter space. Stability domains were found for several novel kinds of vortex solitons, including spinning elliptically shaped ones, eccentric elliptic vortices, which feature double rotation, spinning crescents, and breathing vortices, see V. Skarka, N. B. Aleksic, H. Leblond, B. A. Malomed, and D. Mihalache, Phys. Rev. Lett. 105, 213901 (2010).

V. Skarka, N. B. Aleksic, H. Leblond, B. A. Malomed, and D. Mihalache, Phys. Rev. Lett. 105, 213901 (2010).

Main results

Main research directions

 
 

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