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Articles

 

Recent Submissions

  • Valagiannopoulos, Constantinos (Metamaterials, 2018)
    Structural boundaries, materials and feeding sources are the three fundamental segments defining photonic devices. Since excitation is usually dictated by the application and there are infinite ways to select the spatial ...
  • Tsitsas, N. L.; Valagiannopoulos, Constantinos (Metamaterials, 2018)
    The optimal parameters of a dielectric metasurface, composed of two alternating rectangular rods, are investigated so that it exhibits significant enhancement in the −1- diffracted order in the transmission region. An ...
  • Gangaraj, S Ali Hassani; Monticone, Francesco; Valagiannopoulos, Constantinos (Nanomaterials and Nanotechnology, 2018-09)
    Anomalous scattering effects (invisibility, superscattering, Fano resonances, etc) enabled by complex media and metamaterials have been the subject of intense efforts in the past couple of decades. In this article, we ...
  • Nefedov, I. S.; Shalin, A. S.; Valagiannopoulos, Constantinos (Journal of Physics, 2018)
    We show and investigate the optical forces acting on a particle in the vicinity of a planar waveguide which is lled with hyperbolic material and supports propagation across its plane (two-dimensional). The anisotropy ...
  • Tagay, Zhenisbek; Valagiannopoulos, Constantinos (Physical review B, 2018-09-25)
    Gratings of infinite wires make, perhaps, the simplest class of metasurfaces, which, however, are utilized for a variety of different objectives in wave manipulation. Importantly, due to their analytical solvability, ...
  • Akilbekova, Dana; Ogay, Vyacheslav; Yakupov, Talgat; Sarsenova, Madina; Umbayev, Bauyrzhan; Nurakhmetov, Asset; Tazhin, Kairat; Yakovlev, Vladislav V.; Utegulov, Zhandos N. (Journal of Biomedical Optics, 2018-09-27)
    Biomechanical properties of mammalian bones, such as strength, toughness, and plasticity, are essential for understanding how microscopic-scale mechanical features can link to macroscale bones’ strength and fracture ...
  • Rakhymzhanov, A. M.; Gueddida, A.; Alonso-Redondo, E.; Utegulov, Zhandos; Perevoznik, D.; Kurselis, K.; Chichkov, B. N.; El Boudouti, E. H.; Djafari-Rouhani, B.; Fytas, G. (Applied Physics Letters, 2016-05)
    The phononic band diagram of a periodic square structure fabricated by femtosecond laser pulseinduced two photon polymerization is recorded by Brillouin light scattering (BLS) at hypersonic (GHz) frequencies and computed ...
  • Coker, Zachary; Troyanova‐Wood, Maria; Traverso, Andrew J.; Yakupov, Talgat; Utegulov, Zhandos; Yakovlev, Vladislav V. (Optics Express, 2018-02)
    Brillouin spectroscopy and imaging has experienced a renaissance in recent years seeing vast improvements in methodology and increasing number of applications. With this resurgence has come the development of new spontaneous ...
  • Poborchii, Vladimir; Morita, Yukinori; Tada, Tetsuya; Geshev, Pavel I.; Utegulov, Zhandos; Volkov, Alexey (Journal of Applied Physics, 2016-04)
    We have fabricated Si-on-insulator (SOI) layers with a thickness h1 of a few nanometers and examined them by Raman spectroscopy with 363.8 nm excitation. We have found that phonon and electron confinement play important ...
  • Every, A. G.; Utegulov, Zhandos; Veres, I. A. (Journal of Applied Physics, 2013-11)
    An approach is presented for calculating thermoelastic generation of ultrasound in a metal plate exposed to nanosecond pulsed laser heating, sufficient to cause melting but not ablation. Detailed consideration is given to ...
  • Boardman, A.D.; Grimalsky, V.V.; Guo, T.; Kibler, B.; McNiff, J.; Nefedov, I.; Rapoport, Y.; Argyropoulos, C.; Valagiannopoulos, Constantinos (Nazarbayev University School of Science and Technology, 2018-05-07)
    The investigation of hyperbolic metamaterials, shows that metal layers that are part of graphene structures, and also types I and II layered systems, are readily controlled. Since graphene is a nicely conducting sheet it ...
  • Valagiannopoulos, Constantinos; Tsitsas, Nikolaos L.; Sihvola, Ari H. (Nazarbayev University School of Science and Technology, 2016-08-18)
    A ground-penetrating radar (GPR) antenna excites a perfectly electric conducting inclusion buried inside the ground. The scattering problem is solved semi-analytically via integral equation techniques. The permittivity and ...
  • Valagiannopoulos, Constantinos; Lagoudakis, Pavlos G. (Nazarbayev University School of Science and Technology, 2018-04-13)
    Based on effective-medium approximation, we analytically optimize the color conversion of GaN-based light-emitting p–n junctions, with respect to the size and spatial density of the used photonic crystals (PhCs), being ...
  • Hennig, D.; Mulhern, C.; Schimansky-Geier, L.; Tsironis, G.P.; Hänggi, P. (Physics Reports, 2015-07-20)
    Abstract The physics of activated escape of objects out of a metastable state plays a key role in diverse scientific areas involving chemical kinetics, diffusion and dislocation motion in solids, nucleation, electrical ...
  • Oikonomou, Th.; Nergis, A.; Lazarides, N.; Tsironis, G.P. (Chaos, Solitons & Fractals, 2014-12-01)
    Abstract Nonequilibrium, quasi-stationary states of a one-dimensional “hard” ϕ4 deterministic lattice, initially thermalised to a particular temperature, are investigated when brought into contact with a stochastic thermal ...
  • Zaurbekova, Z.; Chikhray, Y.; Ponkratov, Y.; Baklanov, V.; Abdullin, K.; Kulsartov, T.; Gordienko, Y.; Tazhibayeva, I.; Skakov, M.; Mukanova, A. (Materials Today: Proceedings, 2017-01-01)
    Abstract The paper describes a technique of CNT synthesis on the fibers of carboxylic fabric. It consists of three operational stages: creation of the experimental facility based on high-temperature quartz flow reactor; ...
  • Mandilara, Aikaterini; Ivić, Zoran; Čevizović, Dalibor; Pržulj, Željko (Chaos, Solitons & Fractals, 2017-12-01)
    Abstract We show that the self-induced transparency of optical phonons may appear in a systems consisting of a two level atoms interacting with elastic waves. The presence of the gap in phonon spectrum substantially enhances ...
  • Asle Zaeem, M.; El Kadiri, H.; Horstemeyer, M.F.; Khafizov, M.; Utegulov, Z. (Current Applied Physics, 2012-03-01)
    Abstract Phase stability, topology and size evolution of precipitates are important factors in determining the mechanical properties of crystalline materials. In this article, the Cahn–Hilliard type of phase-field model ...
  • Kenzhina, I.; Kulsartov, T.; Chikhray, Y.; Shestakov, V.; Tolebay, A.; Askerbekov, S.; Tazhibayeva, I.; Gordienko, Y.; Ponkratov, Y.; Zaurbekova, Zh.; Mukanova, A. (Materials Today: Proceedings, 2017-01-01)
    Abstract V-Ti-Cr vanadium alloys have many perspective applications, particularly, they are considered as a main structural material of the first wall and blanket of fusion reactor with lithium coolant. Also, they are used ...
  • Canturk, Bilal; Oikonomou, Thomas; Bagci, G. Baris (Annals of Physics, 2017-02-01)
    Abstract Curado et al. (2016) have recently studied the axiomatic structure and the universality of a three-parameter trace-form entropy inspired by the group-theoretical structure. In this work, we study the group-theoretical ...

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