Department of Physics

Quantum optics and solid state spectroscopy

Shumovsky, Alexander S. (Springer, 1997)

Possibility of formation of strongly correlated states of the bosonic excitations in solids similar to the squeezed states of photons is considered. The possibility of observation of these states in optical spectroscopy ...

Quantum multipole radiation

Shumovsky, Alexander S. (John Wiley & Sons, 2001)

The author reviews investigations of the photon localization and quantum phase problems based on the use of the representation of multipole photons. Section II presents a general consideration of the field quantization, ...

Defect luminescence in some layered binary chalcogenide semiconductors

Aydinli, A.; Gasanly, N. M. (Scientific.Net, 2002)

A number of semiconductors such as GaS, GaSe, GaSSe show layered structure where intralayer bonding is strong and interlayer bonding quite weak. With bandgaps mostly in the visible and the near infrared and high crystal ...

Tunable deflection and asymmetric transmission of THz waves using a thin slab of graphene-dielectric metamaterial, with and without ENZ components

Serebryannikov, A. E.; Hajian, H.; Beruete, M.; Ozbay, E.; Vandenbosch, G. A. E. (Optical Society of America, 2018)

Tunable deflection of obliquely incident, linearly polarized terahertz waves is theoretically studied in a wide frequency range around 20 THz, by combining a thin slab of graphene-dielectric metamaterial (with ten layers ...

Density-wave instability and collective modes in a bilayer system of antiparallel dipoles

Akaturk, E.; Abedinpour, S. H.; Tanatar, B. (IOP Publishing, 2018-01)

We consider a bilayer of dipolar particles in which the polarization of dipoles is perpendicular to the planes, in the antiparallel configuration. Using accurate static structure factor S q( ) data from hypernetted-chain ...

Mixed ab initio and semiempirical study of hydrogen-terminated finite germanium nanowires

Niaz, S.; GÜlseren, O.; Khan, M. A.; Ullah, I. (Springer Berlin Heidelberg, 2018)

We present a mixed ab initio and semiempirical method for the cohesive energy and electronic gap calculations of hydrogen passivated tetrahedral and clathrate germanium nanowires (∼ 1850 atoms) with acceptable accuracy, ...

Thermal annealing effects on the electrical and structural properties of Ni/Pt Schottky contacts on the quaternary AlInGaN epilayer

Arslan, E.; Altındal, Ş.; Ural, S.; Kayal, Ö. A.; Öztürk, M.; Özbay, E. (Springer US, 2018)

Pt/Au, Ni/Au, Ni/Pt/Au Schottky contacts were placed on a quaternary Al0.84In0.13Ga0.03N epilayer. The electrical and structural properties of the as-deposited Pt/Au, Ni/Au, Ni/Pt/Au and annealed Ni/Pt/Au Schottky contacts ...

Strategies for plasmonic hot‐electron‐driven photoelectrochemical water splitting

Ghobadi, T. G. U.; Ghobadi, A.; Ozbay, E.; Karadas, F. (Wiley - V C H Verlag GmbH & Co. KGaA, 2018)

Photoelectrochemical water splitting (PEC‐WS) was inspired by the natural photosynthesis process that utilizes sunlight energy to produce chemical energy through splitting water to form hydrogen and oxygen. One recent ...

Stm of glow-discharge treated surfaces

Oral, A.; Serbetci, A. I.; Elliatioglu, R.; Piskin, E. (Taylor & Francis Inc., 1993)

As a model surface, graphite slides were treated by pure nitrogen gas plasma for different periods (15 sec-5 min). These samples were kept in air or under argon atmosphere in sealed holders. STM images were obtained at ...

The infrared and Raman spectra of 4-phenylpyridine and its Hofmann type complexes.

Bayarı, S.; Topaçlı, A.; Aydınlı, A. (Taylor & Francis Inc., 1994)

he Infrared and Raman spectra of 4-Phenylpyridine are reported for the first time in the 4000-400cm−1 range. Vibrational assignments have been made for fundamental modes on the basis of frequency shifts of coordinated ...

Connection of collimation, asymmetric beaming, and independent transmission-reflection processes in concentric-groove gratings supporting spoof surface plasmons

Habib, M.; Serebryannikov, A. E.; Caglayan, H.; Vandenbosch, G. A. E.; Ozbay, E. (Springer New York LLC, 2018)

Transmission through subwavelength apertures enables separation of the incidence half-space and the exit half-space, which leads to that the spatial distribution of the field in the latter is not affected by the distribution ...

Possible plasmonic acceleration of LED modulation for Li-Fi applications

Guzatov, D. V.; Gaponenko, S. V.; Demir, H. V. (Springer New York LLC, 2018)

Emerging LED-based wireless visible light communication (Li-Fi) needs faster LED response to secure desirable modulation rates. Decay rate of an emitter can be enhanced by plasmonics, typically by an expense of efficiency ...

Multilayer graphene broadband terahertz modulators with flexible substrate

Kaya, E.; Kakenov, N.; Altan, H.; Kocabas, C.; Esenturk, O. (Springer New York LLC, 2018)

Fabrication of terahertz modulators as simple devices with high modulation depth across a broad bandwidth is still very challenging. In this study, four different chemical vapor deposition grown multilayer graphene (MLG) ...

Laser writing of nanostructures deep inside Gallium Arsenide (GaAs)

Tokel, O.; Turnali, A.; Deminskyi, P.; Ilday, S.; Ömerllday, F. (OSA - The Optical Society, 2018)

Recently, we have showed a direct laser writing method that enables the first subsurface modifications and functional devices created deep inside silicon. Here, we extend the technique demonstrating the first controlled ...

Discrete similariton regime for energy scaling of modelocked thin-disk lasers

Ilday, F. Ö.; Hoffmann, M.; Saraceno, C. J. (Institute of Electrical and Electronics Engineers, 2018)

We investigate energy scaling of modelocked thin-disk lasers via modelocking regimes which are more tolerant in terms of maximum nonlinearity than soliton modelocking. Our numerical results show promise for mJ-level pulse ...

Applying the principle of orthogonality of high dimensional random vectors to obtain high-density, large-volume 3D holographic display

Makey, G.; Yavuz, O.; Kesim, D. K.; Turnalı, A.; Elahi, P.; Toumi, J.; El-Daher, M. S.; Ilday, S.; Tokel, O.; Ilday, F. Ö. (OSA - The Optical Society, 2018)

The efforts toward truly 3D displays are far from exploiting the full potential of holography. Here, we apply the principle of orthogonality of high dimensional random vectors to obtain unprecedented dense, large volume holograms.