Now showing items 1-20 of 21

    • Carrier-induced refractive index change in InN 

      Bulutay, C.; Zakhleniuk, N. A. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2008)
      Rapid development of InN technology demands comprehensive assessment of the electronic and optoelectronic potential of this material. In this theoretical work the effect of free electrons on the optical properties of the ...
    • Circular holographic video display system 

      Yaraş, F.; Kang, H.; Onural, L. (Optical Society of American (OSA), 2011)
      A circular holographic video display system reconstructs holographic video. Phase-only spatial light modulators are tiled in a circular configuration in order to increase the field of view. A beam-splitter is used to align ...
    • Circularly configured multi-SLM holographic display system 

      Yaraş, F.; Kang, H.; Onural, L. (IEEE, 2011)
      The designed circular holographic display system produces ghost-like 3D optical reconstructions of a computer generated 3D model. System uses six phase-only reflective-type spatial light modulators (SLMs) that are configured ...
    • Color holographic reconstruction using multiple SLMs and LED illumination 

      Yaraş, F.; Onural, L. (S P I E - International Society for Optical Engineering, 2009)
      A color holographic reconstruction technique by using three light emitting diodes (LEDs) is described. Reflective type phase-only spatial light modulators (SLMs) are used since they are suitable for in-line phase holograms. ...
    • Current research activities on holographic video displays 

      Onural, L.; Yaraş, F.; Kang, H. (S P I E - International Society for Optical Engineering, 2010)
      "True 3D" display technologies target replication of physical volume light distributions. Holography is a promising true 3D technique. Widespread utilization of holographic 3D video displays is hindered by current technological ...
    • Design of a 360-degree holographic 3D video display using commonly available display panels and a paraboloid mirror 

      Onural, L. (SPIE, 2017)
      Even barely acceptable quality holographic 3D video displays require hundreds of mega pixels with a pixel size in the order of a fraction of a micrometer, when conventional flat panel SLM arrangement is used. Smaller pixel ...
    • Electrically controlled terahertz spatial light modulators with graphene arrays 

      Kakenov, N.; Takan, T.; Ozkan, V. A.; Balci, O.; Polat, E. O.; Altan, H.; Kocabas, C. (Institute of Electrical and Electronics Engineers Inc., 2016)
      Gate-tunable high-mobility electrons on atomically thin graphene layers provide a unique opportunity to control electromagnetic waves in a very broad spectrum. In this paper, we describe an electrically-controlled multipixel ...
    • Graphene-based optical modulators 

      Balci S.; Kocabas, C. (World Scientific Publishing Co. Pte. Ltd., 2017)
      In this chapter, we summarize the recent progress on graphene based optical modulators. Ability to control density of high mobility electrons on large area graphene surface enables realization of new type of electrooptical ...
    • A hole modulator for InGaN/GaN light-emitting diodes 

      Zhang, Z-H.; Kyaw, Z.; Liu W.; Ji Y.; Wang, L.; Tan S.T.; Sun, X. W.; Demir, H. V. (American Institute of Physics, 2015)
      The low p-type doping efficiency of the p-GaN layer has severely limited the performance of InGaN/GaN light-emitting diodes (LEDs) due to the ineffective hole injection into the InGaN/GaN multiple quantum well (MQW) active ...
    • Infrared digital holography applications for virtual museums and diagnostics of cultural heritage 

      Paturzo, M.; Pelagotti, A.; Geltrude, A.; Locatelli, M.; Poggi P.; Meucci, R.; Ferraro P.; Stoykova, E.; Yaraş F.; Özgür Yontem, A.; Kang H.; Onural L. (2011)
      Infrared digital holograms of different statuettes are acquired. For each object, a sequence of holograms is recorded rotating the statuette with an angular step of few degrees. The holograms of the moving objects are used ...
    • Integral imaging using phase-only LCoS spatial light modulators as Fresnel lenslet arrays 

      Ÿontem, A. O.; Onural, L. (Optical Society of Amercia, 2011-10-27)
      We present a digital integral imaging system. A Fresnel lenslet array pattern is written on a phase-only LCoS spatial light modulator device (SLM) to replace the regular analog lenslet array in a conventional integral ...
    • Lyotropic liquid-crystalline mesophase of lithium triflate-nonionic surfactant as gel electrolyte for graphene optical modulator 

      Balci, F. M.; Balci, S.; Kocabas, C.; Dag, Ö. (American Chemical Society, 2017)
      Lithium salt (noncoordinating anions, such as lithium triflate (Ltf)) gel electrolytes may be key for the practical use of electrochemical devices. We introduce a new lyotropic liquid-crystalline (LLC) mesophase using Ltf, ...
    • Method to enlarge the hologram viewing window using a mirror module 

      Kang H.; Ohmura, N.; Yamaguchi, T.; Yoshikawa H.; Kim, S.-C.; Kim, E.-S. (2009)
      A liquid crystal panel for a video projector is often used for holographic television. However, its pixel size and pixel number are not enough for practical holographic 3-D display. Therefore, a multipanel configuration ...
    • Multi-SLM holographic display system with planar configuration 

      Yaraş, F.; Kang, H.; Onural, L. (IEEE, 2010)
      Holographic display system that uses six phase-only spatial light modulators (SLMs) performs holographic reconstructions from the phase-hologram of a point cloud that is extracted from 3D object. The SLMs are tiled as a ...
    • An overview of research in 3DTV 

      Onural, L. (2007)
      3DTV is regarded by the experts and the general public as the next major step in video technologies. The ghost-like images of remote persons or objects are already depicted in many futuristic movies; both entertainment ...
    • Real-time color holographic video display system 

      Yaraş, F.; Kang, H.; Onural, L. (IEEE, 2009)
      A real-time multi-GPU color holographic video display system computes holograms from 3D video of a rigid object. System has three main stages; client, server and optics. 3D coordinate and texture information are kept in ...
    • Reconstruction of computer generated holograms by spatial light modulators 

      Kovachev, M.; Ilieva, R.; Onural L.; Esmer G.B.; Reyhan, T.; Benzie P.; Watson J.; Mitev, E. (Springer Verlag, 2006)
      Computer generated holograms generated by using three different numerical techniques are reconstructed optically by spatial light modulators. Liquid crystal spatial light modulators (SLM) on transmission and on reflection ...
    • Signal processing for three-dimensional holographic television displays that use binary spatial light modulators 

      Ulusoy, E.; Onural L.; Ozaktas, H., M. (2010)
      One of the important techniques used for three dimensional television (3DTV) is holography. In holographic 3DTV, spatial light modulators (SLM) are used as the display device. SLMs that provide the most limited modulation ...
    • Synthesis of three-dimensional light fields with binary spatial light modulators 

      Ulusoy, E.; Onural, L.; Ozaktas, H. M. (Optical Society America, 2011-05-24)
      Computation of a binary spatial light modulator (SLM) pattern that generates a desired light field is a challenging quantization problem for which several algorithms have been proposed, mainly for far-field or Fourier plane ...
    • Tunable visible response of ZnO thin-film phototransistors with atomic layer deposition technique 

      Aygun L.E.; Bozkurt-Oruc F.; Okyay, A., K. (2012)
      We fabricated TFPT with 14-nm-thick n-ZnO channel at 80°C by ALD technique. The drain to source photocurrent due to UV photons can be tuned by changing gate voltage. We also observed that the absorption of sub-bandgap ...