Now showing items 1-16 of 16

    • 1.06μm-1.35μm coherent pulse generation by a synchronously-pumped phosphosilicate Raman fiber laser 

      Elahi, Parviz; Makey, Ghaith; Turnalı, Ahmet; Tokel, Onur; İlday, Fatih Ömer (OSA, 2017)
      Summary form only given. Rare-earth-doped fiber lasers are attractive for microscopy and imaging applications and have developed over the past decades rapidly. They are unable to cover near-infra-red region entirely and ...
    • Applying the principle of orthogonality of high dimensional random vectors to obtain high-density, large-volume 3D holographic display 

      Makey, Ghaith; Yavuz, Özgün; Kesim, Denizhan Koray; Turnalı, Ahmet; Elahi, Parviz; Toumi, J.; El-Daher, M. S.; Ilday, Serim; Tokel, Onur; İlday, F. Ömer (OSA, 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.
    • Breaking crosstalk limits to dynamic holography using orthogonality of high-dimensional random vectors 

      Makey, Ghaith; Yavuz, Özgün; Kesim, Denizhan K.; Turnalı, Ahmet; Elahi, Parviz; İlday, Serim; Tokel, Onur; İlday, F. Ömer (Nature Publishing Group, 2019)
      Holography is the most promising route to true-to-life three-dimensional (3D) projections, but the incorporation of complex images with full depth control remains elusive. Digitally synthesized holograms1,2,3,4,5,6,7, which ...
    • Buried waveguides written deep inside silicon 

      Turnalı, Ahmet; Tokel, Onur; Kesim, Denizhan Koray; Makey, Ghaith; Elahi, Parviz; İlday, Fatih Ömer (OSA, 2017)
      Summary form only given. Silicon waveguides are widely used as optical interconnects and they are particularly important for Si-photonics. Si-based devices, along with other optical elements, are entirely fabricated on the ...
    • Computer-generated holograms embedded in bulk silicon with nonlinear laser lithography 

      Turnalı, Ahmet; Tokel, Onur; Makey, Ghaith; Pavlov, Ihor; İlday, Fatih Ömer (IEEE, 2016)
      Recently, we have showed a direct laser writing method to form subsurface structures inside silicon by exploiting nonlinear interactions. Here, we demonstrate utilization of this phenomenon to create computer-generated ...
    • Direct laser writing of volume fresnel zone plates in silicon 

      Turnalı, Ahmet; Tokel, Onur; Pavlov, Ihor; İlday, F. Ömer (IEEE, 2015)
      Functional optical elements fabricated on silicon (Si) constitute fundamental building blocks of Si photonics [1]. For the fabrication of these elements, conventional lithography and etching techniques are used. In spite ...
    • Holograms deep inside Silicon 

      Makey, Ghaith; Tokel, Onur; Turnalı, Ahmet; Pavlov, Ihor; Elahi, Parviz; Yavuz, Ozg ¨ un; İlday, F. Ömer (Optical Society of America, 2016)
      Through the Nonlinear Laser Lithography method, we demonstrate the first computer generated holograms fabricated deep inside Silicon. Fourier and Fresnel holograms are fabricated buried inside Si wafers, and a generation ...
    • In-chip devices fabricated with nonlinear laser lithography deep inside silicon 

      Turnalı, Ahmet (Bilkent University, 2019-05)
      The integration of photonic elements with electronic elements on the same chip is highly desirable, since it may lead to new generation of devices. One constraint in this direction is the limited space available on the ...
    • Laser writing deep inside silicon for 3D information Processing 

      Tokel, Onur; Turnalı, Ahmet; Pavlov, Ihor; İlday, F. Ömer (IEEE, 2015)
      Micromachining of silicon (Si) with lasers is being investigated since the 1970s [1]. So far, generation of controlled subsurface modification in the bulk of Si with high precision has not been achieved. This is highly ...
    • Laser writing of nanostructures deep inside Gallium Arsenide (GaAs) 

      Tokel, Onur; Turnalı, Ahmet; Deminskyi, Petro; İlday, Serim; İlday, F. Ömer (OSA, 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 ...
    • Laser-slicing of silicon with 3D nonlinear laser lithography 

      Tokel, Onur; Turnalı, Ahmet; Çolakoğlu, T.; İlday, Serim; Borra, M. Z.; Pavlov, Ihor; Bek, A.; Turan, R.; İlday, Fatih Ömer (OSA, 2017)
      Recently, we have showed a direct laser writing method that exploits nonlinear interactions to form subsurface modifications in silicon. Here, we use the technique to demonstrate laser-slicing of silicon and its applications.
    • Laser-written depressed-cladding waveguides deep inside bulk silicon 

      Turnalı, Ahmet; Han, Mertcan; Tokel, Onur (OSA - The Optical Society, 2019-03)
      Laser-written waveguides created inside transparent materials are important components for integrated optics. Here, we demonstrate that subsurface modifications induced by nanosecond pulses can be used to fabricate ...
    • Optical waveguides written deep inside silicon by femtosecond laser 

      Pavlov, Ihor; Tokel, Onur; Pavlova, S.; Kadan, V.; Makey, Ghaith; Turnalı, Ahmet; Çolakoğlu, T.; Yavuz, O.; İlday, Fatih Ömer (OSA, 2017)
      Summary form only given. Photonic devices that can guide, transfer or modulate light are highly desired in electronics and integrated silicon photonics. Through the nonlinear processes taking place during ultrafast ...
    • Physical model for subsurface silicon writing 

      Tokel, Onur; Turnalı, Ahmet; Pavlov, Ihor; İlday, Fatih Ömer (IEEE, 2016)
      We have recently reported a direct laser writing method enabling buried structures deep inside silicon. Here we study the formation of these subsurface structures. We take advantage of Nonlinearity Engineering to understand ...
    • Slicing crystalline silicon wafer by deep subsurface laser processing and selective chemical etching 

      Borra, M. Z.; Nasser, H.; Çiftpınar, E. H.; Turnalı, Ahmet; Deminskyi, Petro; Çolakoğlu, T.; Tokel, Onur; İlday, Fatih Ömer; Pavlov, I.; Turan, R.; Bek, A. (Institute of Electrical and Electronics Engineers Inc., 2019)
      In this work, we demonstrate use of laser-induced silicon slicing (LASIS) technique to fabricate crystalline silicon (c-Si) slices [1]. In LASIS method, a nanosecond-pulsed fiber laser operating at 1.55 μm wavelength, ...
    • Three dimensional processing of silicon with pulsed lasers for optical applications 

      Turnalı, Ahmet (Bilkent University, 2015-05)
      Micromachining of silicon with lasers is being investigated for the last three decades. Until now, interior silicon modification without inscribing the surface has not resulted in success. Such an ability could enable ...