Now showing items 1-20 of 22

    • Asymmetric light propagation in chirped photonic crystal waveguides 

      Kurt H.; Yilmaz, D.; Akosman, A.E.; Özbay, Ekmel (Optical Society of American (OSA), 2012)
      We report numerical and experimental investigations of asymmetric light propagation in a newly designed photonic structure that is formed by creating a chirped photonic crystal (PC) waveguide. The use of a non-symmetric ...
    • Broadband one way propagation via dielectric waveguides with unequal effective index 

      Öner, B. B.; Üstün, K.; Kurt, H.; Okyay, Ali Kemal; Turhan-Sayan, G. (IEEE, 2014)
      We present an efficient approach for broad band one way propagation of light by parallel and unequal dielectric waveguides leading different effective phase shifts. Three dimensional numerical simulations show that 30% ...
    • Compact wavelength de-multiplexer design using slow light regime of photonic crystal waveguides 

      Akosman, A.E.; Mutlu, M.; Kurt H.; Özbay, Ekmel (Optical Society of American (OSA), 2011)
      We demonstrate the operation of a compact wavelength demultiplexer using cascaded single-mode photonic crystal waveguides utilizing the slow light regime. By altering the dielectric filling factors of each waveguide segment, ...
    • Dipole antenna couplers for subwavelength metal-insulator-metal waveguides 

      Onbasli, M.C.; Okyay, Ali K. (Optical Society of America, 2010)
      Near-infrared light (λ=1550 nm) was coupled into a 100-nm-core Ag/SiO2/Ag waveguide using dipole antennas. We demonstrate that using antennas, the field intensity inside the waveguide can be enhanced by changing the antenna ...
    • Directivity enhancement and deflection of the beam emitted from a photonic crystal waveguide via defect coupling 

      Guven, K.; Özbay, Ekmel (Optical Society of American (OSA), 2007)
      We experimentally and numerically investigate the spatial distribution of the emission from a photonic crystal waveguide, coupled with defects, that are located at the output edge. Two defects that are located symmetrically ...
    • Dual-frequency division de-multiplexer based on cascaded photonic crystal waveguides 

      Akosman, Ahmet E.; Mutlu, Mehmet; Kurt, H.; Özbay, Ekmel (Elsevier, 2012-02-28)
      A dual-frequency division de-multiplexing mechanism is demonstrated using cascaded photonic crystal waveguides with unequal waveguide widths. The de-multiplexing mechanism is based on the frequency shift of the waveguide ...
    • Electrically-reconfigurable integrated photonic switches 

      Fidaner, O.; Demir, Hilmi Volkan; Sabnis V.A.; Harris Jr. J.S.; Miller, D.A.B.; Zheng J.-F. (IEEE, 2004)
      We report remotely electrically reconfigurable photonic switches that intimately integrate waveguide electroabsorption modulators with surface-normal photodiodes, avoiding conventional electronics. These switches exhibit ...
    • Electro-optic modulation of InAs quantum dot waveguides 

      Akça, İmran. B.; Dâna, Aykutlu; Aydınlı, Atilla; Rossetti, M.; Li, L.; Fiore, A.; Dağlı, N. (Technische Universiteit Eindhoven, 2008)
      The linear electro-optic properties in waveguides containing self-organized In As quantum dots were studied experimentally. Fabry-Perot measurements at 1515 nm on InAs/GaAs quantum dot structures yield a significantly ...
    • Femtosecond laser written waveguides deep inside silicon 

      Pavlov, I.; Tokel, O.; Pavlova, S.; Kadan, V.; Makey, G.; Turnalı, A.; Yavuz, Ö.; Ilday, F. Ö. (Optical Society of America, 2017)
      Photonic devices that can guide, transfer, or modulate light are highly desired in electronics and integrated silicon (Si) photonics. Here, we demonstrate for the first time, to the best of our knowledge, the creation of ...
    • Investigation of localized coupled-cavity modes in two-dimensional photonic bandgap structures 

      Özbay, Ekmel; Bayindir, M.; Bulu, I.; Cubukcu, E. (IEEE, 2002)
      We present a detailed study of the localized coupled-cavity modes in 2-D dielectric photonic crystals. The transmission, phase, and delay time characteristics of the various coupled-cavity structures are measured and ...
    • Large bandwidth mode order converter by differential waveguides 

      Oner, B.B.; Üstün, K.; Kurt H.; Okyay, A., K.; Turhan-Sayan G. (Optical Society of American (OSA), 2015)
      In this article, we propose a large bandwidth mode-order converter design by dielectric waveguides with equal lengths but different cross-sectional areas. The efficient conversion between even and odd modes is verified by ...
    • Modulation in InAs quantum dot waveguides 

      Akca, B. Imran; Dana, Aykutlu; Aydınlı, Atilla; Rossetti, M.; Li L.; Fiore, A.; Dagli, N. (Optical Society of America, 2007)
      Modulation in molecular beam epitaxy grown self-assembled InAs quantum dot waveguides have been studied at 1500 nm as a function of wavelength and voltage. Enhanced electro-optic coefficients compared to bulk GaAs were ...
    • Modulation of multilayer InAs quantum dot waveguides under applied electric field 

      Akça, Imran B.; Dana, Aykutlu; Aydınlı, Atilla; Rossetti, M.; Li L.; Fiore, A.; Dagli, N. (Optical Society of America, 2007)
      Electric field dependence of optical modulation in self assembled InAs quantum dot waveguides have been studied at 1300 and 1500 nm. Electro-absorption and electro-optic coefficients of these waveguides have been obtained ...
    • Nanoantenna couplers for metal-insulator-metal waveguide interconnects 

      Onbasli, M.C.; Okyay, A., K. (SPIE, 2010)
      State-of-the-art copper interconnects suffer from increasing spatial power dissipation due to chip downscaling and RC delays reducing operation bandwidth. Wide bandwidth, minimized Ohmic loss, deep sub-wavelength confinement ...
    • Novel SIW based interdigital bandpass filter with harmonic suppression 

      Kurudere, S.; Ertürk, Vakur B. (IEEE, 2014)
      A novel configuration for substrate integrated waveguide (SIW) based bandpass filter with interdigital type resonators is presented. In the proposed structure, interdigital type resonators consisting of vias and circular ...
    • Physics and applications of photonic nanocrystals 

      Ozbay E.; Guven K.; Aydin K.; Bayindir M. (2004)
      Photonic nanocrystals are periodic dielectric or metallic structures having photonic bands in analogy to electronic bands of semiconductors. The presence of photonic band-gaps, where the propagation of photons of certain ...
    • Three dimensional microfabricated broadband patch and multifunction reconfigurable antennae for 60 GHz applications 

      Hünerli H. V.; Mopidevi, H.; Cağatay, E.; Imbert, M.; Romeu, J.; Jofre, L.; Çetiner, B. A.; Bıyıklı, Necmi (IEEE, 2015-04)
      In this paper we present two antenna designs capable of covering the IEEE 802.11ad (WiGig) frequency band (57-66 GHz and 59-66 GHz respectively). The work below reports the design, microfabrication and characterization of ...
    • Tunable ring-coupled Mach-Zehnder interferometer based on lithium niobate 

      Solmaz, M. E. (Taylor and Francis, 2014)
      The fabrication and characterization are reported of a Fano resonance-based electro-optically tunable ring resonator-coupled Mach-Zehnder interferometer device based on a chalcogenide-lithium niobate hybrid waveguide system. ...
    • Ultra hybrid plasmonics: Strong coupling of plexcitons with plasmon polaritons 

      Balci, S.; Kocabas, C. (OSA - The Optical Society, 2015)
      We report a ternary-coupled plasmonic system consisting of excitons of J-aggregated dye, localized surface plasmon polaritons of Ag nanoparticles, and propagating surface plasmon polaritons of continuous Ag film. J-aggregate ...
    • Ultrahigh contrast one-way optical transmission through a subwavelength slit 

      Battal, E.; Yogurt, T. A.; Okyay, A., K. (Springer, 2013)
      We computationally demonstrate one-way optical transmission characteristics of a subwavelength slit. We comparatively study the effect in single layer and double layer metallic corrugations. We also investigate the effect ...