WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7150

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Now showing 1 - 6 of 6
  • Article
    Citation - WoS: 5
    Citation - Scopus: 5
    Large Rabi Splitting of Mixed Plasmon-Exciton States in Small Plasmonic Moire Cavities
    (The Optical Society, 2020) Ateş, Simge; Karademir, Ertuğrul; Balcı, Sinan; Kocabaş, Coşkun; Aydınlı, Atilla; Ateş, Simge; Ateş, Simge; Karademir, Ertuğrul; Karademir, Ertuğrul; Balcı, Sinan; Balcı, Sinan; Kocabaş, Coşkun; Kocabaş, Coşkun; Aydınlı, Atilla; Aydınlı, Atilla
    We report on exciton-plasmon coupling in metallic moire cavities, both numerically and experimentally. Moire cavities fabricated using double exposure laser interference lithography were filled with a molecular dye, J-aggregate. Polarization-dependent spectroscopic reflection measurements supported by simulations reveal strong coupling of organic dye excitons with cavity modes of the plasmonic moire cavities. An anti-crossing at zero detuning, a clear indication of strong coupling, has been observed when the excitonic absorption band resonates with the cavity mode. LargeRabi splitting energies owing to the strong coupling of plasmons and excitons are clearly observed. (C) 2020 Optical Society of America
  • Article
    Citation - WoS: 24
    Citation - Scopus: 26
    Fiber Bragg Grating Regeneration at 450°c for Improved High Temperature Sensing
    (The Optical Society, 2019) Chah, Karima; Yüksel, Kıvılcım; Kinet, Damien; Yazd, Nazila Safari; Megret, Patrice; Caucheteur, Christophe
    Type-I fiber Bragg gratings photo-inscribed in hydrogen-loaded B/Ge co-doped silica single-mode optical fibers have been regenerated efficiently at 450 degrees C, which is the lowest temperature reported so far. The mechanical strength of the annealed fiber is preserved while ensuring temperature sensing of the regenerated gratings up to 900 degrees C. Unlike low temperature cycles (<= 600 degrees C), an annealing process at higher temperatures revealed faster regeneration for strong gratings. Changes in grating strength were also measured before the regeneration cycle. These behaviors suggest the contribution of different mechanisms to the regeneration process with different relative dynamics. (C) 2019 Optical Society of America.
  • Article
    Citation - WoS: 18
    Citation - Scopus: 46
    Phosphor-Based White Led by Various Glassy Particles:control Over Luminous Efficiency
    (The Optical Society, 2019) Yüce, Hürriyet; Güner, Tuğrul; Balcı, Sinan; Demir, Mustafa Muammer
    Generating white light through a mainstream remote phosphor design suffers from phosphor conversion efficiency loss due to a backscattering of light. Such a loss also reduces luminous efficiency of the resulting white light. To overcome this issue, various glassy scatterers with different morphologies such as glass bubbles, glass beads, and nanosized silica particles were employed as scatterers, together with a fixed amount of yellow phosphor (YAG:Ce3+) and a poly(dimethylsiloxane) (PDMS) matrix. In addition, the simulation of the system validates the rigorous multiple scattering of the incoming light most probably due to refractive index mismatch between the glass bubbles and surrounding PDMS matrix along with the internal reflections. (C) 2019 Optical Society of America
  • Article
    Citation - WoS: 19
    Citation - Scopus: 21
    Spectral Shadowing Suppression Technique in Phase-Otdr Sensing Based on Weak Fiber Bragg Grating Array
    (The Optical Society, 2019) de Miguel Soto, Veronica; Jason, Johan; Kurtoğlu, Deniz; Lopez-Amo, Manuel; Wuilpart, Marc
    A postprocessing procedure is presented to suppress spectral shadowing in phase-OTDR sensing systems based on a weak fiber Bragg grating array. A complete theoretical analysis of the interfering signals has been carried out to identify a compensation method. The proposed approach has been applied to simulated and experimental phase-OTDR in the context of vibration measurements. Fast Fourier transform has been employed to analyze the obtained results, which has verified the validity of the proposed method to suppress spectral shadowing. (C) 2019 Optical Society of America
  • Article
    Citation - WoS: 7
    Citation - Scopus: 7
    Demonstration of Pulse Controlled All-Optical Switch/Modulator
    (The Optical Society, 2014) Akın, Osman; Dinleyici, Mehmet Salih
    An all-optical pulse controlled switch/modulator based on evanescent coupling between a polymer slab waveguide and a single mode fiber is demonstrated. Very fast all-optical modulation/switching is achieved via Kerr effect of the nonlinear polymer placed in the evanescent region of the optical fiber. Local refractive index perturbation (δn = -1.45612 × 10 -5) on the thin film leads to 0.374 nW power modulation at the fiber output, which results in a switching efficiency of ≈1.5%.
  • Article
    Citation - WoS: 12
    Citation - Scopus: 12
    High Transmission Through a 90° Bend in a Polarization-Independent Single-Mode Photonic Crystal Waveguide
    (The Optical Society, 2015) Erol, Adem Enes; Sözüer, Hüseyin Sami
    We propose a polarization-independent single-mode waveguide, using a two-dimensional square photonic crystal with a complete band gap. The waveguide is tuned such that both TE and TM modes have the same group velocity and zero group velocity dispersion at the centergap frequency. We also present results for a 90° bend with transmission values of 98% for both modes.