Researcher:
Yılmaz, Huzeyfe

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Master Student

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Huzeyfe

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Yılmaz

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Yılmaz, Huzeyfe

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2011 - 20175

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Researcher Of Publications: search.filters.isAuthorOfPublication.1ecf2924-53c8-449a-9d72-d633dba6d5cb

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Now showing 1 - 5 of 5
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    Silicon microsphere based filtering application for near-infrared optical fiber based telecommunication
    (IEEE, 2011) Tamer, Mehmet Selman; Gurlu, Oguzhan; N/A; N/A; Department of Physics; Yılmaz, Huzeyfe; Gökay, Ulaş Sabahattin; Serpengüzel, Ali; Master Student; PhD Student; Faculty Member; Department of Physics; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Sciences; N/A; N/A; 27855
    We demonstrate an optical filter based on the resonances of a silicon microsphere in the near-IR O-Band. The 1300 nm laser light is coupled to the silicon microsphere and optical resonances are observed as dips in the transmission spectrum.
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    Silicon microspheres for optoelectronics
    (IEEE, 2011) Department of Physics; Serpengüzel, Ali; Murib, Mohammed Sharif; Yılmaz, Huzeyfe; Faculty Member; PhD Student; Master Student; Department of Physics; College of Sciences; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; 27855; N/A; N/A
    Optoelectronic properties of silicon microspheres are explored. The IV characteristics show an electrical response similar to two back-to-back Schottky diodes. Optical resonances with Q-factors of 105 are observable in the elastic scattering spectra.
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    Fiber optic excitation of silicon microspheres in amorphous and crystalline fluids
    (Taylor and Francis Inc, 2016) N/A; N/A; N/A; Department of Physics; Yılmaz, Huzeyfe; Yılmaz, Hasan; Murib, Mohammed Sharif; Serpengüzel, Ali; Master Student; N/A; PhD Student; Faculty Member; Department of Physics; Graduate School of Sciences and Engineering; N/A; Graduate School of Sciences and Engineering; College of Sciences; N/A; N/A; N/A; 27855
    This study investigates the optical resonance spectra of free-standing monolithic single crystal silicon microspheres immersed in various amorphous fluids, such as air, water, ethylene glycol, and 4-Cyano-4'-pentylbiphenyl nematic liquid crystal. For the various amorphous fluids, morphology-dependent resonances with quality factors on the order of 10(5) are observed at 1428 nm. The mode spacing is always on the order of 0.23 nm. The immersion in various amorphous fluids affects the spectral response of the silicon microsphere and heralds this technique for use in novel optofluidics applications. Even though the nematic liquid crystal is a highly birefringent, scattering, and high-index optical medium, morphology-dependent resonances with quality factors on the order of 10(5) are observed at 1300 nm in the elastic scattering spectra of the silicon microsphere, realizing a liquid-crystal-on-silicon geometry. The relative refractive index and the size parameter of the silicon microsphere are the parameters that affect the resonance structure. The more 4-Cyano-4'-pentylbiphenyl interacting with the silicon microsphere, the lower the quality factor of the resonances is. The more 4-Cyano-4'-pentylbiphenyl is interacting with the silicon microsphere, the lower the mode spacing of the resonances is. The silicon microspheres wetted with nematic liquid crystal can be used for optically addressed liquid-crystal-on-silicon displays, light valve applications, or reconfigurable optical networks.
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    Whispering-gallery modes observed in elastic scattering from submerged high-refractive-index silica microspheres
    (Society of Photo-optical Instrumentation Engineers (SPIE), 2017) Tamer, M. S.; Gurlu, O.; Department of Physics; Yılmaz, Hasan; Yılmaz, Huzeyfe; Murib, Mohammed Sharif; Serpengüzel, Ali; Master Student; Master Student; Faculty Member; Department of Physics; College of Sciences; N/A; N/A; N/A; 27855
    The effect of the discrete values of the refractive index of the surrounding medium on the spectral behavior of the whispering-gallery modes (WGMs) in the elastic scattering spectra of high-refractive-index silica microspheres submerged in fluids, such as air, water, and glycerol, is studied. The elastic scattering spectral measurements, as well as the spectral autocorrelation analysis of these elastic scattering spectra show that the spectral-mode spacing, the spectral-mode density, and the spectral-mode definition of the WGMs decrease as the refractive index of the surrounding fluid increases. We believe that this work opens up the way for optofluidic applications of high-refractive-index silica microsphere-based guided wave optics.
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    PublicationOpen Access
    Electro-optical modulation with silicon microspheres in liquid crystal
    (Society of Photo-optical Instrumentation Engineers (SPIE), 2011) Department of Physics; Serpengüzel, Ali; Yılmaz, Huzeyfe; Faculty Member; Master Student; Department of Physics; College of Sciences; 27855; N/A
    We demonstrate electro-optical tuning and modulation of the optical resonances of a silicon microsphere placed on an optical fiber half coupler and immersed in a nematic liquid crystal. The relative refractive index between the microsphere and the liquid crystal is controlled by an applied external AC electric field. The tuning and modulation of the microsphere optical resonances is monitored with the transmission and elastic scattering signals.