Researcher:
Yılmaz, Hasan

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Master Student

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Hasan

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Yılmaz

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Yılmaz, Hasan

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2009 - 200912010 - 20173

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Researcher Of Publications: search.filters.isAuthorOfPublication.5dbcdfd1-064b-4f6b-8994-b37f17a6f223

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Now showing 1 - 4 of 4
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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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    Optical modulation with a ruby microsphere in liquid crystal
    (Ieee, 2009) Beccherelli, Romeo; Department of Physics; N/A; N/A; Serpengüzel, Ali; Murib, Mohammed Sharif; Yılmaz, Hasan; 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; 337846
    Optical spectra of a hybrid device consisting of a ruby microsphere and nematic liquid crystal are calculated at different voltages applied to the liquid crystal. A wavelength shift of 0.11 nm is observed for resonances with mode spacing of 1.6 nm.
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    PublicationOpen Access
    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
    Tuning of optical resonances of a microsphere with liquid crystal
    (Society of Photo-optical Instrumentation Engineers (SPIE), 2011) Tamer, Mehmet Selman; Gürlü, Oğuzhan; Department of Physics; Serpengüzel, Ali; Yılmaz, Hasan; Faculty Member; Department of Physics; College of Sciences; 27855; N/A
    Optical resonances are observed in the elastic light scattering form high refractive index glass microspheres placed on a single mode optical fiber coupler and in a liquid crystal. Placing the liquid crystal on the optical fiber coupler increases the non-resonant scattering, whereas placing the liquid crystal away from the optical coupler increases the resonant scattering. Optical resonances blue and red shift due to the placement and removal of the liquid crystal.