Researcher:
Yılmaz, Yiğit Ozan

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Master Student

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Yiğit Ozan

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Yılmaz

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Yılmaz, Yiğit Ozan

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2004 - 200942010 - 20141

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Researcher Of Publications: search.filters.isAuthorOfPublication.45eafe27-aac8-4f5c-88d0-6634d26e5bc3

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    Optical channel dropping with a silicon microsphere
    (Ieee-Inst Electrical Electronics Engineers Inc, 2005) N/A; N/A; Department of Physics; Department of Physics; Yılmaz, Yiğit Ozan; Demir, Abdullah; Kurt, Adnan; Serpengüzel, Ali; Master Student; Master Student; Teaching Faculty; Faculty Member; Department of Physics; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Sciences; College of Sciences; N/A; N/A; 194455; 27855
    We report the observation of morphology-dependent resonances from silicon microspheres. The dropped channels are observed both in the transmission and elastic scattering spectra in the O-band. The filter drops approximately 23% of the power at the resonance wavelength. The highest observed quality factor for the morphology-dependent resonances was on the order of 10(5). These resonances have a linewidth of 0.007 nm and a mode spacing of 0.19 nm.
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    Morphology dependent resonances from dielectric and semiconductor microspheres
    (IEEE, 2004) Department of Physics; Department of Physics; N/A; Serpengüzel, Ali; Kurt, Adnan; Yılmaz, Yiğit Ozan; Faculty Member; Teaching Faculty; Master Student; Department of Physics; College of Sciences; College of Sciences; Graduate School of Sciences and Engineering; 27855; 194455; N/A
    Morphology-dependent resonances of silicon and sapphire microspheres are excited by a tunable distributed feedback semiconductor laser. Resonance peaks in the elastic scattering spectra and associated dips in the transmission spectra are experimentally observed.
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    Elastic scattering from a sapphire microsphere placed on a silica optical fiber coupler: possible applications to biosensing
    (Springer Heidelberg, 2014) Murib, M. S.; Wagner, P.; N/A; N/A; Department of Physics; Department of Physics; Yılmaz, Yiğit Ozan; Demir, Abdullah; İşçi, Şenol; Bilici, Temel; Kurt, Adnan; Serpengüzel, Ali; Master Student; Master Student; Other; Teaching Faculty; Teaching Faculty; Faculty Member; Department of Physics; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Sciences; College of Sciences; N/A; N/A; 194455; 27855
    Elastic light scattering is performed in the original band of optical fiber communication at 1300 nm for a 500 mu m sapphire microsphere placed on a silica optical fiber half coupler. The morphology dependent resonances (MDRs) are observed in the transverse magnetically (TM) polarized and transverse electrically (TE) polarized 0. transmission and 90 degrees elastic scattering obtained from the sapphire microsphere. The TE and TM MDRs can be detected selectively with the use of a Glan polarizer. The TE and TM polarization selectivity provides the ability to select relative MDR to BG levels. The TM polarization provides higher MDR signal to background ratio (SBR) and is suitable for optical monitoring, biological sensing or any other optoelectronic application that requires a high resolution optical filter. The polar angular mode spacing of 0.36 nm of the resonances correlates well with the optical size of the sapphire microsphere. The autocorrelation of the 90 degrees elastic scattering spectra also shows peaks at 0.36 nm. The spectral linewidths of the resonances are on the order of 0.1 nm, which corresponds to quality factors on the order of 10(4.) A sapphire sphere with a radius of 500 mu m and relative refractive index of 1.31, resonances will red-shift by 1.01nm (0.077%). This shift is on the order of 10 linewidths, making sapphire biophotonic sensors an interesting alternative to silica biophotonic sensors.
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    PublicationOpen Access
    Semiconductor and dielectric microspheres for optoelectronic applications
    (Society of Photo-optical Instrumentation Engineers (SPIE), 2005) Department of Physics; Department of Electrical and Electronics Engineering; Serpengüzel, Ali; Yılmaz, Yiğit Ozan; Kurt, Adnan; Faculty Member; Master Student; Teaching Faculty; Department of Physics; Department of Electrical and Electronics Engineering; College of Sciences; 27855; N/A; 194455
    Microspheres possess high quality factor morphology-dependent resonances, i.e., whispering gallery modes. These resonances have narrow linewidths necessary for applications to compact optoelectronic devices for wavelength division multiplexing. The morphology dependent resonances have high quality factors of 104 and 105 with channel spacings of 0.14 nm in glass and 0.05 nm in silicon microspheres.
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    PublicationOpen Access
    Semiconductor and dielectric microsphere based channel dropping filters and detectors
    (Society of Photo-optical Instrumentation Engineers (SPIE), 2005) Department of Physics; Department of Electrical and Electronics Engineering; Serpengüzel, Ali; Yılmaz, Yiğit Ozan; Kurt, Adnan; Faculty Member; Master Student; Teaching Faculty; Department of Physics; Department of Electrical and Electronics Engineering; College of Sciences; 27855; N/A; 194455
    Dielectric and semiconductor microspheres coupled to optical fibers are used for optical channel dropping in the infrared communication wavelengths of 810 and 1300 nm. Additionally, a dielectric microsphere coupled to an optical fiber and placed in close proximity to a silicon photodiode is used for resonant detection of communication signals at 810 nm. The observed resonances have quality factors of 100.000. The measured quality factors are limited by the sensitivity of the measurement setup. These optical resonances provide the necessary narrow linewidths that are needed for high resolution optical communication applications. The microsphere, optical fiber, and detector system shows promise as a building block for optoelectronic integration.