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BULGAN, Erdal

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Erdal

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BULGAN
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2010 - 20113
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Now showing 1 - 3 of 3
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    Optical subwavelength-scale displacement sensing with dynamically controllable characteristics
    (The Optical Society, 2010) Bulgan, Erdal; Mechanical Engineering; BULGAN, Erdal
    Silicon photonic devices with embedded MEMS have significantly been studied. Characterization and operation of such devices in the nanometer-level is critical. A novel optical technique for subwavelength displacement measurements with dynamically controllable characteristics is introduced.
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    Connection characteristics of silicon nanowire waveguides and fabrication of physical contact switches
    (IEEE, 2010) Bulgan, Erdal; Kanamori, Y.; Hane, K.; Mechanical Engineering; BULGAN, Erdal
    Optical characteristics of silicon nanowire waveguide connections are studied both theoretically and experimentally. Effects of geometrical sizes and positional alignments on optical performance are investigated. Results show that waveguide connections with tips wider than 500 nm and tip angles greater than critical angle enable high transmittance and less sensitivity to positional misalignments. Connection with 1.5 mum-wide tip at 74deg tip angle is experimentally found to yield 96.3% transmittance at 200 nm offset distance. 1 times 2 mechanical switch using the aforementioned silicon nanowire waveguide geometry is designed and fabricated. Studied results are useful for realizing low-loss microelectromechanically-actuated connections in silicon subwavelength integrated optical circuits in the telecommunication field.
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    Low-loss optical switch using Brewster angle
    (IEEE, 2011) Kaykısız, Mustafa; Bulgan, Erdal; Mechanical Engineering; BULGAN, Erdal; Kaykısız, Mustafa
    Fabrication and actuation errors of submicron silicon waveguide optical switches are reported to remain within sub-100 nm ranges. These errors cause high loss ruining the optical performance of the switches at the on-state. Elliptical tips with tip angles about the Brewster angle are studied in an attempt to reduce the high-loss of such optical switches. Numerical computations are conducted in 3D Finite Difference Time Domain analysis. Optical performances at various distances both along and perpendicular to the light propagation directions are studied for tips with angles above and below the Brewster angle. Effect of fabrication and actuation errors on the performance of optical switch is reduced using tips with angles greater than Brewster angle. Transmittance of optical switch is calculated to be 94.69% when 1.5 μm-wide and 74º-angled waveguide tip geometry after two cascaded waveguide pairs is utilized.