Browsing by Subject "Defect formation"

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    Observation of defect formation in metamaterials
    (OSA, 2008-10) Çağlayan, Hümeyra; Bulu, I.; Loncar, M.; Özbay, Ekmel
    We report subwavelength localization of electromagnetic fields within cavities based on metamaterials. Cavity resonances are observed in the transmission spectrum of a split ring resonator and composite metamaterials cavity structures. These cavity resonances are shown to exhibit high quality factors. Since the unit cells of metamaterials are much smaller than the operation wavelength, subwavelength localization is possible within these metamaterial cavity structures. In the present paper, we show that the electromagnetic field is localized into a region of λ/8, where λ is the cavity resonance wavelength.
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    Reflection properties and defect formation in photonic crystals
    (A I P Publishing LLC, 1996-08-05) Özbay, Ekmel; Temelkuran, B.
    We have investigated the surface reflection properties of a layer-by-layer photonic crystal. By using a Fabry-Perot resonant cavity analogy along with the reflection-phase information of the photonic crystal, we predicted defect frequencies of planar defect structures. Our predictions were in good agreement with the measured defect frequencies. Our simple model can also predict and explain double defect formation within the photonic band gap.