Browsing by Subject "Nanocylinders"
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Item Open Access Plasmonic nano-bio sensors for detection of E-coli bacteria(IEEE, 2009) Cinel, Neval A.; Bütün, Serkan; Çalışkan, Deniz; Özbay, EkmelBiological sensors, that rely on localized surface plasmon resonance exhibited by metallic nanocylinders fabricated using electron beam lithography and functionalized with the immobilization of biotin conjugated E-coli antibodies are investigated in this study.Item Open Access SILVER nano-cylinders designed by EBL used as label free LSPR nano-biosensors(SPIE, 2011) Cinel, Neval A.; Bütün, Serkan; Özbay, EkmelLocalized Surface Plasmon Resonance (LSPR) is based on the electromagnetic-field enhancement of metallic nano-particles. It is observed at the metal-dielectric interface and the resonance wavelength can be tuned by the size, shape, and periodicity of the metallic nanoparticles and the surrounding dielectric environment. This makes LSPR a powerful candidate in bio-sensing. In the present work, the size and period dependency of the LSPR wavelength was studied through simulations and fabrications. The surface functionalization, that transforms the surface into a sensing platform was done and verified. Finally, the concentration dependency of the LSPR shifts was observed. All the measurements were done by a transmission set-up. The study is at an early stage, however results are promising. The detection of specific bacteria species can be made possible with such a detection method. © 2011 SPIE.Item Open Access Spectral response modification of TiO2 MSM photodetector with an LSPR filter(Optical Society of America, 2014) Caliskan, D.; Butun, B.; Ozcan, S.; Özbay, EkmelWe fabricated UVB filtered TiO2 MSM photodetectors by the localized surface plasmon resonance effect. A plasmonic filter structure was designed using FDTD simulations. Final filter structure was fabricated with Al nano-cylinders with a 70 nm radius 180 nm period on 360 nm SiO2 film. The spectral response of the TiO2 MSM photodetector was modified and the UVB response was reduced by approx. 60% with an LSPR structure, resulting in a peak responsivity shift of more than 40 nm. To our knowledge, this is the first published result for the spectral response modification of TiO2 photodetectors with LSPR technique. © 2014 Optical Society of America.