Browsing by Author "Butun, S."

Now showing items 1-11 of 11

    • AlGaN-based high-performance metal-semiconductor-metal photodetectors 

      Gökkavas, M.; Butun, S.; Tur, T.; Bıyıklı, Necmi; Özbay, Ekmel (Elsevier BV, 2007-10)
      Design, structure growth, fabrication, and characterization of high performance AlGaN-based metal–semiconductor–metal (MSM) photodetectors (PD) are reported. By incorporating AlN nucleation and buffer layers, the leakage ...

    • E-Beam lithography designed substrates for surface enhanced Raman spectroscopy 

      Cinel, N. A.; Cakmakyapan, S.; Butun, S.; Ertas, G.; Özbay, Ekmel (Elsevier BV, 2015-06)
      Surface Enhanced Raman Spectroscopy (SERS) is a popular method that amplifies weak Raman signals from Raman-active analyte molecules making use of certain specially-prepared metallic surfaces. The main challenge in SERS ...

    • Electron beam lithography designed silver nano-disks used as label free nano-biosensors based on localized surface plasmon resonance 

      Cinel, N. A.; Butun, S.; Özbay, Ekmel (Optical Society of America, 2012-01-20)
      We present a label-free, optical nano-biosensor based on the Localized Surface Plasmon Resonance (LSPR) that is observed at the metaldielectric interface of silver nano-disk arrays located periodically on a sapphire substrate ...

    • 'Fairy Chimney'-Shaped Tandem Metamaterials as Double Resonance SERS Substrates 

      Cinel, N. A.; Butun, S.; Ertas, G.; Özbay, Ekmel (Wiley-VCH Verlag, 2012-10-12)
      A highly tunable design for obtaining double resonance substrates to be used in surface-enhanced Raman spectroscopy is proposed. Tandem truncated nanocones composed of Au-SiO2-Au layers are designed, simulated and fabricated ...

    • Integrated AlGaN quadruple-band ultraviolet photodetectors 

      Gökkavas, M.; Butun, S.; Caban, P.; Strupinski, W.; Özbay, Ekmel (IOP Publishing, 2012-04-27)
      Monolithically integrated quadruple back-illuminated ultraviolet metalsemiconductormetal photodetectors with four different spectral responsivity bands were demonstrated on each of two different Al xGa 1-xN heterostructures. ...

    • LSPR enhanced MSM UV photodetectors 

      Butun, S.; Cinel, N. A.; Özbay, Ekmel (IOP Publishing, 2012-10-18)
      We fabricated localized surface plasmon resonance enhanced UV photodetectors on MOCVD grown semi-insulating GaN. Plasmonic resonance in the UV region was attained using 36nm diameter Al nanoparticles. Extinction spectra ...

    • Mg-doped AlGaN grown on an AlN/sapphire template by metalorganic chemical vapour deposition 

      Yu, H.; Strupinski, W.; Butun, S.; Özbay, Ekmel (2006)
      The growth of high-performance Mg-doped p-type Al xGa 1-xN (x = 0.35) layers using low-pressure metal-organic chemical vapour deposition on an AlN/sapphire template is reported. The influence of growth conditions on the ...

    • Nanoantenna coupled UV subwavelength photodtectors based on GaN 

      Butun, S.; Cinel, N. A.; Özbay, Ekmel (Optical Society of America, 2012)
      The integration of nano structures with opto-electronic devices has many potential applications. It allows the coupling of more light into or out of the device while decreasing the size of the device itself. Such devices ...

    • The persistent photoconductivity effect in AIGaN/GaN heterostructures grown on sapphire and SiC substrates 

      Arslan, E.; Butun, S.; Lisesivdin, S. B.; Kasap, M.; Ozcelik, S.; Özbay, Ekmel (AIP Publishing LLC, 2008)
      In the present study, we reported the results of the investigation of electrical and optical measurements in Al(x)Ga(1-x)N/GaN heterostructures (x=0.20) that were grown by way of metal-organic chemical vapor deposition on ...

    • Solar-blind AlxGa1-xN-based avalanche photodiodes 

      Tut, T.; Butun, S.; Butun, B.; Gokkavas, M.; Yu, H. B.; Özbay, Ekmel (American Institute of Physics, 2005)
      We report the Metalorganic Chemical Vapor Deposition (MOCVD) growth, fabrication, and characterization of solar blind AlxGa1-xN/GaN-based avalanche photodiodes. The photocurrent voltage characteristics indicate a reproducible ...

    • Thermal tuning of infrared resonant absorbers based on hybrid gold-VO<inf>2</inf> nanostructures 

      Kocer H.; Butun, S.; Banar, B.; Wang, K.; Tongay, S.; Wu J.; Aydin, K. (American Institute of Physics Inc., 2015)
      Resonant absorbers based on plasmonic materials, metamaterials, and thin films enable spectrally selective absorption filters, where absorption is maximized at the resonance wavelength. By controlling the geometrical ...