Now showing items 1-20 of 20

    • 1.3 μm GaAs based resonant cavity enhanced Schottky barrier internal photoemission photodetector 

      Necmi, B.; Kimukin, I.; Özbay, Ekmel; Tuttle, G. (IEEE, Piscataway, NJ, United States, 2000)
      GaAs based photodetectors operating at 1.3 μm that depend on internal photoemission as the absorption mechanism were fabricated. Quantum efficiency (QE) was increased using resonant cavity enhancement (RCE) effect.
    • Analysis of the complex light field generated by a deflectable mirror array device 

      Ulusoy, Erdem; Onural, Levent; Özaktaş, Haldun M. (SPIE, 2006)
      An exact analysis of the scalar coherent monochromatic light field produced by a deflectable mirror array device is presented. The three-dimensional light field is related to the tilt angles of the mirrors. The first ...
    • Determination of Plasma Temperature of Copper Vapour laser 

      Namnabat, M.; Behrouzinia, S.; Moradi, A. R.; Khorasani, K. (Cambridge University Press, 2016)
      The output power and the temperature profile of a copper vapour laser were investigated versus frequency with various kinds of back mirror in its resonator cavity. A semi-experimental method was used for measuring the ...
    • Fabrication of high-speed resonant cavity enhanced schottky photodiodes 

      Özbay, Ekmel; Islam, M. S.; Onat, B.; Gökkavas, M.; Aytür, O.; Tuttle, G.; Towe, E.; Henderson, R. H.; Ünlü, M. S. (Institute of Electrical and Electronics Engineers, 1997-05)
      We report the fabrication and testing of a GaAs-based high-speed resonant cavity enhanced (RCE) Schottky photodiode. The top-illuminated RCE detector is constructed by integrating a Schottky contact, a thin absorption ...
    • Femtosecond optical parametric oscillator based on periodically poled KTiOPO4 

      Kartaloğlu, T.; Köprülü, K. G.; Aytür, O.; Sundheimer, M.; Risk, W. P. (1998-01-01)
      We report a femtosecond optical parametric oscillator based on a periodically poled KTiOPO4 crystal for which quasi-phase matching is achieved with a 24-μm poling period. The singly resonant parametric oscillator, synchronously ...
    • Fractional Fourier transform as a tool for analyzing beam propagation and spherical mirror resonators 

      Özaktaş, Haldun M.; Mendlovic, D. (Optical Society of America, 1994)
      The complex amplitude distributions on two spherical reference surfaces of given curvature and spacing are simply related by a fractional Fourier transform. The order of the fractional Fourier transform is proportional to ...
    • High-performance ALGaN-based visible-blind resonant cavity enhanced Schottky photodiodes 

      Kimukin, İbrahim; Bıyıklı, Necmi; Kartaloğlu, Tolga; Aytür, Orhan; Özbay, Ekmel (Materials Research Society, 2003-04)
      We have designed, fabricated and tested resonant cavity enhanced visible-blind AlGaN-based Schottky photodiodes. The bottom mirror of the resonant cavity was formed with a 20 pair AlN/AlGaN Bragg mirror. The devices were ...
    • High-performance ITO-AlAs/GaAs based resonant cavity enhanced Schottky photodiodes 

      Özbay, Ekmel; Bıyıklı, Necmi; Kimukin, İbrahim; Aytür, Orhan (IEEE, 1999)
      The fabrication of ITO (indium tin oxide)-AlAs-based resonant cavity enhanced Schottky photodiodes was examined. The device structure was designed to achieve a low-loss cavity around a 840 nm optical communication window. ...
    • High-speed 1.55 μm operation of low-temperature-grown GaAs-based resonant-cavity-enhanced p-i-n photodiodes 

      Butun, B.; Bıyıklı, Necmi; Kimukin, I.; Aytur, O.; Özbay, Ekmel; Postigo, P. A.; Silveira, J. P.; Alija, A. R. (American Institute of Physics, 2004)
      The 1.55 μm high-speed operation of GaAs-based p-i-n photodiodes was demonstrated and their design, growth and fabrication were discussed. A resonant-cavity-detector structure was used to selectively enhance the photoresponse ...
    • High-speed transparent indium-tin-oxide based resonant cavity Schottky photodiode with Si/sub 3/N/sub 4//SiO/sub 2/ top Bragg mirror 

      Bıyıklı, Necmi; Kimukin, I.; Aytur, O.; Özbay, Ekmel; Gokkavas, M.; Unlu, S. (IEEE, Piscataway, NJ, United States, 2000)
      Photodetectors demonstrating high bandwidth-efficiency (BWE) products are required for high-performance optical communication and measurement systems. For conventional photodiodes the BWE product is limited due to the ...
    • Imaging flaws close to surface using focused surface acoustic waves 

      Köymen, Hayrettin; Atalar, Abdullah; Çiloğlu, T.; Önder, Murat; Uzel, Ç.; Yavuz, H. (IEEE, 1986-11)
      The resolving power and detection ability of the focused surface acoustic wave (SAW) imaging modality is investigated in this paper. In this mode of imaging, conical bulk acoustic waves are used to generate and focus leaky ...
    • Method to enlarge the hologram viewing window using a mirror module 

      Kang H.; Ohmura, N.; Yamaguchi, T.; Yoshikawa H.; Kim, S.-C.; Kim, E.-S. (2009)
      A liquid crystal panel for a video projector is often used for holographic television. However, its pixel size and pixel number are not enough for practical holographic 3-D display. Therefore, a multipanel configuration ...
    • Phase-matched self-doubling optical parametric oscillator 

      Kartaloğlu, T.; Köprülü, K. G.; Aytür, O. (Optical Society of America, 1997-03-01)
      We report a synchronously pumped intracavity frequency-doubled optical parametric oscillator that employs a single KTiOPO4 crystal for both parametric generation and frequency doubling. Both nonlinear processes are phase ...
    • Photoluminescence from a VCSEL structure a-SiNx:H microcavity 

      Serpengüzel, A.; Darici, Y. (IEEE, 1999)
      Microcavity effects on the photoluminescence (PL) of porous Si has already been reported. Recently, we have observed visible and near infrared (IR) PL from hydrogenated amorphous Si nitride (a-SiNx:H) grown by low temperature ...
    • Resonant cavity-enhanced detectors embedded in photonic crystals 

      Temelkuran, Burak; Özbay, Ekmel (IEEE, 1996)
      Summary form only given. We demonstrate the resonant-cavity-enhanced effect by placing microwave detectors in a layer-by-layer photonic crystal. We used the output of a network analyzer as the microwave source, and fed the ...
    • A self-doubling optical parametric oscillator based on aperiodically-poled lithium niobate 

      Kartaloǧlu, Tolga; Figen, Ziya Gürkan; Aytür, Orhan (IEEE, 2001)
      A self-doubling optical parametric oscillator (SDOPO) having one-dimensional aperiodic grating structure based on a LiNbO3 crystal was constructed. The structure was designed to quasi-phase-match both second harmonic ...
    • Signal processing problems and algorithms in display side of 3DTV 

      Ulusoy, E.; Esmer, Gökhan Bora; Özaktaş, Haldun M.; Onural, Levent; Gotchev, A.; Uzunov, V. (IEEE, 2006-10)
      Two important signal processing problems in the display side of a holographic 3DTV are the computation of the diffraction field of a 3D object from its abstract representation, and determination of the best display ...
    • Super-radiant surface emission from a quasi-cavity hot electron light emitter 

      O'Brien, A.; Balkan, N.; Boland-Thoms, A.; Adams, M.; Bek, A.; Serpengüzel, A.; Aydınlı, A.; Roberts, J. (Springer New York LLC, 1999)
      The Hot Electron Light Emitting and Lasing in Semiconductor Heterostructure (HELLISH-1) device is a novel surface emitter which utilises hot carrier transport parallel to the layers of a Ga1 - xAlxAs p-n junction incorporating ...
    • Ultrafast and highly efficient resonant cavity enhanced photodiodes 

      Özbay, Ekmel; Kimukin, İbrahim; Bıyıklı, Necmi (SPIE, 2003-09)
      In this talk, we will review our research efforts on resonant cavity enhanced (RCE) high-speed high-efficiency photodiodes (PDs) operating in the 1st and 3rd optical communication windows. Using a microwave compatible ...
    • V(Z) of the surface acoustic wave focusing system 

      Atalar, Abdullah; Köymen, Hayrettin (IEEE, 1986-11)
      It is possible to define a V(Z) function for the surface acoustic wave (SAW) focusing system for a class of reflectors similar to that defined in acoustic microscopy. In this case V(Z) is a function which relates the ...