Recent Submissions

  • Plasmonically enhanced hot electron based photovoltaic device 

    Atar, F. B.; Battal, E.; Aygun, L. E.; Daglar, B.; Bayindir, M.; Okyay, A. K. (OSA, 2013)
    Hot electron photovoltaics is emerging as a candidate for low cost and ultra thin solar cells. Plasmonic means can be utilized to significantly boost device efficiency. We separately form the tunneling metal-insulator-metal ...
  • Motion-compensated prediction based algorithm for medical image sequence compression 

    Oguz, S. H.; Gerek, O. N.; Cetin, A. E. (Elsevier, 1995-09)
    A method for irreversible compression of medical image sequences is described. The method relies on discrete cosine transform and motion-compensated prediction to reduce intra- and inter-frame redundancies in medical image ...
  • Solving the ME/ME/1 queue with state-space methods and the matrix sign function 

    Akar, N. (Elsevier, 2006-02)
    Matrix exponential (ME) distributions not only include the well-known class of phase-type distributions but also can be used to approximate more general distributions (e.g., deterministic, heavy-tailed, etc.). In this ...
  • An Optimized Isolation Network for the Wilkinson Divider 

    Tas, V.; Atalar, A. (IEEE, 2014)
    We propose an isolation network to simultaneously improve the input return loss, output return loss and isolation of the Wilkinson power divider in a wide bandwidth. The required even mode and odd mode reflection ...
  • Achievable Rates for Noisy Channels with Synchronization Errors 

    Rahmati, M.; Duman, T. (IEEE, 2014-11)
    We develop several lower bounds on the capacity of binary input symmetric output channels with synchronization errors, which also suffer from other types of impairments such as substitutions, erasures, additive white ...
  • Approximate Fourier Domain Expression for Bloch-Siegert Shift 

    Turk, E. A.; Ider, Y. Z.; Ergun, A. S.; Atalar, E. (Wiley, 2014-01-29)
    PurposeIn this study, a new simple Fourier domain-based analytical expression for the Bloch-Siegert (BS) shift-based B-1 mapping method is proposed to obtain vertical bar b(1)(+)vertical bar more accurately while using ...
  • Propagation of Mutual Intensity Expressed in terms of the Fractional Fourier Transform 

    Erden, M. F.; Ozaktas, H. M.; Mendlovic, D. (OSA Publising, 1996)
    The propagation of mutual intensity through quadratic graded-index media or free space can be expressed in terms of two-dimensional fractional Fourier transforms for one-dimensional systems and in terms of fourdimension ...
  • Optimized Dipole Antennas on Photonic Band gap crystals 

    Cheng, S. D.; Biswas, R.; Ozbay, E.; McCalmont, J. S.; Tuttle, G. (American Institute of Physics, 1995-09-25)
    Photonic band gap crystals have been used as a perfectly reflecting substrate for planar dipole antennas in the 12–15 GHz regime. The position, orientation, and driving frequency of the dipole antenna on the photonic band ...
  • Simulation of higher harmonics generation in tapping-mode atomic force microscopy 

    Sahin, O.; Atalar, A. (American Institute of Physics, 2001)
    In tapping-mode atomic force microscopy, nonlinear tip–sample interactions give rise to higher harmonics of the cantilever vibration. We present an electrical circuit to model the atomic force microscope cantilever with ...
  • Upper bounds on the capacity of deletion channels using channel fragmentation 

    Rahmati, M.; Duman, T. (IEEE, 2015-01)
    We study memoryless channels with synchronization errors as defined by a stochastic channel matrix allowing for symbol drop-outs or symbol insertions with particular emphasis on the binary and non-binary deletion channels. ...
  • A New Signal Representation based on the Fractional Fourier Transform: Definitions 

    Mendlovic, D.; Zalevsky, Z.; Dorsch, R.; Bitran, Y.; Lohmann, A. W. (OSA Publishing, 1995)
    The fractional Fourier transform is a mathematical operation that generalizes the well-known Fourier transform. This operation has been shown to have physical and optical fundamental meanings, and it has been experimentally ...
  • Design of dynamically adjustable anamorphic fractional Fourier transformer 

    Erden, M. F.; Ozaktas, H. M.; Sahin, A.; Mendlovic, D. (Elsevier, 1997-03-01)
    We form optical systems by using only free space portions and cylindrical lenses, and consider these systems as anamorphic fractional Fourier transformers. We dynamically adjust the transform order, scale factor and field ...
  • Sampling of the diffraction field 

    Onural, L. (Optical Society of America Publishing, 2000)
    When optical signals, like diffraction patterns, are processed by digital means the choice of sampling density and geometry is important during analog-to-digital conversion. Continuous band-limited signals can be sampled ...
  • Time-domain equivalent edge currents for transient scattering 

    Altintas, A.; Russer, P. (IEEE, 2001-04)
    Time-domain equivalent edge currents (TD-EEC) are developed for the transient scattering analysis. The development is based on the Fourier inversion of frequency domain equivalent edge current expressions. The time-domain ...
  • Fixed zeros of decentralized control systems 

    Unyelioglu, K. A.; Ozguner, U.; Ozguler, A. B. (IEEE, 2000-01)
    This paper considers the notion of decentralized fixed zeros for linear, time-invariant, finite-dimensional systems. For an N-channel plant that is free of unstable decentralized fixed modes, an unstable decentralized fixed ...
  • Decentralized Blocking Zeros and Decentralized Strong Stabilization Problem 

    Unyelioglu, K. A.; Ozguler, A. B.; Ozguner, U. (Taylor & Francis, 1995-01)
    This paper is concerned with a new system theoretic concept, decentralized blocking zeros, and its applications in the design of decentralized controllers for linear time-invariant finitedimensional systems. The concept ...
  • An efficient and accurate technique for the incident-wave excitations in the FDTD method 

    Oguz, U.; Gurel, L.; Arikan, O. (IEEE, 1998-06)
    An efficient technique to improve the accuracy of the finite-difference time-domain (FDTD) solutions employing incident-wave excitations is developed. In the separate-field formulation of the FDTD method, any incident ...
  • Anamorphic Fractional Fourier Transforming--Optical Implementation and Applications 

    Mendlovic, D.; Bitran, Y.; Dorsch, R. G.; Ferreira, C.; Garcia, J.; Ozaktas, H. M. (OSA Publishing, 1995-11-10)
    An additional degree of freedom is introduced to fractional-Fourier-transform systems by use of anamorphic optics. A different fractional Fourier order along the orthogonal principal directions is performed. A laboratory ...
  • Centimeter scale atomic force microscope imaging and lithography 

    Minne, S. C.; Adams, J. D.; Yaralioglu, G. G.; Manalis, S. R.; Atalar, A.; Quate, C. F. (American Institute of Physics, 1998-09-21)
    We present a 4 mm2 image taken with a parallel array of 10 cantilevers, an image spanning 6.4 mm taken with 32 cantilevers, and lithography over a 100 mm2 area using an array of 50 cantilevers. All of these results represent ...
  • Improving the accuracy of a time lens 

    Yurchenko, V. B. (Optical Society of America, 1997)
    A method for improving the accuracy of temporal imaging with an imperfect time lens is proposed. Signal distortion arising from complicated dispersion of the delay lines can be reduced considerably by appropriate choice ...

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