Department of Electrical and Electronics Engineering

Optimization of a Collapsed Mode CMUT Receiver for Maximum Off-Resonance Sensitivity

Khan, M.; Khan, T. M.; Tasdelen, A. S.; Yilmaz, M.; Atalar, A.; Koymen, H. (Institute of Electrical and Electronics Engineers, 2018-07-28)

We propose an airborne collapse capacitive micromachined ultrasonic transducer (CMUT) as a practical viable ultrasound transducer capable of providing a stable performance at the off-resonance frequencies. Traditional ...

New high-resolution display device for holographic three-dimensional video: principles and simulations

Onural, Levent; Bozdağı, Gözde; Atalar, Abdullah (Bilkent University, 2017-08-03)

A new acousto-optical holographic display device, which is expected to solve the display resolution and refresh problems that are common to available holographic displays, is proposed. The device is based on the ...

Full Visible Range Covering InP/ZnS Nanocrystals with High Photometric Performance and Their Application to White Quantum Dot Light-Emitting Diodes

Yang, X.; Zhao, D.; Leck, K. S.; Tan, S. T.; Tang, Y. X.; Zhao, J.; Demir, H. V.; Sun, X. W. (Wiley-VCH Verlag, 2012-04-30)

High-quality InP/ZnS core–shell nanocrystals with luminescence tunable over the entire visible spectrum have been achieved by a facile one-pot solvothermal method. These nanocrystals exhibit high quantum yields (above 60%), ...

Experimental verification of metamaterial loaded small patch antennas

Alici, K. B.; Caliskan, M. D.; Ozbay, E. (Emerald Group Publishing Limited, 2013)

Purpose - Metamaterial unit cells composed of deep subwavelength resonators brought up new aspects to the antenna miniaturization problem. The paper experimentally demonstrates a metamaterial-inspired miniaturization method ...

Diffraction from a wavelet point of view

Onural, L. (Optical Society of America, 1993-06-01)

The system impulse response representing the Fresnel diffraction is shown to form a wavelet family of functions. The scale parameter of the wavelet family represents the depth (distance). This observation relates ...

Inertial navigation systems for mobile robots

Barshan, B.; Durrant Whyte, H. F. (IEEE, 1995-06)

A low-cost solid-state inertial navigation system (INS) for mobile robotics applications is described. Error models for the inertial sensors are generated and included in an Extended Kalman Filter (EKF) for estimating ...

Discretization error due to the identity operator in surface integral equations

Ergul, O.; Gurel, L. (Elsevier, 2009-10)

We consider the accuracy of surface integral equations for the solution of scattering and radiation problems in electromagnetics. In numerical solutions, second-kind integral equations involving welltested identity ...

Location and curvature estimation of spherical targets using multiple sonar time-of-flight measurements

Barshan, B. (IEEE, 1999)

A novel, flexible, three-dimensional multisensor sonar system is described to localize the center of a generalized spherical target and estimate its radius of curvature. Point, line, and planar targets are included as ...

Perspective projections in the space-frequency plane and fractional Fourier transforms

Yetik, I. S.; Ozaktas, H. M.; Barshan, B.; Onural, L. (OSA Publishing, 2000-07-06)

Perspective projections in the space-frequency plane are analyzed, and it is shown that under certain conditions they can he approximately modeled in terms of the fractional Fourier transform, The region of validity of the ...

Dual integrated actuators for extended range high speed atomic force microscopy

Sulchek, T.; Minne, S. C.; Adams, J. D.; Fletcher, D. A.; Atalar, A.; Quate, C. F.; Adderton, D. M. (American Institute of Physics, 1999-09-13)

A flexible system for increasing the throughput of the atomic force microscope without sacrificing imaging range is presented. The system is based on a nested feedback loop which controls a micromachined cantilever that ...

Beaming of light and enhanced transmission via surface modes of photonic crystals

Bulu, I.; Caglayan, H.; Ozbay, E. (Optical Society of America, 2005-11-15)

We report beaming and enhanced transmission of electromagnetic waves by use of surface corrugated photonic crystals. The modes of a finite-size photonic crystal composed of dielectric rods in free space have been analyzed ...

Target differentiation with simple infrared sensors using statistical pattern recognition techniques

Barshan, B.; Aytac, T.; Yuzbasioglu, C. (Elsevier, 2007-10)

This study compares the performances of various statistical pattern recognition techniques for the differentiation of commonly encountered features in indoor environments, possibly with different surface properties, using ...

Influence of Channel Layer Thickness on the Electrical Performances of Inkjet-Printed In-Ga-Zn Oxide Thin-Film Transistors

Wang, Y.; Sun, X. W.; Goh, G. K. L.; Demir, H. V.; Yu, H. Y. (IEEE, 2011-02)

Inkjet-printed In-Ga-Zn oxide (IGZO) thin-film transistors (TFTs) with bottom-gate bottom-contact device architecture are studied in this paper. The impact of the IGZO film thickness on the performance of TFTs is investigated. ...

Silicon nanoparticle charge trapping memory cell

El Atab, N.; Ozcan, A.; Alkis, S.; Okyay, A. K.; Nayfeh, A. (WILEY-VCH Verlag, 2014-05-12)

A charge trapping memory with 2 nm silicon nanoparticles (Si NPs) is demonstrated. A zinc oxide (ZnO) active layer is deposited by atomic layer deposition (ALD), preceded by Al2O3 which acts as the gate, blocking and ...

Spectrally Effiecient Alamouti Code Structure in Asynchronous Cooperative Systems

Rahmati, M.; Duman, T. (IEEE, 2014-05)

A relay communication system with two amplify and forward (AF) relays under flat fading channel conditions is considered where the signals received from the relays are not necessarily time aligned. We propose a new ...

Enhanced photoresponse of conformal TiO2/Ag nanorod array-based Schottky photodiodes fabricated via successive glancing angle and atomic layer deposition

Haider, A.; Cansizoglu, H.; Cansizoglu, M. F.; Karabacak, T.; Okyay, A. K.; Biyikli, N. (American Vacuum Society, 2015-01/02)

In this study, the authors demonstrate a proof of concept nanostructured photodiode fabrication method via successive glancing angle deposition (GLAD) and atomic layer deposition (ALD). The fabricated metal-semiconductor ...