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  Projection onto Epigraph Sets for Rapid Self-Tuning Compressed Sensing MRI 

  Shahdloo, Mohammad; Ilicak, Efe; Tofighi, Mohammad; Saritas, Emine U.; Çetin, A. Enis; Çukur, Tolga (IEEE, 2018-12-07)

  The compressed sensing (CS) framework leverages the sparsity of MR images to reconstruct from undersampled acquisitions. CS reconstructions involve one or more regularization parameters that weigh sparsity in transform ...
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  Optimization of a Collapsed Mode CMUT Receiver for Maximum Off-Resonance Sensitivity 

  Khan, M.; Khan, T. M.; Tasdelen, A. S.; Yilmaz, M.; Koymen, H.; Atalar, Abdullah (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 ...
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  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 ...
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  Self-aligning planarization and passivation for integration applications in III-V semiconductor devices 

  Demir, H. V.; Zheng, J. F.; Sabnis, V. A.; Fidaner, O.; Hanberg, J. P.; Harris, J. S.; Miller, D. A. B. (IEEE, 2005)

  This paper reports an easy planarization and passivation approach for the integration of III-V semiconductor devices. Vertically etched III-V semiconductor devices typically require sidewall passivation to suppress leakage ...
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  Near resonant third-order optical nonlinearities of colloidal InP/ZnS quantum dots 

  Wang, Y.; Yang, X.; He, T. C.; Gao, Y.; Demir, H. V.; Sun, X. W.; Sun, H. D. (AIP Publishing, 2013)

  We have investigated the third-order optical nonlinearities of high-quality colloidal InP/ZnS core-shell quantum dots (QDs) using Z-scan technique with femtosecond pulses. The two-photon absorption cross-sections as high ...
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  A fast-switching light-writable and electric-erasable negative photoelectrochromic cell based on Prussian blue films 

  Jiao, Z.; Song, J. L.; Sun, X. W.; Liu, X. W.; Wang, J. M.; Ke, L.; Demir, H. V. (Elsevier, 2012-03)

  We report a fast-switching negative photoelectrochromic cell composed of a dye-sensitized nanocrystalline TiO2 electrode and Prussian blue counter electrode sandwiching a LiI electrolyte. The cell can be bleached under ...
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  Multifunctional integrated photonic switches 

  Demir, H. V.; Sabnis, V. A.; Fidaner, O.; Harris, J. S.; Miller, D. A. B.; Zheng, J. F. (IEEE, 2005-02-22)

  Traditional optical-electronic-optical (o-e-o) conversion in today's optical networks requires cascading separately packaged electronic and optoelectronic chips and propagating high-speed electrical signals through and ...
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  Solution Processed Tungsten Oxide Interfacial Layer for Efficient Hole-Injection in Quantum Dot Light-Emitting Diodes 

  Yang, X.; Mutlugun, E.; Zhao, Y.; Gao, Y.; Leck, K. S.; Ma, Y.; Ke, L.; Tan, S. T.; Demir, H. V.; Sun, X. W. (Wiley-VCH Verlag, 2014)

  A highly efficient and stable QLED using an inorganic WO3 nanoparticle film as a hole injection layer is demonstrated.The resulting WO3 nanoparticle-based QLEDs also exhibit superior performance compared to that of the ...
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  Plasmonic light-sensitive skins of nanocrystal monolayers 

  Akhavan, S.; Gungor, K.; Mutlugun, E.; Demir, H. V. (IOP Publishing, 2013)

  We report plasmonically coupled light-sensitive skins of nanocrystal monolayers that exhibit sensitivity enhancement and spectral range extension with plasmonic nanostructures embedded in their photosensitive nanocrystal ...
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  Transition metal oxides on organic semiconductors 

  Zhao, Y.; Zhang, J.; Liu, S.; Gao, Y.; Yang, X.; Leck, K. S.; Abiyasa, A. P.; Divayana, Y.; Mutlugun, E.; Tan, S. T.; Xiong, Q.; Demir, H. V.; Sun, X. W. (Elsevier, 2014-04)

  Transition metal oxides (TMOs) on organic semiconductors (OSs) structure has been widely used in inverted organic optoelectronic devices, including inverted organic light-emitting diodes (OLEDs) and inverted organic solar ...
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  Plasmonic backcontact grating for P3HT:PCBM organic solar cells enabling strong optical absorption increased in all polarizations 

  Sefunc, M. A.; Okyay, A. K.; Demir, H. V. (Optical Society of America, 2011)

  In P3HT:PCBM based organic solar cells we propose and demonstrate numerically plasmonic backcontact grating architectures for strong optical absorption enhanced in both transverse-magnetic and transverse-electric polarizations. ...
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  Enhanced efficiency of solution-processed small-molecule solar cells upon incorporation of gold nanospheres and nanorods into organic layers 

  Xu, X.; Kyaw, A. K. K.; Peng, B.; Du, Q.; Hong, L.; Demir, H. V.; Wong, T. K. S.; Xiong, Q.; Sun, X. W. (Royal Society of Chemistry, 2014)

  The significantly enhanced performance upon incorporation of Au nanoparticles in solution-processed small-molecule solar cells is demonstrated. Simultaneously incorporating Au nanospheres into the hole transport layer and ...
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  On the effect of N-GaN/P-GaN/N-GaN/P-GaN/N-GaN built-in junctions in the n-GaN layer for InGaN/GaN light-emitting diodes 

  Kyaw, Z.; Zhang, Z. H.; Liu, W.; Tan, S. T.; Ju, Z. G.; Zhang, X. L.; Ji, Y.; Hasanov, N.; Zhu, B.; Lu, S.; Zhang, Y.; Sun, X. W.; Demir, H. V. (Optical Society of America, 2014-01-07)

  N-GaN/P-GaN/N-GaN/P-GaN/N-GaN (NPNPN-GaN) junctions embedded between the n-GaN region and multiple quantum wells (MQWs) are systematically studied both experimentally and theoretically to increase the performance of InGaN/GaN ...
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  Nonradiative energy transfer in colloidal CdSe nanoplatelet films 

  Guzelturk, B.; Olutas, M.; Delikanli, S.; Kelestemur, Y.; Erdem, O.; Demir, H. V. (Royal Society of Chemistry, 2015)

  Nonradiative energy transfer (NRET) has been extensively studied in colloidal nanocrystal (quantum dots) and nanorod (quantum wires) assemblies. In this work, we present the first account of spectroscopic evidence of NRET ...
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  Photogeneration of hot plasmonic electrons with metal nanocrystals: Quantum description and potential applications 

  Govorov, A. O.; Zhang, H.; Demir, H. V.; Gunko, Y. K. (Elsevier, 2014-02)

  he paper reviews physical concepts related to the collective dynamics of plasmon excitations in metal nanocrystals with a focus on the photogeneration of energetic carriers. Using quantum linear response theory, we analyze ...
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  Nanocrystal Skins with Exciton Funneling for Photosensing 

  Akhavan, S.; Cihan, A. F.; Bozok, B.; Demir, H. V. (Wiley-VCH Verlag, 2014-03-05)

  Highly photosensitive nanocrystal (NC) skins based on exciton funneling are proposed and demonstrated using a graded bandgap profile across which no external bias is applied in operation for light-sensing. Four types of ...
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  Material Binding Peptides for Nanotechnology 

  Seker, U. O. S.; Demir, H. V. (MDPI AG, 2011)

  Remarkable progress has been made to date in the discovery of material binding peptides and their utilization in nanotechnology, which has brought new challenges and opportunities. Nowadays phage display is a versatile ...
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  Quantum Dot Light-Emitting Diode with Quantum Dots Inside the Hole Transporting Layers 

  Leck, K. S.; Divayana, Y.; Zhao, D.; Young, X.; Abiyasa, A. P.; Mutlugun, E.; Gao, Y.; Liu, S.; Tan, S. T.; Sun, X. W.; Demir, H. V. (American Chemical Society, 2013)

  We report a hybrid, quantum dot (QD)-based, organic light-emitting diode architecture using a noninverted structure with the QDs sandwiched between hole transporting layers (HTLs) outperforming the reference device structure ...
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  Light extraction efficiency enhancement of colloidal quantum dot light-emitting diodes using large-scale nanopillar arrays 

  Yang, X.; Dev, K.; Wang, J.; Mutlugun, E.; Dang, C.; Zhao, Y.; Liu, S.; Tang, Y.; Tan, S. T.; Sun, X. W.; Demir, H. V. (Wiley-VCH Verlag, 2014)

  A colloidal quantum dot light-emitting diode (QLED) is reported with substantially enhanced light extraction efficiency by applying a layer of large-scale, low-cost, periodic nanopillar arrays. Zinc oxide nanopillars are ...
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  Optoelectronic switches based on diffusive conduction 

  Demir, H. V.; Koklu, H.; Yairi, M. B.; Harris, J. S.; Miller, D. A. B. (American Institute of Physics, 2006)

  We study the process of diffusive conduction that we use in our optoelectronic switches to achieve rapid optical switching (on a picosecond time scale). We present the characteristic Green's function of the diffusive ...

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