Browsing by Author "Dana, A."
Now showing items 1-20 of 46
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All-aluminum hierarchical plasmonic surfaces in the infrared
Ayas S.; Bakan, G.; Dana, A. (The Optical Society, 2016)All-Aluminum metal-insulator-metal resonator structures withmultiple metal-insulator stacks showing resonances in the mid-infrared(MIR) are fabricated. Ultrathin native Al2O3 is used as the insulator layersenabling simple ... -
All-chalcogenide glass omnidirectional photonic band gap variable infrared filters
Kondakci, H. E.; Yaman, M.; Koylu, O.; Dana, A.; Bayındır, Mehmet (AIP Publishing, 2009)We report on the design, fabrication, and characterization of spatially variable infrared photonic band gap filter that consists of thermally evaporated, high refractive indexcontrast, amorphous chalcogenide glass multilayers. ... -
Atomic force microscopy for the investigation of molecular and cellular behavior
Ozkan A.D.; Topal, A. E.; Dana, A.; Güler, Mustafa O.; Tekinay, A. B. (Elsevier, 2016-10)The present review details the methods used for the measurement of cells and their exudates using atomic force microscopy (AFM) and outlines the general conclusions drawn by the mechanical characterization of biological ... -
Colorimetric detection of ultrathin dielectrics on strong interference coatings
Ayas S.; Bakan, G.; Ozgur E.; Celebi, K.; Torunoglu, G.; Dana, A. (OSA - The Optical Society, 2018)Metal films covered with ultrathin lossy dielectrics can exhibit strong interference effects manifested as the broad absorption of the incident light resulting in distinct surface colors. Despite their simple bilayer ... -
Counting molecules with a mobile phone camera using plasmonic enhancement
Ayas S.; Cupallari, A.; Ekiz, O. O.; Kaya, Y.; Dana, A. (American Chemical Society, 2014)Plasmonic field enhancement enables the acquisition of Raman spectra at a single molecule level. Here we investigate the detection of surface enhanced Raman signal using the unmodified image sensor of a smart phone, ... -
The design and fabrication of supramolecular semiconductor nanowires formed by benzothienobenzothiophene (BTBT)-conjugated peptides
Khalily, M. A.; Usta, H.; Ozdemir, M.; Bakan, G.; Dikecoglu, F. B.; Edwards-Gayle, C.; Hutchinson, J. A.; Hamley, I. W.; Dana, A.; Güler, Mustafa O. (Royal Society of Chemistry, 2018)π-Conjugated small molecules based on a [1]benzothieno[3,2-b]benzothiophene (BTBT) unit are of great research interest in the development of solution-processable semiconducting materials owing to their excellent charge-transport ... -
Excited-state dynamics and nonlinear optical response of Ge nanocystals embedded in silica matrix
Razzani, L.; Gnoli, A.; Righini, M.; Dana, A.; Aydınlı, Atilla (A I P Publishing LLC, 2006-05-01)We use a dedicated Z-scan setup, arranged to account for cumulative effects, to study the nonlinear optical response of Ge nanocrystals embedded in silica matrix. Samples are prepared with plasma-enchanced chemical-vapor ... -
Exploiting native Al2O3 for multispectral aluminum plasmonics
Ayas S.; Topal, A. E.; Cupallari, A.; Güner, H.; Bakan, G.; Dana, A. (American Chemical Society, 2014)Aluminum, despite its abundance and low cost, is usually avoided for plasmonic applications due to losses in visible/infrared regimes and its interband absorption at 800 nm. Yet, it is compatible with silicon CMOS processes, ... -
Extracting the temperature distribution on a phase-change memory cell during crystallization
Bakan, G.; Gerislioglu, B.; Dirisaglik, F.; Jurado, Z.; Sullivan, L.; Dana, A.; Lam, C.; Gokirmak A.; Silva, H. (American Institute of Physics Inc., 2016-10)Phase-change memory (PCM) devices are enabled by amorphization- and crystallization-induced changes in the devices' electrical resistances. Amorphization is achieved by melting and quenching the active volume using short ... -
Fabrication of supramolecular n/p-nanowires via coassembly of oppositely charged peptide-chromophore systems in aqueous media
Khalily, M. A.; Bakan, G.; Kucukoz, B.; Topal, A. E.; Karatay, A.; Yaglioglu, H. G.; Dana, A.; Güler, Mustafa O. (American Chemical Society, 2017-07)Fabrication of supramolecular electroactive materials at the nanoscale with well-defined size, shape, composition, and organization in aqueous medium is a current challenge. Herein we report construction of supramolecular ... -
Force and time-dependent self-assembly, disruption and recovery of supramolecular peptide amphiphile nanofibers
Dikecoglu, F. B.; Topal, A. E.; Ozkan A.D.; Tekin, E. D.; Tekinay, A. B.; Güler, Mustafa O.; Dana, A. (Institute of Physics Publishing, 2018)Biological feedback mechanisms exert precise control over the initiation and termination of molecular self-assembly in response to environmental stimuli, while minimizing the formation and propagation of defects through ... -
Formation of Ge nanocrystals and SiGe in PECVD grown SiNx: Ge thin films
Dana, A.; Tokay, S.; Aydınlı, Atilla (Elsevier, 2006)Formation of Ge nanocrystals in SiNx matrices has been studied using plasma enhanced chemical vapor deposition in both as deposited samples as well as in post-vacuum annealed samples. Low temperature and short duration ... -
Growth of Ge nanoparticles on SiO2 / Si interfaces during annealing of plasma enhanced chemical vapor deposited thin films
Foss, S.; Finstad, T. G.; Dana, A.; Aydınlı, Atilla (Elsevier B.V., 2007)Multilayer germanosilicate (Ge:SiO2) films have been grown by plasma enhanced chemical vapor deposition. Each Ge:SiO2 layer is separated by a pure SiO2 layer. The samples were heat treated at 900 °C for 15 and 45 min. ... -
High-refractive-index measurement with an elastromeric grating coupler
Kocabas, A.; Ay, F.; Dana, A.; Kiyat, A.; Aydınlı, Atilla (Optical Society of America, 2005)An elastomeric grating coupler fabricated by the replica molding technique is used to measure the modal indices of a silicon-on-insulator (SOI) planar waveguide structure. Because of the van der Waals interaction between ... -
Interfiber interactions alter the stiffness of gels formed by supramolecular self-assembled nanofibers
Dagdas, Y. S.; Tombuloglu, A.; Tekinay, A. B.; Dana, A.; Güler, Mustafa O. (Elsevier, 2011-02-16)Molecular self-assembly is a powerful technique for developing novel nanostructures by using noncovalent interactions such as hydrogen bonding, hydrophobic, electrostatic, metal-ligand, p-p and van der Waals interactions. ... -
Invisible thin-film patterns with strong infrared emission as an optical security feature
Bakan, G.; Ayas S.; Serhatlioglu, M.; Elbuken, Çağlar; Dana, A. (Wiley-VCH Verlag, 2018)Spectrally selective thermal emission is in high demand for thermophotovoltaics, radiative cooling, and infrared sensing applications. Spectral control of the emissivity is historically achieved by choosing the material ... -
Laser synthesized gold nanoparticles for high sensitive strain gauges
Burzhuev, S.; Dana, A.; Ortac, B. (Elsevier, 2013-12-01)We demonstrate high strain sensitivity property of gold nanoparticle (Au-NP) thin films fabricated on flexible polydimethylsiloxane (PDMS) substrates. This behavior is attributed to quantum tunneling effect that is highly ... -
License distribution protocols from optical media fingerprints
Hammouri, G.; Dana, A.; Sunar, B. (Springer International Publishing, 2010)According to the Business Software Alliance about 35% of the global software market, worth $141 Billion, is counterfeit. Most of the counterfeit software is distributed in the form of a compact disc (CD) or a digital video ... -
Local delivery of doxorubicin through supramolecular peptide amphiphile nanofiber gels
Cinar, G.; Ozdemir, A.; Hamsici, S.; Gunay, G.; Dana, A.; Tekinay, A. B.; Güler, Mustafa O. (Royal Society of Chemistry, 2017)Peptide amphiphiles (PAs) self-assemble into supramolecular nanofiber gels that provide a suitable environment for encapsulation of both hydrophobic and hydrophilic molecules. The PA gels have significant advantages for ... -
Memristive behavior in a junctionless flash memory cell
Orak, I.; Ürel, M.; Bakan, G.; Dana, A. (American Institute of Physics Inc., 2015)We report charge storage based memristive operation of a junctionless thin film flash memory cell when it is operated as a two terminal device by grounding the gate. Unlike memristors based on nanoionics, the presented ...