Now showing items 21-40 of 3832

    • Generation of cylindrical vector beams with few-mode fibers excited by Laguerre–Gaussian beams 

      Volpe, Giovanni; Petrov, D. (Elsevier, 2004-07-01)
      We propose a novel method to efficiently produce light beams with radial, azimuthal, and hybrid polarization, through a few-mode fiber excited by a Laguerre–Gaussian beam. With different input polarization we can selectively ...
    • Surface plasmon radiation forces 

      Volpe, Giovanni; Quidant, R.; Badenes, G.; Petrov, D. (The American Physical Society, 2006-06)
      We report the first experimental observation of momentum transfer from a surface plasmon to a single dielectric sphere. Using a photonic force microscope, we measure the plasmon radiation forces on different polystyrene ...
    • Torque detection using brownian fluctuations 

      Volpe, Giovanni; Petrov, D. (The American Physical Society, 2006-11-24)
      We report the statistical analysis of the movement of a submicron particle confined in a harmonic potential in the presence of a torque. The absolute value of the torque can be found from the auto- and cross-correlation ...
    • Quantitative assessment of non-conservative radiation forces in an optical trap 

      Pesce, G.; Volpe, Giovanni; De Luca, A. C.; Rusciano, G.; Volpe, G. (Institute of Physics Publishing, 2009-05)
      The forces acting on an optically trapped particle are usually assumed to be conservative. However, the presence of a non-conservative component has recently been demonstrated. Here, we propose a technique that permits one ...
    • Novel perspectives for the application of total internal reflection microscopy 

      Volpe, Giovanni; Brettschneider, T.; Helden, L.; Bechinger, C. (Optical Society of America, 2009-12)
      Total Internal Reflection Microscopy (TIRM) is a sensitive non-invasive technique to measure the interaction potentials between a colloidal particle and a wall with femtonewton resolution. The equilibrium distribution of ...
    • Influence of noise on force measurements 

      Volpe, Giovanni; Helden, L.; Brettschneider, T.; Wehr, J.; Bechinger, C. (The American Physical Society, 2010-04)
      We demonstrate how the ineluctable presence of thermal noise alters the measurement of forces acting on microscopic and nanoscopic objects. We quantify this effect exemplarily for a Brownian particle near a wall subjected ...
    • Microswimmers in patterned environments 

      Volpe, Giovanni; Buttinoni, I.; Vogt, D.; Kümmerer, H.- J.; Bechinger, C. (The Royal Society of Chemistry, 2011-07-14)
      Tiny self-propelled swimmers capable of autonomous navigation through complex environments provide appealing opportunities for localization, pick-up and delivery of microscopic and nanoscopic objects. Inspired by motile ...
    • Printed multilayer superstructures of aligned single-walled carbon nanotubes for electronic applications 

      Kang, S. J.; Kocabaş, Coşkun; Kim, H.-S.; Cao, Q.; Meitl, M. A.; Khang, D.-Y.; Rogers, J. A. (American Chemical Society, 2007-10)
      We developed means to form multilayer superstructures of large collections of single-walled carbon nanotubes (SWNTs) configured in horizontally aligned arrays, random networks, and complex geometries of arrays and networks ...
    • Molecular scale buckling mechanics in individual aligned single-wall carbon nanotubes on elastomeric substrates 

      Khang, D. -Y.; Xiao, J.; Kocabaş, Coşkun; MacLaren, S.; Banks, T.; Jiang, H.; Huang, Y. Y.; Rogers, J. A. (American Chemical Society, 2008)
      We have studied the scaling of controlled nonlinear buckling processes in materials with dimensions in the molecular range (i.e., ∼1 nm) through experimental and theoretical studies of buckling in individual single-wall ...
    • A 500 MHz carbon nanotube transistor oscillator 

      Pesetski, A. A.; Baumgardner, J. E.; Krishnaswamy, S. V.; Zhang, H.; Adam, J. D.; Kocabaş, Coşkun; Banks, T.; Rogers, J. A. (American Institute of Physics, 2008-09)
      Operation of a carbon nanotube field effect transistor (FET) oscillator at a record frequency of 500 MHz is described. The FET was fabricated using a large parallel array of single-walled nanotubes grown by chemical vapor ...
    • Alignment controlled growth of single-walled carbon nanotubes on quartz substrates 

      Xiao, J.; Dunham, S.; Liu, P.; Zhang, Y.; Kocabaş, Coşkun; Moh, L.; Huang, Y.; Hwang, K. -C.; Lu, C.; Huang, W.; Rogers, J. A. (American Chemical Society, 2009-09-11)
      Single-walled carbon nanotubes (SWNTs) possess extraordinary electrical properties, with many possible applications in electronics. Dense, horizonally aligned arrays of linearly configured SWNTs represent perhaps the most ...
    • High-frequency performance of submicrometer transistors that use aligned arrays of single-walled carbon nanotubes 

      Kocabaş, Coşkun; Dunham, S.; Cao, Q.; Cimino, K.; Ho, X.; Kim, H.-S.; Dawson, D.; Payne, J.; Stuenkel, M.; Zhang, H.; Banks, T.; Feng, M.; Rotkin, S. V.; Rogers, J. A. (American Chemical Society, 2009-04-08)
      The unique electronic properties of single-walled carbon nanotubes (SWNTs) make them promising candidates for next generation electronics, particularly in systems that demand high frequency (e.g., radio frequency, RF) ...
    • Future outlook 

      Erdem, Talha; Demir, Hilmi Volkan (Springer, 2019-01)
      In this final Chapter, we present a future perspective for the light source design. We discuss the existing problems and briefly introduce new material systems and device architectures that can overcome the current issues.
    • How to design quality light sources with discrete color components 

      Erdem, Talha; Demir, Hilmi Volkan (Springer, 2019-01)
      White light sources using discrete emitters require careful design and optimization. The first step of the design should be determining the intended use of the light source so that application specific requirements can be ...
    • Common white light sources 

      Erdem, Talha; Demir, Hilmi Volkan (Springer, 2019-01)
      In this Chapter we describe the features of common light sources. We first present the spectral features of the sun and discuss its colorimetric properties. Next, we summarize the properties of traditional light sources ...
    • Metrics for light source design 

      Erdem, Talha; Demir, Hilmi Volkan (Springer, 2019-01)
      In this part of this brief, we summarize the metrics that need to be considered for designing light sources. We start with metrics on the shade of color and then continue with color rendering and photometry.
    • Colorimetry for LED lighting 

      Erdem, Talha; Demir, Hilmi Volkan (Springer, 2019-01)
      In this Chapter, we explain the basics of colorimetry and introduce the colorimetric tools useful for designing light sources.
    • Light stimulus and human eye 

      Erdem, Talha; Demir, Hilmi Volkan (Springer, 2019-01)
      In this Chapter, we summarize the structure of the human eye and introduce the sensitivity functions of various photoreceptors and present the visual regimes and corresponding eye sensitivity functions.
    • Cucurbituril containing supramolecular nanomaterials 

      Khan, Rehan; Tuncel, Dönüş (The Royal Society of Chemistry, 2019-01)
      National Magnetic Resonance Research Center UMRAM Cucurbituril-based supramolecular nanomaterials are getting increasing attention due to their tailorable properties and functions. By making use of the host–guest chemistry ...
    • Glycosylated porphyrin-cucurbituril conjugate for photodynamic inactivation of bacteria and doxorubicin carriage for anticancer drug delivery 

      Özkan, Melis; Keser, Yağmur; Koç, Ahmet; Tuncel, Dönüş (World Scientific Publishing, 2019-10)
      Porphyrin derivatives are highly attractive in the construction of multifunctional molecular platforms with interesting properties and applications. In this regard, we report here the use of a multifunctional porphyrin-based ...