Department of Physics
Recent Submissions
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Generation of cylindrical vector beams with few-mode fibers excited by Laguerre–Gaussian beams
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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. -
Two-dimensional Bose polaron using diffusion Monte Carlo method
(World Scientific Publishing, 2019-09)We investigate the properties of a mobile impurity immersed in a two-dimensional (2D) Bose gas at zero temperature using quantum Monte Carlo (QMC) methods. The repulsive boson–boson and impurity-boson interactions are ... -
Nonequilibrium electron relaxation in graphene
(World Scientific Publishing, 2019)We apply memory function formalism to investigate nonequilibrium electron relaxation in graphene. Within the premises of two-temperature model (TTM), explicit expressions of the imaginary part of the memory function or ...
