810 research outputs found
Cellular mechanics and intracellular organization
Mechanical signals affect and regulate many aspects of the cell behaviour, including growth, differentiation, gene expression and cell death. This thesis investigates the manner by which mechanical stress perturbs the intracellular structures of the cell and induces mechanical responses. In order to correlate mechanical perturbations to cellular responses, a combined fluorescence-atomic force microscope (AFM) was used to produce well defined nanomechanical perturbations while simultaneously tracking the real-time motion of fluorescently labelled intracellular organelles in live cells.
By tracking instantaneous displacements of mitochondria far from the point of indentation, insights can be gained into the long-distance propagation of forces and the role of the cytoskeleton in force transmission. Quantitative analysis and tracking of mitochondria, using several image registration and tracking techniques, revealed an increase of approximately 40% in the mean mitochondrial displacement following AFM perturbation. Furthermore, when either the actin cytoskeleton or microtubules were disrupted using anti-cytoskeletal drugs, no significant change in mitochondrial displacement was observed following indentation, revealing the crucial role of both cytoskeletal networks in the long-distance transmission of forces through the cell.
In addition, the effect of retinol and conjugated linoleic acid (CLA), compounds that have diverse effects on various cellular processes, on the mechanical behaviour of the cell was examined: both compounds were found to have a significant detrimental effect on the formation of focal adhesions, which was directly correlated to the measured cell elasticity (Young’s modulus) of the cell. Furthermore, quantification of mitochondrial displacements in response to applied AFM perturbations showed force propagation through the cytoskeleton to be blunted. Treatment of the two compounds in combination showed an additive effect. These results may broaden our understanding of the interplay between cell mechanics and cellular contact with the external microenvironment, and help to shed light on the important role of retinoids and CLA in health and disease
Realization of quantum walks with negligible decoherence in waveguide lattices
Quantum random walks are the quantum counterpart of classical random walks, and were recently studied in the context of quantum computation. Physical implementations of quantum walks have only been made in very small scale systems severely limited by decoherence. Here we show that the propagation of photons in waveguide lattices, which have been studied extensively in recent years, are essentially an implementation of quantum walks. Since waveguide lattices are easily constructed at large scales and display negligible decoherence, they can serve as an ideal and versatile experimental playground for the study of quantum walks and quantum algorithms. We experimentally observe quantum walks in large systems (similar to 100 sites) and confirm quantum walks effects which were studied theoretically, including ballistic propagation, disorder, and boundary related effects
Effect of Nonlinearity on Adiabatic Evolution of Light
We investigate the effect of nonlinearity in a system described by an adiabatically evolving Hamiltonian. Experiments are conducted in a three-core waveguide structure that is adiabatically varying with distance, in analogy to the stimulated Raman adiabatic passage process in atomic physics. In the linear regime, the system exhibits an adiabatic power transfer between two waveguides which are not directly coupled, with negligible power recorded in the intermediate coupling waveguide. In the presence of nonlinearity the adiabatic light passage is found to critically depend on the excitation power. We show how this effect is related to the destruction of the dark state formed in this configuration
Correlated Multiphoton Holes
We generate bipartite states of light which exhibit an absence of multiphoton
coincidence events between two modes amid a constant background flux. These
`correlated photon holes' are produced by mixing a coherent state and
relatively weak spontaneous parametric down-conversion using a balanced
beamsplitter. Correlated holes with arbitrarily high photon numbers may be
obtained by adjusting the relative phase and amplitude of the inputs. We
measure states of up to five photons and verify their nonclassicality. The
scheme provides a route for observation of high-photon-number nonclassical
correlations without requiring intense quantum resources.Comment: 4 pages, 3 figures, comments are welcom
Hanbury Brown and Twiss Correlations of Anderson Localized Waves
When light waves propagate through disordered photonic lattices, they can
eventually become localized due to multiple scattering effects. Here we show
experimentally that while the evolution and localization of the photon density
distribution is similar in the two cases of diagonal and off-diagonal disorder,
the density-density correlation carries a distinct signature of the type of
disorder. We show that these differences reflect a symmetry in the spectrum and
eigenmodes that exists in off-diagonally disordered lattices but is absent in
lattices with diagonal disorder.Comment: 4 pages, 3 figures, comments welcom
All-Optical Switching with Transverse Optical Patterns
We demonstrate an all-optical switch that operates at ultra-low-light levels
and exhibits several features necessary for use in optical switching networks.
An input switching beam, wavelength , with an energy density of
photons per optical cross section [] changes
the orientation of a two-spot pattern generated via parametric instability in
warm rubidium vapor. The instability is induced with less than 1 mW of total
pump power and generates several Ws of output light. The switch is
cascadable: the device output is capable of driving multiple inputs, and
exhibits transistor-like signal-level restoration with both saturated and
intermediate response regimes. Additionally, the system requires an input power
proportional to the inverse of the response time, which suggests thermal
dissipation does not necessarily limit the practicality of optical logic
devices
Fast high-efficiency integrated waveguide photodetectors using novel hybrid vertical/butt coupling geometry
We report a novel coupling geometry for integrated waveguide photodetectors−a hybrid vertical coupling/butt coupling scheme that allows the integration of fast, efficient, photodetectors with conventional double heterostructure waveguides. It can be employed to yield a planar, or pseudo-planar, surface that supports further levels of integration. The approach is demonstrated with a 25-µm-long p-i-n detector integrated with an InP/InGaAsP/InP waveguide, which displays a high (~90%) efficiency and large (~15 GHz) bandwidth. This is the fastest high-efficiency integrated waveguide photodetector reported to date
Wireless adiabatic power transfer
We propose a technique for efficient mid-range wireless power transfer
between two coils, by adapting the process of adiabatic passage for a
coherently driven two-state quantum system to the realm of wireless energy
transfer. The proposed technique is shown to be robust to noise, resonant
constraints, and other interferences that exist in the neighborhood of the
coils.Comment: 11 pages, 6 figure
Standoff Detection of Solid Traces by Single-Beam Nonlinear Raman Spectroscopy Using Shaped Femtosecond Pulses
We demonstrate a single-beam, standoff (>10m) coherent anti-Stokes Raman
scattering spectroscopy (CARS) of various materials, including trace amounts of
explosives and nitrate samples, under ambient light conditions. The multiplex
measurement of characteristic molecular vibrations with <20cm-1 spectral
resolution is carried out using a single broadband (>550cm-1) phase-shaped
femtosecond laser pulse. We exploit the strong nonresonant background signal
for amplification of the weak backscattered resonant CARS signal by using a
homodyne detection scheme. This facilitates a simple, highly sensitive
single-beam spectroscopic technique, with a potential for hazardous materials
standoff detection applications
Parametric Self-Oscillation via Resonantly Enhanced Multiwave Mixing
We demonstrate an efficient nonlinear process in which Stokes and anti-Stokes
components are generated spontaneously in a Raman-like, near resonant media
driven by low power counter-propagating fields. Oscillation of this kind does
not require optical cavity and can be viewed as a spontaneous formation of
atomic coherence grating
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